PDF Service Manual Grove TM500E-2 Crane - 5 MB

This is the factory service manual for the Grove TM500E-2 truck-mounted crane.

It provides in-depth service and repair information, covering hydraulics, electrical systems, boom assembly, and more.

Following the procedures in this manual is critical for maintaining the operational safety and structural integrity of the crane.

It's an indispensable resource for certified crane technicians and maintenance teams.

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--- Page 1 ---
1
                                     SERVICE MANUAL
                               This Manual has been prepared for and is considered part of -


                                                    TM500E-2                                                     2
                                                    Crane Model Number


                                    This Manual is divided into the following Sections:                          3
                                        SECTION 1       INTRODUCTION
                                        SECTION 2       HYDRAULIC SYSTEM
                                        SECTION 3       ELECTRIC SYSTEM
                                        SECTION 4       BOOM
                                        SECTION 5
                                        SECTION 6
                                                        HOIST AND COUNTERWEIGHT
                                                        SWING SYSTEM
                                                                                                                 4
                                        SECTION 7       POWER TRAIN
                                        SECTION 8       UNDERCARRIAGE
                                        SECTION 9       LUBRICATION

                                                         NOTICE
                                                                                                                 5
                    The crane serial number is the only method your distributor or the factory
                    has of providing you with correct parts and service information.

                    The crane serial number is stamped on the top of the outrigger box.
                    Always furnish crane serial number when ordering parts or
                    communicating service problems with your distributor or the factory.                         6


                                                                                                                 7

                                        To prevent death or serious injury:
                                        • Avoid unsafe operation and maintenance.
                                        • This crane must be operated and maintained by trained and
                                            experienced personnel. Manitowoc is not responsible for qualifying
                                                                                                                 8
                                            these personnel.
                                        • Do not operate or work on this crane without first reading and
                                            understanding Operator’s Manual and Rating Plate supplied with
                                            crane.
                                        • Store Operator’s Manual in holder provided on crane.
                                        • Attach laminated Capacity Charts supplied with crane to chain in
                                                                                                                 9
                                            operator’s cab.
                                        • If Operator’s Manual or Capacity Charts are missing from cab,
                                            contact your distributor for new ones.

© 2006 Manitowoc Crane Group
PRELIMINARY Published 10-19-2007, Control # 151-00

--- Page 3 ---
TM500E-2 SERVICE MANUAL                                                                                                   TABLE OF CONTENTS

             Modulator Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-59
             Anti-Lock Modulator Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-59
             ATR-1 Relay Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-59
             Electronic Control Unit (ECU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-60
             ECU Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-60
             Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-62
             Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-62
             Configuration Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-62
             Pass-through Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-62
             ABS Warning Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-63
         Automatic Traction Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-64
             ATC Lamp and Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-64
             ABS Self-tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-65
                                                                                                                                                         T
             ABS Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-65
         Test and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-65                   O
             Traction Control Valve Function Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-65
             Traction Control Valve Differential Pressure Check . . . . . . . . . . . . . . . . . . . . . . . . 8-66
             Traction Control Valve Solenoid Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-66
                                                                                                                                                         C
         System Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-67
             System Schematic Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-68
             ABS System Schematic, Relays and Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . 8-69
         Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-70
             ABS Sensor Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-70
             Wheel Speed Sensor Replacement (Front) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-70
             Wheel Speed Sensor, Replacement (Rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-72
             Front Modulator Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-73
             Rear Modulator Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-74
             ATR Valve Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-75
             ABS Electronic Control Unit Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-76
         ABS Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-76
             General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-76
             General Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-76
             Data Link Instrument Cluster - Diagnostic Display . . . . . . . . . . . . . . . . . . . . . . . . . 8-77
             Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-77
             MPSI Pro-Link 9000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-77
             AL-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-77
             AL-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-77
             Readout Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-78
             Keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-78
             Push Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-78
             Installing and Removing the MPC Cartridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-78
             Non-Volatile Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-79
             MPSI Power/Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-79
             Connecting the Power/Data Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-79
             Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-79
             Application Cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-79
             Installing the Application Card: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-80
         Using the Pro-Link 9000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-80
             Bendix ABS Application Card and MPC Cartridge (with AL-7 ECU). . . . . . . . . . . . 8-80
         MPC Application Menu Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-83
             Using the Bendix ABS Cartridge (with AL-6 ECU) . . . . . . . . . . . . . . . . . . . . . . . . . 8-84
             System Testing Using the Pro-Link 9000 (AL-6). . . . . . . . . . . . . . . . . . . . . . . . . . . 8-85
             Preparing for Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-85
         ECU LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-87
             Diagnosing Faults Using the ECU LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-87
             Troubleshooting Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-88
             Component Troubleshooting Quick Reference Chart . . . . . . . . . . . . . . . . . . . . . . . 8-89


                                                                                                                                                 TOC-9

--- Page 4 ---
TM500E-2 SERVICE MANUAL                                                                                      INTRODUCTION


Hydraulic Systems                                                   1.   Visually inspect hoses and fittings once a month or
                                                                         every 250 hours for the following:                         1
                                                                         a.   Leaks at hose fitting or in hose
                                                                         b.   Damaged, cut, or abraded cover
                             DANGER
 Exercise extreme care around pressurized hydraulic                      c.   Exposed reinforcement
 systems. Do not work on a hydraulic system while it is in               d.   Kinked, crushed, flattened, or twisted hose
 operation or until all pressure is released.
                                                                         e.   Hard, stiff, heat cracked, or charred hose
Cleanliness                                                              f.   Blistered, soft, degraded, or loose cover
Contaminants in a hydraulic system affect operation and will             g.   Cracked, damaged, or badly corroded fittings
result in serious damage to the system components. Dirty
hydraulic systems are a major cause of component failures.               h.   Fitting slippage on hose
                                                                         i.   Other signs of significant deterioration
Keep the System Clean
                                                                    If any of the above conditions exist, evaluate hose
When removing components of a hydraulic system, cover all           assemblies for correction or replacement. For replacement
openings on both the component and the crane.                       of hose assemblies, refer to your Manitowoc CraneCARE
                                                                    Parts Manual.
If evidence of foreign particles is found in the hydraulic
system, flush the system.                                           2.   At the same service interval, visually inspect all other
                                                                         hydraulic components and valves for the following:
Disassemble and assemble hydraulic components on a
clean surface.                                                           a.   Leaking Ports
Clean all metal parts in a nonflammable cleaning fluid. Then             b.   Leaking valve sections or manifolds and valves
lubricate all components to aid in assembly.                                  installed into cylinders or onto motors.

Sealing Elements                                                         c.   Damaged or missing hose clamps, guard, or
                                                                              shields.
Inspect all sealing elements (O-ring, gaskets, etc.) when
                                                                         d.   Excessive dirt and debris around the hose
disassembling and assembling the hydraulic system
                                                                              assemblies.
components. Installation of new elements is always
recommended.                                                        If any of these conditions exist, address them appropriately.
                                                                    3.   All hydraulic hose assemblies are recommended to be
Hydraulic Lines
                                                                         replaced after 8000 hours of service life.
When installing metal tubes, tighten all bolts finger-tight.
                                                                    4.   Hydraulic hose assemblies operating in a temperature
Then, in order, tighten the bolts at the rigid end, the
                                                                         climate zone “C” (Table 1-1) are recommended to be
adjustable end, and the mounting brackets. After tubes are
                                                                         replaced after 8000 hours of service life.
mounted, install the hoses. Connect both ends of the hose
with all bolts finger-tight. Position the hose so it does not rub   5.   Hydraulic hose assemblies operating in climate zones
the machine or another hose and has a minimum of bending                 “A” and “B” (Table 1-1) with high ambient temperatures,
and twisting. Tighten bolts in both couplings.                           could see hose service life reduced by 40 to 50%,
                                                                         therefore, it is recommended to replace these hoses
Due to manufacturing methods there is a natural curvature to
                                                                         after 4000 to 5000 hours of service life.
a hydraulic hose. The hose should be installed so any bend
is with this curvature.                                             6.   Hydraulic hose assemblies operating in climate zones
                                                                         “D” and “E” (Table 1-1) cold climates should expect a
Visual Inspection of Hoses and Fittings                                  degrade of mechanical properties such as elasticity,
                                                                         therefore, it is recommended these hoses be inspected
                                                                         and addressed accordingly.
                         CAUTION
 Ensure that the hydraulic hose is depressurized before
 loosening the connections.


                                          PRELIMINARY Published 10-05-2007, Control # 151-00                                  1-7

--- Page 5 ---
TM500E-2 SERVICE MANUAL                                                                                    INTRODUCTION


Procedures for Cutting and Preparing                                  a.   If a welder is available, the cut should be made with
FLEX-X 35                                                                  an abrasive saw. Immediately after the cut, both           1
                                                                           ends of the rope are to be cap welded so that all
Flex-X 35 is a special wire rope that must be handled                      inner and outer strands are welded together,
differently than any other rope we manufacture. One                        preventing any movement between them.
characteristic that makes this rope special is that the outer
                                                                 NOTE:     The outer strands must not be able to move with
strands are not preformed. It is because of this that the
                                                                           respect to the inner strands. The weld must not
following procedures for cutting and preparing Flex-X 35
                                                                           exceed the diameter of the rope.
must be followed:
                                                                      b.   If a welder is not available, the cut is to be made with
1.   The welded ends prepared by the manufacturer are not
                                                                           an acetylene torch. The cut is to be made in such a
     to be removed.
                                                                           way that both ends of the rope are completely fused
2.   Before cutting the rope, make three separate bands with               so that all inner and outer strands are bonded
     seizing strand on each side of where the cut is to be                 together, preventing any movement between
     made (total of six bands for each cut). Each band is to               strands.
     have a minimum length of one and one half times the
                                                                 NOTE:     The outer strands must not be allowed to move
     rope diameter. The two bands closest to the cut should
                                                                           with respect to the inner strands. The fused end
     be located at a distance equal to one rope diameter
                                                                           must not exceed the diameter of the rope.
     away from the cut. The four remaining bands should be
     evenly spaced at a distance equal to three rope             4.   Once the cuts have been completed, the seizing bands
     diameters (Figure 1-10).                                         are to be left in place for shipment of the rope.
3.                                                               5.   Attach a “Do not remove welded ends” tag on each reel
                                                                      flange.


                                                                                  FIGURE 1-10


                                       PRELIMINARY Published 10-05-2007, Control # 151-00                                     1-17

--- Page 6 ---
TM500E-2 SERVICE MANUAL                                                                           HYDRAULIC SYSTEM

mechanism and hoist(s), because it can cause these units to           Entrapped air may be removed from cylinders having
become noisy during operation. If noisy operation occurs,             wet rods by cycling. On certain cylinders, a plugged port
first check the level of the hydraulic reservoir and replenish        is provided on the rod end to bleed off entrapped air.
as necessary. Then inspect for leaks in the suction lines
leading to the pumps.
Minute leaks may be hard to locate. If a leak is not readily
                                                                                               DANGER
detectable, use the following way to check for it:
                                                                   Pressurized fluid can cause serious injury or death. Do           2
    Seal all normal openings in the hydraulic system and the       not attempt to loosen fittings in pressurized lines or while
    reservoir. Using a positive means to control the pressure      the hydraulic pumps are in operation.
    (like a regulator), pressurize the hydraulic system to
    13.8 to 27.6 kPa (0.14 to 0.28 bar) (2 to 4 psi) and              In the event that air entrapment should persist, bleeding
    inspect all joints and fittings for evidence of leaks. A          of air by loosening various clamp and screw type fittings
    soap solution applied to the fittings and joints may also         may become necessary.
    prove helpful in detecting minute leaks while the system
    is pressurized. Remove the pressure, repair any leaks             If the above procedures fail to eliminate air entrapment,
    found, and reopen any openings (such as a vent) closed            contact your authorized Grove Distributor.
    for inspection. Refill the reservoir after completing any
    repairs or service. Operate all hydraulic circuits several    Parts Replacement
    times in both directions.                                     Parts found damaged or out of tolerance when maintenance
    This action should return any entrapped air to the            is being performed should be replaced. Refer to the
    reservoir where it can be removed from the hydraulic oil      Manitowoc CraneCARE Parts Catalog for proper
    by the baffles.                                               replacement parts.

                                                                  Directional Control Valves
                                                                  The control valves that control the crane functions are
                            DANGER                                installed on the right side on the outside of the superstructure
                      Tipping Hazard                              side plate, and between the left and right superstructure side
 To avoid death or serious injury, locate the machine on a        plates under the main hoist.
 firm supporting surface and position the boom over the
 front on outriggers when extending the boom at low               Inspection
 angles.                                                          Inspect the control valves for visible damage, binding spools,
                                                                  and evidence of leakage. If excessive internal leakage is
    To remove entrapped air from telescope cylinders, lower       suspected during operation with a spool in its center position,
    the boom to below horizontal and fully telescope the          it is possible that the area between the spool and working
    boom in and out several times.                                section bore of the valve body is worn beyond serviceable
    If the air is not readily removed, lower the boom to below    limits. If this condition exists, the spool and body must be
    horizontal, extend the telescope cylinders as far as          replaced as an assembly.
    practicable, and allow the boom to remain in this position
    overnight. This should allow entrapped air to find its way    Valve Leakage
    to the holding valve so that telescoping the boom IN the      Dripping hydraulic oil indicates some type of external
    next morning should force the air back to the reservoir.      leakage. The machine should be removed from service for
    Ensure the boom is first telescoped IN (not OUT) in the       immediate repairs. External leaks sometimes develop at
    morning. Telescoping OUT may cause air to be forced           fittings and seals. Spool seals are susceptible since they are
    back into a cylinder.                                         subject to wear. Seals may be damaged by temperatures
                                                                  that are too high, or by dirt or paint accumulation on the
                                                                  spool. Damaged or torn seals must be replaced.

                            DANGER                                A component functioning at reduced efficiency may indicate
                                                                  that the control valve for that component is leaking internally.
 Pressurized fluid can cause serious injury or death.
                                                                  If preliminary check-out reveals that adequate volume is
 Extreme care must be used when removing any plugs or
                                                                  being supplied to the affected valve bank, relief valves are
 restrictions from a hydraulic system suspected to have
                                                                  properly adjusted, and the component is not at fault, check
 entrapped air that may be pressurized.
                                                                  the valve for scored or worn parts. Scoring is a sign of the
                                                                  number one problem in hydraulics - contamination (external


                                        PRELIMINARY Published 10-5-2007, Control # 151-00                                     2-5

--- Page 7 ---
TM500E-2 SERVICE MANUAL                                                                                  HYDRAULIC SYSTEM

       d.   Increase the RPM to 1500-1800 for 1 to 2 minutes          4.     Start the engine.
            with no functions actuated and make checks again
                                                                             a.   Idle engine for two to three minutes with no
            as outlined in step a. Incrementally increase throttle
                                                                                  functions actuated. Check for leaks and repair if
            to full RPM and then cycle the functions that the
                                                                                  required. Lay hand on pump to check for excessive
            pump supples to verify proper speed. Verify pump
                                                                                  heat build-up. If the pump section is too hot to keep
            flow.
                                                                                  your hand on, stop immediately. If the pump makes
5.     Check pressure settings. Refer to PRESSURE
       SETTING PROCEDURES in this section.
                                                                                  excessive noise, air is probably entering the pump
                                                                                  keeping it from priming. If this occurs, stop engine,    2
                                                                                  and inspect all connections of the suction hose/tube
Piston Pump Start-up Procedure                                                    for a loose connection, or a missing or damaged O-
                                                                                  ring. Re-start the engine and run until the pump
1.     Ensure the reservoir is filled with the proper hydraulic                   takes prime for a maximum of 30 seconds. If the
       fluid to the high level mark on the reservoir sight gauge.                 pump does not prime in 30 seconds, stop the engine
2.     Ensure no air is entering the pump inlet, and that the                     and repeat until the pump primes.
       pump suction or inlet fluid is not bleeding back to the               b.   Increase the RPM to 1500-1800 for 1 to 2 minutes
       reservoir when the engine is stopped, by making sure all                   with no functions actuated and make checks again
       suction or inlet lines are air tight.                                      as outlined in step a. Incrementally increase throttle
3.     Remove the case drain hose and adapter from port DR                        to full RPM and then cycle the functions that the
       on the pump (Figure 2-7), and fill housing with the same                   pump supples to verify proper speed. Verify pump
       hydraulic oil that was used to fill the hydraulic reservoir                flow.
       to the bottom of the O-ring case drain port. Install the       5.     Check pressure settings. Refer to PRESSURE
       case drain adapter and hose.                                          SETTING PROCEDURES in this section.

                                                                                  3


                  2


                                                                                                                     1


                                                                                                                      4


                                                                                                            6950-1
                                                                                                                          FIGURE 2-7


     Item                   Description                                    Item                    Description
 1           No. 1 - Piston Pump                                       3              Case Drain To Reservoir
 2           No. 2 - Gear Pump                                         4              Engine


                                            PRELIMINARY Published 10-5-2007, Control # 151-00                                      2-15

--- Page 8 ---
TM500E-2 SERVICE MANUAL                                                                       HYDRAULIC SYSTEM


                                                                           1                                               2


                       3


                                                                                                           6956-3


                                                   Carrier


                                                                                    6956-1


                                            2

                                                                                                FIGURE 2-13 continued
                                  6956-2


 Item                      Description                           Item                    Description
1       Front Outrigger Control Manifold                        3        Frame
2       Rear Outrigger Control Manifold


                                     PRELIMINARY Published 10-5-2007, Control # 151-00                              2-25

--- Page 9 ---
TM500E-2 SERVICE MANUAL                                                                             HYDRAULIC SYSTEM


PILOT OPERATED CHECK VALVE                                          3.   Lubricate the check valve and O-rings with clean
                                                                         hydraulic oil.
Description
A pilot operated (PO) check valve is located in each                                          CAUTION
outrigger stabilizer cylinder port block. The check valve            Do not damage the O-rings during installation of the check
functions as a holding valve for the stabilizer cylinder. Oil        valve. If the check valve turns freely then gets hard to turn,
flow is directed from the “V” port to the “C” ports, while
blocking flow in the opposite direction. Flow is reversed from
                                                                     then easy to turn, remove the check valve and check the           2
                                                                     O-rings. They have probably been damaged by a sharp
“C” to “V” when pressure pilot oil is applied to the opposite        edge of a port.
side “V” port (Figure 2-17)
                                                                    NOTE:     The check valve should turn by hand until
Maintenance                                                                   compression of the O-rings begins.
Removal                                                             4.   Carefully install the check valve into the port block until
                                                                         fully seated.
1.   Unscrew the check valve from the stabilizer cylinder port
     block.                                                         5.   Test the check valve and port block by operating the
                                                                         affected outrigger’s stabilizer cylinder. Verify it extends
Installation                                                             and retracts without problems; verify there is no leaking.
                                                                         Make repairs as needed.
1.   Check the inside of the port block for any sharp edges or
     burrs and remove as necessary with emery cloth.
2.   Install new O-rings onto the check valve.


     Item              Description
     1          Port C - Cylinder

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