PDF Service Manual New Holland E27B Compact Hydraulic Excavator - 8 MB
This comprehensive service manual is designed for the New Holland E27B Tier 3 Compact Hydraulic Excavator.
It provides all the necessary information for maintenance, troubleshooting, and major repairs.
With this guide, technicians can efficiently diagnose issues and perform procedures to factory specifications, keeping your compact excavator operating reliably.
PDF Viewer
Viewer loads when you scroll here
SHARE THIS MANUAL
Download the PDF Manual
PDF viewer loading area
Text Preview from This Manual
The text below was extracted from the visible preview pages to help you confirm the manual contents before download.
--- Page 1 ---
SERVICE MANUAL
E27B
Tier 3
Compact Hydraulic Excavator
PIN NETN27001 and above
Part number S5HD0003E01
1st edition English
October 2014
Printed in U.S.A.
Copyright © 2014 CNH Industrial America LLC. All Rights Reserved. New Holland is a registered trademark of CNH Industrial America LLC.
Racine Wisconsin 53404 U.S.A.
--- Page 3 ---
㨇1. OUTLINE㨉
(7) Use proper tools, and replace or repair defective tools.
(8) Support the machine and attachment with supports or blocks if the work is performed in the lifted
condition.
1.1.3 DISASSEMBLING AND ASSEMBLING HYDRAULIC EQUIPMENT
(1) Removing hydraulic equipment
1. Before disconnecting pipes, release the hydraulic pressure of the system, or open the return side
cover and take out the filter.
2. Carefully drain oil of the removed pipes into a containers without spilling on the floor.
3. Apply plugs or caps on the pipe ends to avoid oil spillage and dust intrusion.
4. Clean off the external surface of the equipment before disassembling, and drain hydraulic and gear
oil before placing it on the workbench.
(2) Disassembling hydraulic equipment
1. Do not disassemble, reassemble or modify the hydraulic equipment without the permission of the
manufacturer, who is not responsible for the performance and function of the product after
modification.
2. When disassembling and reassembling for unavoidable reason, refer the work to qualified
personnel who have the specific knowledge or completed the parts service training.
3. Provide matching marks to facilitate reassembling work.
4. Before starting the work, read the manual of disassembling procedure, if it is provided, and
decide whether the work can be performed by yourself.
5. Use the special jig and tools without fail if they are specified.
6. If it is hard to remove a part according to the procedure, do not try it by force but investigate the
cause.
7. Place the removed parts in order and attach tags to facilitate the reassembling.
8. Note the location and quantity of parts commonly applied to multiple locations.
(3) Inspecting parts
1. Ensure that the disassembled parts are free from seizure, interference and uneven contact.
2. Measure and record wear condition of parts and clearance.
3. If the problem is found in a part, repair or replace it with a new one.
(4) Reassembling hydraulic equipment
1. Turn ON the ventilation fan or open windows to maintain good ventilation prior to starting the
cleaning of parts.
2. Perform rough and finish cleaning before assembling.
3. Remove washing oil by air and apply clean hydraulic or gear oil for assembling.
4. Always replace the removed O-rings, backup rings and oil seals with new ones by applying grease
in advance.
5. Remove dirt and moisture from and perform degreasing on the surface where liquid gasket to be
applied.
6. Remove rust preventive agent from the new parts before use.
7. Fit bearings, bushings and oil seals using special jigs.
8. Assemble the parts utilizing matching marks.
9. Ensure all the parts are completely assembled after the work.
1-4
--- Page 4 ---
㨇2. SPECIFICATIONS㨉
2.2 MACHINE DIMENSIONS
(1) SK28SR-6
E27B (CANOPY)
(2) SK28SR-6
E27B (CAB)
2-4
--- Page 5 ---
㨇2. SPECIFICATIONS㨉
2.8.2 ENGINE PERFORMANCE CURVE
SK28SR-6
E27B
Model : 3TNV82A-B
Rated Output : 17.1 kW / 2400 min-1 (24.8 PS / 2,400 rpm)
2-14
--- Page 6 ---
㨇3. ATTACHMENT DIMENSIONS㨉
3.2.2 ARM MAINTENANCE STANDARDS
(1) Clearance of pin and bushing
Clearance of pin and bushing on arm section
-The tolerance for bushing inside diameter means the dimension after fitting of it into place.
-The part number for pins may be changed owing to improvement, use them only for reference.
3-10
--- Page 7 ---
㨇3. ATTACHMENT DIMENSIONS㨉
3.5 SWING
3.5.1 SWING BRACKET DIMENSIONAL DRAWINGS
Swing bracket dimensional drawings
No. NAME DIMENSION [mm(in)]
A Distance between swing center pin and boom foot pin 115 (4.53)
B Distance between boom foot pin and boom cylinder pin 150 (5.91)
C - ditto - 280 (11.0)
D Distance between swing center pin and swing cylinder pin R257 (10.12)
E - ditto - 249.4 (9.82)
F Inside width of swing center 311 (12.24)
F1 - ditto - 79 (3.11)
F2 - ditto - 79.5 (3.13)
G Inside width of boom foot 178 (7.01)
H Inside width for installing boom cylinder 61 (2.40)
J Inside width for installing swing cylinder 58 (2.28)
d1 Pin dia. of swing center 60 dia.(2.36)
d2 Pin dia. of boom foot 40 dia.(1.57)
d3 Pin dia. of boom cylinder 45 dia.(1.77)
d4 Pin dia. of swing cylinder 35 dia.(1.38)
3-20
--- Page 8 ---
㨇11. TOOLS㨉
11.3 TORQUE SPECIFICATIONS FOR JOINTS AND HOSES
11.3.1 JOINTS FOR PIPING (O-RING SEALING TYPE)
11.3.2 HYDRAULIC HOSE (30 DEG. FLARE TYPE)
NOTE : The application of the tightening torque is subject to a dry condition.
11-6
--- Page 9 ---
㨇11. TOOLS㨉
11-16
--- Page 10 ---
㨇12. STANDARD MAINTENANCE TIME TABLE㨉
03 Upper structure (2/4)
WORK TO UNIT :
No. EQUIPMENT PORTION UNIT REMARKS
BE DONE HOUR
50 Hydraulic oil tank portion Refer to 33.1.11
51 Hydraulic oil tank ASSY Rem./Inst. 1 pc. 1.6
52 -Return filter Replace 1 pc. Include pressure releasing 0.2
& replacing O-ring
53 -Hydraulic oil Rem./Inst. 1 pc. 0.2
54 -Suction hose Rem./Inst. 1 pc. 0.2
55 -Strainer Replace 1 pc. Include replacing O-ring 0.1
56 -Pilot return hose Rem./Inst. 1 pc. 0.1
57 -Swivel drain hose Rem./Inst. 1 pc. 0.1
58 -SOL. valve return hose Rem./Inst. 1 pc. 0.1
59 -Swing, C / V return hose Rem./Inst. 2 pcs. 0.2
60 -Tank fixing bolt Rem./Inst. 4 pcs. 0.2
Other necessary works Rem./Inst. 1 pc. Covers 0.2
Rem./Inst. 1 pc. Control valve 1.6
Rem./Inst. 1 pc. Solenoid valve 0.1
70 Pump portion Refer to 33.1.7
71 Pump ASSY Rem./Inst. 1 pc. After removing 1.3
counterweight
72 -Hydraulic oil Replace 1 pc. Include pressure releasing 0.2
73 -Pilot delivery oil hose Rem./Inst. 1 pc. 0.1
74 -Suction hose Rem./Inst. 1 pc. 0.2
75 -Suction tube (pump side) Rem./Inst. 1 pc. 0.2
76 -Main pump delivery hose Rem./Inst. 3 pcs. 0.3
77 -Pump fixing bolt Rem./Inst. 2 pcs. 0.2
78 Pump ASSY O / H 1 pc. 3.0
Other necessary works Feed 1 pc. Hyd. oil in pump 0.1
80 Radiator portion Refer to 33.1.17
81 Radiator ASSY Rem./Inst. 1 pc. 1.3
82 -Coolant (LLC) Replace 1 pc. 0.2
83 --Coolant density Measuring 1 pc. 0.2
84 -Reserve tank hose Rem./Inst. 1 pc. 0.1
85 -Radiator hose Rem./Inst. 2 pcs. 0.2
86 -Cooler hose Rem./Inst. 2 pcs. 0.2
87 -Radiator fixing bolt Rem./Inst. 3 pcs. 0.1
88 -Radiator lifting or slinging Rem./Inst. 1 pc. 0.1
Other necessary works Rem./Inst. 1 pc. Counterweight 0.4
Rem./Inst. 1 set Covers 0.2
Rem./Inst. 1 pc. Duct 0.1
12-10
--- Page 11 ---
㨇13. MAINTENANCE STANDARD AND TEST PROCEDURE㨉
(4) Other Precautions
1. Parts with Aging Effect :
The rubber products such as hydraulic hoses, O-rings, oil seals, etc. are deteriorated with the
aging effect. It is necessary to replace them to new ones at periodical intervals or at every
overhaul.
2. Parts required Periodical Replacement :
It is recommendable to designate the important hoses critical to secure the safety as Very
Important Parts (V.I.P.), and periodically replace with new ones.
3. Inspection & Replacement of Lubricants :
It is necessary for the user of the machine to fully familiarize himself with the procedures and
precautions to handle the machine in safe and carry out the maintenance, as well as the
procedures for inspection and lubrication. Refer to the OPERATION & MAINTENANCE MANUAL
as well.
13-4
--- Page 12 ---
㨇13. MAINTENANCE STANDARD AND TEST PROCEDURE㨉
13.5.3 MOVEMENT DRIFT DUE TO GRAVITY
Measure the movement distance of machine on a slope due to machine's own weight, holding the
machine for 5 minutes on the slope.
Measuring Conditions :
࡮ Engine : Stopped
࡮ Hydraulic Oil Temp. : 50 to 60C degrees
(122 to 140F degrees)
࡮ Gradient : 15° (Approx. 1/3.73)
࡮ Machine posture : Fully extending the
boom, arm and bucket cylinders, and fully
retracting the dozer cylinder.
13.5.4 DRAIN RATE OF TRAVEL MOTOR
(1) Preparation
1. Apply stopper pins for both travel
sprockets of left and right.
2. Stop the engine, and release air in the
hydraulic oil tank.
3. Connect a hose to the drain port of travel
motor, and receive the drained oil in a
container.
4. Apply a plug to the drain piping at tank
side.
Make sure of the rotating direction of travel motor referring to the figure. Otherwise, the rib "A" may be
broken by the stopper pin.
13-14
--- Page 13 ---
㨇21. MECHATRO CONTROLLER (OPT.)㨉
Issue Date of Issue Applicable Machines Remarks
S5PX2112E01
First Edition June, 2014 SK35SR-6 : PX16-30001~
(OCE)
SK30SR-6 : PW15-50001~
(OCE)
SK35SR-6 : PX16-30001~
(SE Asia)
July, 2014 SK28SR-6 : PD03-05001~
(OCE)
21-2
--- Page 14 ---
㨇21. MECHATRO CONTROLLER (OPT.)㨉
(2) Service Diagnosis Display Screen (Example)
The following table lists the service diagnosis display screens. (These examples are for when the
engine is stopped. )
The values related to the engine controller are not displayed on the multi-display of the Tier 3
specification machines.
21-12
--- Page 15 ---
㨇21. MECHATRO CONTROLLER (OPT.)㨉
a. 70 pin connector (CN501,CN502)(3/3)
Input/
PinNo. Name Signal level Functionality
output
58 I D-IN13 Digital input 13 (EARTH/OPEN) Charge
59 I D-IN14 Digital input 14 (EARTH/OPEN) High reach (stationery)
60 I D-IN15 Digital input 15 (EARTH/OPEN) High reach (travel)
61 I D-IN16 Digital input 16 (EARTH/OPEN) Interference prevention release
Interference prevention
62 I D-IN17 Digital input 17 (EARTH/OPEN)
release switch
Interference prevention
63 I D-IN18 Digital input 18 (EARTH/OPEN)
release switch
64 I D-IN19 Digital input 19 (EARTH/OPEN)
65 O ADVCC9 5V power source for sensor 9
66 I AIN9 Analog input 9
67 AIN9_GND Analog GND
68 O ADVCC10 5V power source for sensor 10
69 I AIN10 Analog input 10
70 AIN10_GND Analog GND
21-22
--- Page 16 ---
［22. HYDRAULIC SYSTEM］
22.2.2 NIBBLER & BREAKER
SPECIFICATIONS
22-6
--- Page 17 ---
［22. HYDRAULIC SYSTEM］
22.3.4 SWING OPERATION CIRCUIT communicating with the tank.
Pilot hydraulic system operated by the control lever
22.3.4.1 SWING (LEFT) OPERATION CIRCUIT
(1) Pilot Circuit
1. Switching swing spool
When the swing (left) operation is performed, the
pilot secondary pressure is output from pilot
valve (11). The pressure oil flows to the Pb2
port of control valve (2) and switches the swing
spool.
2. Releasing parking brake
The pilot primary pressure is always conducted
to the PB port of hydraulic timer (303). When
the swing operation is performed, the pilot
secondary pressure is conducted to the PP port
of hydraulic timer (303) through shuttle valve (15)
to switch the spool. The pilot primary pressure of
3.5 MPa enters parking brake (302) to release it.
(The arm in operation also releases the swing
brake.)
3. Actuating parking brake
When the control lever is returned to neutral to
stop the swing, the pilot secondary pressure is
shut off, timer valve (303) is switched, and the
pressure oil is blocked. The oil in the brake
cylinder is pushed out by spring force and
discharged through the throttle of timer valve
(303). This actuates the brake after 3.0 to 6.0
seconds, absorbing the inertial force at swing stop
smoothly.
(2) Main Circuit
1. Supply circuit to swing motor (3)
The oil delivered from the P3 port of hydraulic
pump (1) enters the P3 port of control valve (2),
and goes through the swing valve. Then it is
supplied from the B2 port to the A port of swing
motor (3) to rotate the swing motor.
2. Swing motor (3)
a. Relief valve (304) relieves rapid pressure rise to
absorb the shock of starting or stopping the motor.
b. To avoid negative pressure being generated in the
swing motor by the inertia of the upper structure
when the swing is stopped, make-up valve
(check valve) (305) prevents cavitation by
supplying oil to the swing motor from the return
circuit [T1 and T2 ports of control valve (2)]
22-16
--- Page 18 ---
［22. HYDRAULIC SYSTEM］
22.3.9 DOZER OPERATION CIRCUIT
Pilot hydraulic system operated by the control lever
22.3.9.1 DOZER DOWN OPERATION CIRCUIT
(1) Dozer Operation
When the control lever is pushed forward, the pilot
secondary pressure is output from pilot valve (14) and
goes through the Pb1 port of control valve (2) to
switch the dozer spool.
(2) Main Circuit
1. Supply circuit to cylinder (9)
The oil delivered from the P3 port of hydraulic
pump (1) enters the P3 port of control valve (2)
and flows to the B1 port via the dozer valve.
Then, the pressure oil goes through swivel joint
(10) is supplied to the H side of dozer cylinder
(9) to actuate the dozer down operation.
22-26
--- Page 19 ---
㨇23. ELECTRICAL SYSTEM㨉
Issue Date of Issue Applicable Machines Remarks
S5PD2303E01
First Edition July, 2014 SK28SR-6 : PD03-05001~
(OCE)
23-2
--- Page 20 ---
［23. ELECTRICAL SYSTEM］
23.3.3 OPERATORS CONTROL
23.3.4 CONTROL LEVER ASSY
23-12
--- Page 21 ---
［23. ELECTRICAL SYSTEM］
23.3.10.8 HARNESS : PX13E01020P2
23-22
--- Page 22 ---
［23. ELECTRICAL SYSTEM］
23.3.11.1 FLOOR HARNESS (6/6) : PX13E01079P2
23-32
--- Page 23 ---
［23. ELECTRICAL SYSTEM］
23.3.13.1 HARNESS (3/4) : PX11E01050P3
23-42
--- Page 24 ---
［23. ELECTRICAL SYSTEM］
23.3.16.1 HARNESS : PX15E01003P2
23-52
--- Page 25 ---
㨇24. COMPONENTS SYSTEM㨉
Gear pump structure
Gear Pump
No. Name Q'ty No. Name Q'ty
1 Cover front 1 9 Bushing 4
2 Body 1 10 3-shaped gasket 4
3 Drive gear 1 11 Gasket 2
4 Driven gear 1 12 Steel ball 4
5 Body 1 13 Quenching washer 4
6 Drive gear 1 14 Hex head socket bolt 4
7 Driven gear 1 15 O-ring 1
8 Side plate 4
24-6
--- Page 26 ---
㨇24. COMPONENTS SYSTEM㨉
2. Damping mechanism
(1) In case of neutral position,
Push rod (214) is pushed up by damping spring (336) through piston (224), and holds at the
position shown in Fig. "Pilot valve-Sectional view".
(2) Where the control section is inclined from the neutral position,
By rotating the cam clockwise, the push rod on the port 1 side is pushed down, and the piston
also moves down.
Then, the oil in the damping piston chamber is discharged through the orifice, and the
simultaneously generated pressure produces damping force.
On the other hand, the push rod on the port 2 side moves up by the damping spring through the
piston.
Then, oil is sucked from the tank into the damping piston chamber through three ball check
valves. The oil outside of the piston chamber flows out through the passage leading to port T on
the casing top end.
Operation when the lever is stroked from the neutral position
24-16
--- Page 27 ---
㨇24. COMPONENTS SYSTEM㨉
Hydraulic oil flow in neutral
24-26
--- Page 28 ---
㨇24. COMPONENTS SYSTEM㨉
2. Left swing operation
Explanation starts from a condition in which the spool is pushed in.
Since the P2 side Bypass Passage is shut off at the Boom Swing Comp. after the Boom Swing
Spool changeover, the oil flowed from P2 port through the P2 side Parallel Passage flows into B5 port
through the Load Check Valve in the Boom Swing Comp. and the Bridge Passage since B5 port and
the Bridge Passage have been opened after the Spool changeover and then into the Head side of
the Boom Swing Cylinder.
On the other hand, the oil returned from the Rod side of the Boom Swing Cylinder flows into A5 port
to theTank Passage that has opened with the Spool's notch after the Spool changeover.
Then, the Boom Swing Cylinder extends to swing the attachment left.
Left swing operation
24-36
--- Page 29 ---
㨇24. COMPONENTS SYSTEM㨉
2. Overload relief valve operation (1)
a. Pressure oil flows through the inside of the Piston built in the Pressure Regulating Valve
(Popet-Main V')and the Orifice B and then into the internal A Chamber until it is filled up. The
filled up pressure causes both of the Pressure Regulating Valve and Socket and the Socket and
Body Seat to be seated surely.
b. When the oil pressure at port P increases up to the setting pressure of Regulating Valve Spring,
the pressure oil is applied to the Regulating Valve via the Piston to open the Regulating Valve.
Then, thepressure oil flows through a passage in the direction of Piston inside Orifice B A
Chamber Circular Orifice C Drill Hole D and the external of Socket and then into the Tank
Passage.
c. Since the pressure inside the A Chamber decreases when the Regulating Valve is opened, which
causes the Pressure Regulating Valve to open to let the pressure oil at port P flows into the Tank
Passage throughDrill Hole E.
d. Also, since the Regulating Valve is pressed to the Seat by Regulating Valve Spring when the
pressure atport P decreases below the setting pressure of Regulating Valve Spring, the pressure
inside A Chamber becomes the same as the pressure at port P to cause the Pressure
Regulating Valve to be pressed to theSeat, resulting in the original condition (a)
24-46
--- Page 30 ---
㨇24. COMPONENTS SYSTEM㨉
3. Action of hydraulic parking brake (P/B) timer
When the parking brake operates as the
upper structure produces inertia, the
hydraulic parking brake timer operates to
delay the operation of the parking brake for
a certain time length.
a. When the parking brake is released ;
If the pressure flows into the brake
release command secondary pilot pressure
port (PP), it overcomes the force of spring
(505) and pushes spool (502) to the
positions in Fig. "Operation of hydraulic
parking brake timer" and in the figure. On
that occasion, the brake release pressure at
the brake releasing primary pressure port
(PB) passes through the arrow in Fig.
"Operation of hydraulic parking brake
timer" is flowed into the chamber of the
parking brake piston, and releases the
parking brake.
b. When the parking brake acts ;
If the pilot pressure at the brake releasing
command secondary pilot pressure port
(PP) is blocked, spool (502) is pushed back
Operation of hydraulic parking brake timer
to the position in the figure by the force
of spring (505). The brake release
pressure at the brake releasing pressure
port (PB) is blocked by spool (502) and
block the pressure supply to the chamber
of the parking brake piston. The pressure
of the parking brake piston chamber is
pushed out by the force of the spring in
the parking brake and flows out to the DR
port through the passage indicated by an
arrow in the figure : On that occasion, the
oil that is flowing out is regulated by the
orifice of piston (503), flows out to the DR
port slowly, and delays the action of the
parking brake for a certain time length.
24-56
--- Page 31 ---
㨇24. COMPONENTS SYSTEM㨉
24.1.6.5.3 HYDRAULIC VALVE
(1) Counterbalance Valve
The pressure oil from the port A presses and opens check valve (3) to inflow to the port A' on
the inlet side of the hydraulic motor. Also, the pressure oil inflows to the D room through the
choke hole C and exceed spring (4) force to move spool valve (2) to the right. This makes the
hydraulic motor return oil inflow from the port B' and return to the port B through the opening E of
body (1) and spool valve (2) to rotate the hydraulic motor. When the pressure oil is provided
from the port B, the each of above-mentioned parts operate reversely and the hydraulic motor
rotates reversely. Then, when the pressure oil of the port A is blocked, spool valve (2) moved to
the right begins to move back to the left by the spring (4) force. At this time, the oil in the D
room controls the speed of spool valve (2) moving back to the left by the throttle of the choke
hole C. The hydraulic motor still rotates due to the inertial force even though the pressure oil from
the port A is blocked. At this time, the switching speed and notch of spool valve (2) controls the
return oil gradually to stop the hydraulic motor smoothly.
24-66
--- Page 32 ---
㨇24. COMPONENTS SYSTEM㨉
(5) Dozer cylinder
Construction
ĂŞ NAME Q'TY ĂŞ NAME Q'TY ĂŞ NAME Q'TY
1 Tube assy 1 3-6 Back-up ring 1 5-2 Joint 1
1-8 Pin bushing 1 3-7 O-ring 1 5-3 Joint 1
2 Rod assy 1 4 Piston COMP 1 6 Plug COMP 1
2-3 Pin bushing 1 4-1 Piston 1 6-1 Plug 1
3 Cylinder Head COMP 1 4-2 Seal ring assy 1 6-2 O-ring 1
3-1 Cylinder head 1 4-3 Slide ring 2 6-3 Upset bolt 1
3-2 Bushing 1 4-4 Set screw 1 6-4 Pipe holder 1
3-3 U-ring 1 4-5 Steel ball 1 7 Dust seal 4
3-4 Wiper ring 1 5 Tube assy 1 8 Grease nipple 1
3-5 O-ring 1 5-1 Tube 1 9 Grease nipple 1
24-76
--- Page 33 ---
㨇24. COMPONENTS SYSTEM㨉
24-86
--- Page 34 ---
㨇24. COMPONENTS SYSTEM㨉
24-96
--- Page 35 ---
㨇25. AIR-CONDITIONER SYSTEM㨉
(2) RECEIVER DRYER
Receiver dryer
25-8
--- Page 36 ---
㨇25. AIR-CONDITIONER SYSTEM㨉
(5) TEMPERATURE ADJUSTMENT SWITCH (THERMOSTATIC VOLUME)
Rotating the knob changes the on/off point of
the compressor and the aperture of the warm
water valve, and that adjust the air
temperature from the evaporator or heater core
and thus adjust the outlet air temperature from
the air conditioning unit.
INSPECTION OF TEMPERATURE ADJUSTMENT SWITCH
25-18
--- Page 37 ---
㨇25. AIR-CONDITIONER SYSTEM㨉
(3) BLOWER MOTOR DOES NOT ROTATE
1. If the blower motor has an obvious failure, inspect it first.
2. After repairing, be sure to connect the connectors which were removed for inspection.
25-28
--- Page 38 ---
㨇32. ATTACHMENTS㨉
32.1.2 BUCKET
32.1.2.1 REMOVING BUCKET
(1) Operate the control lever to lower the
bucket to the ground to avoid load on the
connecting pins between the bucket and
arm.
(2) Move O-ring (3) to the bucket boss side
using a spatula.
Lowering bucket to ground
(3) Remove ring (2) and pin (1) with a
flat-head screwdriver to remove pin (K)
between the arm and bucket.
-If it is difficult to remove the pin, it is
because a load is applied to it. Operate the
control lever to adjust the bucket position.
-Be careful not to damage the dust seal
between the arm and bucket boss.
(4) Operate the control lever so as to release
a load on pin (J) between the bucket link
and bucket.
(5) Remove ring (2) and pin (1) and remove
pin (J).
(6) Remove the bucket assy.
Bucket assy mass:
76kg (168 lbs)
Pin mounting area (cross section A-A)
32-4
--- Page 39 ---
㨇32. ATTACHMENTS㨉
32.1.6 BOOM SWING
32.1.6.1 PREPARATION FOR REMOVAL/INSTALLATION
(1) Boom swing the machine left by about 30 degrees to improve the workability.
(2) Remove the cylinder hoses of the bucket, arm and boom, and plug their connection ports.
Tools: Wrench: 19, 22, 27mm
32.1.6.2 REMOVING BOOM SWING BRACKET AND CYLINDER
(1) Removing boom swing bracket (A9)
1. Remove retaining sems bolt (C5) of rod
side pin (M) of boom swing cylinder (C11),
and then remove pin (M).
Tools: Socket: 17mm
2. Attach and retain boom foot pin (A) to the
original position of boom swing bracket
(A9), and then lift the boom swing bracket
temporarily.
3. Remove retaining capscrews (B8) and (B9)
of boom swing center pins (L1) and (L2),
and then remove pins (L1) and (L2).
Tools: Socket: 17, 19mm
4. Remove boom swing bracket (A9).
Boom swing bracket mass: 69kg (152 lbs)
(2) Removing boom swing cylinder (C11)
1. Remove the two boom swing cylinder
connection hoses.
Tools: Wrench: 19, 22mm
2. Remove retaining capscrew (C5) of head
side pin (N) of boom swing cylinder, and
then remove pin (N).
Tools: Socket: 19mm
3. Take out boom swing cylinder (C11) from
the front.
Boom swing cylinder mass: 28kg (62 lbs)
Boom swing
32-14
--- Page 40 ---
㨇32. ATTACHMENTS㨉
2. Installing U-Ring
Install the U-ring (6).
Installing U-ring
3. Assembling holder (Only for boom cylinder)
a. Install spacer (12).
b. Install cushion seal (13).
c. Install collar (14).
d. Install back-up ring (16) and O-ring (8).
Installing holder
4. Using the setting tool, install the wiper ring
(7).
Installing wiper ring
5. Install the back-up ring (9) and O-rings (8)
and (10).
Installing back-up ring and O-ring
32-24
--- Page 41 ---
㨇32. ATTACHMENTS㨉
32-34
--- Page 42 ---
㨇33. UPPER STRUCTURE㨉
33.1.3 FLOOR PLATE ASSEMBLY
The travel pilot valve assembly and boom swing foot pedal are integrated with the floor plate. They
have to be removed/installed together.
33.1.3.1 PREPARATION FOR REMOVAL OF FLOOR PLATE ASSEMBLY
(1) Remove floor mats (3) and (4).
(See Paragraph 33.1.1)
(2) Remove the canopy or cab.
(See Paragraph 33.1.1)
(3) Remove six sems bolts (5) M8 x 20 and floor plate (2).
Tools: Socket: 13mm
(4) Separate the electric wiring for the travel speed select switch at the connector part.
If the machine is equipped with the travel alarm, remove the four pressure switch connectors
attached to the travel pilot valve.
Canopy
Removing floor plate
33-10
--- Page 43 ---
㨇33. UPPER STRUCTURE㨉
(2) Removing cable
1.
Remove pin (9) and then pin (8).
2.
Disconnect boom swing cable (6).
Removal/installation of cable
(3) Removing the control valve
1.
Loosen four sems bolts (A4) M10 x 35 and
remove control valve (A1) in combination
with bracket (A2).
Tools: Socket: 17mm
Mass of removed part: Approximately 30kg
(66 lbs)
2.
Loosen three sems bolts (A3) M10 x 25
and remove control valve (A1).
Tools: Socket: 17mm
Mass: Approximately 25kg (55 lbs)
Removal/installation of control valve
33-20
--- Page 44 ---
㨇33. UPPER STRUCTURE㨉
33.1.14 MUFFLER
33.1.14.1 PREPARATION FOR REMOVAL
(1) Remove the guards which need to be removed to remove the muffler. (See Paragraph 33.1.2)
(2) Remove the counterweight. (See Paragraph 33.1.6)
33.1.14.2 REMOVAL