PDF Maintenance & Operation Manual CAT Bucyrus Marion M3 Blasthole Drill - 2 MB
This comprehensive manual covers both the maintenance and operation of the CAT Bucyrus Marion M3 Blasthole Drill.
It is an essential guide for operators and service personnel to ensure the machine runs efficiently and safely.
The manual details all operational controls, safety procedures, and scheduled maintenance tasks.
Adherence to these factory instructions is crucial for maximizing the drill's productivity and service life in demanding mining environments.
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BI005959
© Bucyrus
All Rights Reserved
BUCYRUS R
Technical Manual
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BI005959
PREVENTIVE MAINTENANCE
Machine downtime is costly to owners in lost ore production. All mechanical or electrical
components and devices will eventually stop. The task of identifying when this machine
shut down cou Id occur is the purpose of preventive maintenance.
A WARNING: Do not perform inspection activities while machine is in Operation.
Due to variations in operational wear rates of machine components and machine application
conditions, component life cycles are different. A.scheduled program of machine inspection
with accurate record keeping can identify machine component and their rates of wear.
A continuous careful inspection routine can spot unusual conditions or fatiguing compo-
nents before a failure occurs. Maintenance, repair and component replacement schedules
should conform to scheduled machine shutdowns. If during daily, weekly or monthly in·
spection routines any part shows wear or distortion beyond expected normal patterns re-
place them with genuine Marion parts at the next scheduled maintenance interval. The cost
of parts is small when compared to unscheduled breakdowns with their resulting lost man-
hours and machine production.
Machines which operate 24 hours, 7 days per week should have a scheduled 8-hour preven-
tive maintenance period each 7-day period. See Section 10 for recommended inspection
schedules.
Preventive maintenance inspection procedures listed below are suggested as an example of
specific typical inspection activities. Each owner should establish his own preventive main-
tenance inspection schedule based on machine application conditions and production cycle.
A
WARNING: Maintenance and operating personnel should be aware of mechani-
cal, hydraulic and electrical hazards inherent in servicing this machine.
INSPECTION CHECKLIST
Check condition of roller chain and chain sprockets
Test all hold down bolts with impact wrenches
Check crawler shoes, load rollers and shoe sprocket for wear
Inspect steel structures for cracks
Check auto-lube system for loose or damaged fittings and injector conditions
Inspect rotary gear box alignment in hoist and pull down
DANGER: Remove electrical power from machine whenever inspection of
A electrical components is performed. Use extreme care in removing
guards and protective devices.
1-6
--- Page 4 ---
BI005959
12. TEST - Push button to test the lights on the annnunciator. See Annunciator Panel for
detail.
13. RESET - Push button to reset the lights on the annunciator panel. See Annunciator
Panel.
14. PSI OR BIT LOAD - In DRILL MODE ONLY; move toggle switch up (PSI) for
hydraulic system pressure (PSI) in hoist on item 18 and pun down on item 19. Move
switch down (Bit Load) to read on item 19 actual weight on drill bit in pounds.
NOTE: Readouts can be obtained in English or Metric by the position of the top to~e
switch located on the enclosed panel above.
15. INITIAL - This push button establishes base "a" on Hole Depth readout (item 8).
Press this button AFTER the depth (of hole) is determined on item 16 and drill bit at
ground line.
16. HOLE DePTH - Adjustable indicator to set depth of hole to be drilled. Functional
only in automatic dri 1\ mode.
17. ALARM - An On/Off toggle switch to silence the depth beeper item 21.
18. HOIST LH. CRAWLER - Indicates hydraulic pressure in the hoist direction OR pres-
sure to the left hand crawler propel motor depending on the machine mode.
19. PULL DOWN R.H. CRAWLER - Indicates hydraulic pressure in the pull down direc-
tion OR pressure to right hand crawler propel motor if machine is in propel mode.
20. WARN ING - This buzzer alerts the operator of a malfunction on the Annunciator
Panel. Silence by depressing the ACK button.
21. DEPTH - This beeper sounds when the drill bit reaches the hole depth set on the Hole
Depth indicator (item 16).
22. PROPEL - Red light indicates that the machine is in the propel mode and the Propel
Control station is energized with item 23 in the propel mode.
23. HOIST/STANDBY/PROPEL SWITCH - This selector switch determines the drilling-or---- -..- - - -
propel mode, sets hoist brakes and energizes or de-energizes the leveling system.
PROPEL/LEVELING SET. This position automatically sets hoist brakes, deactivates
the levers on the drilling control station and actuat")s the Propel Control Station.
2-4
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BI005959
STARTING PANEL is located on the end of the A.C. cabinet (inside machinery house) and
is used by the operator for start-up and shut down of the machine.
•
NOTE: Se. Start·up and Shut Down
for operation of this panel.
-
64. VOLTMETER - A.C. voltage of the transformer secondary. Normal voltage is 480 V.
65. PHASE SEaU ENCE - Lamp will light when incoming A.C. power (trail cable) has
correct phase rotation. This light must be on before starting the machine.
66. ELAPSED TIME METER - Indicates the operating hours of the hydraulic system.
67. HOUSE FILTER FAN - Start and stop push buttons for the machinery house filter
system.
68. HYDRAULIC PUMP - Start and stop push buttons for the motor that drive the
hydraulic pumps.
69. MAIN AIR COMPRESSOR - Start and stop push buttons controls for the drill air
compressor.
70. EM. ST. - Emergency stop push button will shut down all systems except diesel
engine for diesel operated machines.
2-14
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BI005959
MACHINE LEVELING uses the hydraulic jacks, controlled by levers in cab, mounted on the
machinery frame in conjunction with the spirit levels mounted on the Drilling Control
Station.
One jack (second jack optional) mounts at front and one jack at each side of the drill table.
On a four jack machine, one control lever operates the front jacks as though only one
existed.
REQUIRED METHOD OF LEVELING begins by extending (lowering) both REAR jacks
until the rear of machine is slightly higher than front of machine as indicated by the level.
NOTE: The level and hydraulic pressure gauges should be watched throughout this operation.
With this accomplished, LATERALLY LEVEL the machine by extending (lowering) the
rear jack on low side until the level indicates lateral leveling. Now, extend front jack(s)
until machine levels front to rear.
A. CAUTION: Never raise machine with front jack(s) when the mast is in the
~ lowered position.
Once machine is level and the jack(s) control lever is returned to neutral position, hydraulic
valves hold the machine in position.
If machine does not remain level (assuming ground does not yield), check for leaks at
cylinders.
A WARNING: Leveling of machine must be completed before starting the drilling
operation.
RETRACTING JACK - Reverse the above operation to lower machine. The front jack(s)
MUST ALWAYS be retracted first.
ASSEMBLY OF DRILL STRING after mast is raised and machine is level, place hoist brake
switch at Release position and mode switch at Manual. Hoist gear box high enough to clear
top of stem that is in rack. Then set the brake.
Next, place the deck bushing over the upper end of the stabilizer. Screw the lifting bail
onto the stabilizer and attach the winch line to lifting bail, lift the assembly and lower it
into position in drill table opening until the deck bushing seats. Engage the stabilizer with
the stem locks by moving the lock lever to the hold position. Remove the winch line and _
lifting bail from the stabilizer. Lubricate the threads of the stabilizer with a good quality
drill piJ:e thread lubricant.
2-24
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BI005959
CRAWLER TRACKS on each side frame
consists of forty (40) separate shoes.
The shoes interconnect with two, hard-
ened steel pins, each locked in place by
a bolt thru the shoe web. Every third
shoe is a cleated type.
Periodically check shoe pin(s) lock bolts.
Replace missing bolts at once. Propel-
ling without lock bolts causes the shoe
pins to work out and separates the track.
ADJUST TRACK tension by moving
the front roller assembly forward to
tighten or to rear to loosen.
The crawler is in proper adjustment when the bottom of track is straight and tight, with
six to eight inches of sag in top strand between front roller and center support roller. A
crawler too tight causes loss of power. A loose crawler track results in serious damage as it
may climb the drive sprocket.
The front roller mounts on two adjusting blocks fitted into rectangular openings at each side
of the crawler side frame. Two shoulder pins install thru the adjusting blocks and roller
shaft and extend thru rear wall of openings. These pins lock roller assembly in place and
facilitate moving assembly for adjustment.
Two (2) hydraulic jacks are required to make the crawler track adjustment.
Remove the cover plate from each side of crawler side frame. Place hydraulic jacks, one at
each side, in space behind front roller adjusting block and against shoulder pin. Operate
jack enough to release shims and remove ALL shims. Now blocks freely move forward or
to rear.
IMPORTANT: Move both roller shaft ends at SAME time and SAME amount to keep roller
shaft at right angles to crawler side frame.
Move adjusting block (fiont roller assembly) forward by operating hydraulic jacks. If
weight of tracks will not move roller assembly to rear when jacks are retracted; carefully
propel machine back and forth until block. releases.
3-3
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BI005959
Stem Lock
Upper Stem Rack
Mast
nn
J, /
iW'
!!~ ~/
I i
3-13
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BI005959
TROUBLESHOOTING (Insufficient hood control) cont.
CAUSE: Closed air passages.
REMEDY: Clogged duets, closed dampers or closed gates will shut off the air flow.
IDENTIFICATION: Fabric bag problems.
CAUSE: Over temperature.
REMEDY: Operating temperature should not exceed 180 degrees F. (82 degrees C.).
CAUSE: HumidiW.
REMEDY: Humidity. can blind bags. Moisture will cause the collected dust to become
muddy or cement to the bag. Drawing dry air thru collector may dry the dust
enough to allow the collector to clean with the fan off. If this doesn't work
the bags must be dry cleaned or new bags installed.
CAUSE: Dust characteristics.
REMEDY: Each bag material is selected for specific physical and chemical characteristics
which are compatible with the gas stream composition and temperature.
CAUSE: Dust build-up hoppers.
REMEDY: Dust build-up into the bag area will result in excessive abrasion on the bags.
The build-up may be caused by a malfunction of the discharge device or con-
densati.9n in the hopper. A vibrator or hopper heater with insulation may have
to be added to the hoppers.
CAUSE: Bag wear on the inside.
REMEDY: Dust on clean side of bags will wear the bags out from ,inside. This could be
the result of a broken bag or incorrect bag installation or an improper tube
sheet seal. Vacuum the clean air side, replace the bag, correct the seal and re-
seal the cartridge. Do not blow dirt inside the bags. If the bags have dust in-
side them, vacuum them out.
3-23
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BI005959
BREAKOUT TONG CIRCUIT consists of a double acting cylinder capable of operating
at full system pressure when loosening the stem threaded joints.
Lock
A B ~ STEM RACK CIRCUIT, Typical
all Racks - A double acting cylin-
der actuates each stem rack assem-
bly. A counterbalance valve with
check bypass is in the raising line
to cylinder. This valve is pressure
released at 1000 psi (6895 kPa)
from the lowering line or 3000 psi
(20685 kPa) from the head end of
the cylinder, due to a 3 to 1 pilot
ratio. The oil is held in the cylin-
der (anchor end) until lowering
pressure exceeds 1000 psi (6895
I
Stem Rack I kPa), or head end pressure exceeds
Cylinder
I
I
I•
3000 psi (20685 kPa). The safety
lock cylinder is piped parallel to
L ~ the actuating cylinder.
A B
...
STEM LOCK CIRCUIT consists
of two, double acting cylinders
operating with full system pressure.
r
l-Lock..-l
MAST RAISING AND LOWERING CYLINDERS - The mast is raised and lowered by two,
double acting cylinders connected in parallel. A counterbalance valve in the lowering line
holds the oil in cylinder rod end until the 1000 psi (6895 kPa) pilot pressure from the
raising line releases the valve. The circuit bypasses the counterbalance valve thru a check
valve.
At the base of each cylinder is a sequence valve. These two valves hold the oil in the head
end of the cylinder until pilot pressure of 100 psi from the lowering line releases the valve.
Adjust BOTH valves the same. The raising circuit bypasses these valve thru a check valve.
4-6
--- Page 11 ---
BI005959
Do not break container seal until ready for use.
Before transferring fluid from shipping container into hydraulic system reservoir, cycle fluid
thru transfer pump and filter and return to shipping container. This purges pump and hoses.
Never use galvanized container to transport hydraulic fluid. Certain fluid additives react
with the zinc and forms a soapy compound.
Not all contaminates are introduced into hydraulic system from an external source. The
chemical reaction between fluid and system interior surfaces, metal particles from worn
parts or gasket fragments, packing or sealing compounds, also playa part. Oxidation, poly-
merzation or condensation reaction results in an insoluble gum, sludge or varnish. These
things result in sluggish action, reduce clearance to the point of plugging passages or ports.
Filter solid particles from system using a 10 micron filter element.
CHANGE SCHEDULE FOR HYDRAULIC FLUID - The frequency to drain hydraulic oil
and replace with new oil, depends on the oil nature and operating conditions. It is difficult
to establish a drain schedule to apply categorically to all machines.
Visual oil inspection notes any change in appearance, such as darkening or thickening serves
as a rough guide to indicate when change is imminent.
Periodic oil testing is the best determination for replacing oil. With laboratory facilities un-
available, the oil supplier usually provides this service. Change oil when characteristics, such
as viscosity and acidic properties change at an accelerated rate. If oil is changed at a proper
interval, the system remains relatively clean. If oil remains in the machine, the system clean-
ing and flushing process is expensive and time consuming.
Take sample from initial (start up) hydraulic oil after first 500 operational hours and submit
to a laboratory for evaluation; thereafter, take oil samples from main pump case drain after
every 1,200 hours of operation. Have the samples checked for particle contamination and
chemical properties. If the particle count is not excessive and the chemical properties meet
the HDF spec., then leave oil in.
Fluid leaks and seepage is inherent with high pressure hydraulic systems. Internal leakage
within components returns to reservoir thru drain lines. Careful installation of fittings and
joints keeps seepage to a minimum. All replacement parts, including hose, tubing and fit-
tings, must be in mint condition. Install hoses and tubing so no mechanical strain on the
parts exists. Use tube benders to prevent short radii bends that kink or reduce tube dia-
meter. Use proper tools to install fittings. Tighten fittings, but NOT to point of part
damage or distortion. Do not use tube or hoses of smaller diameter than original or parts
4-16
--- Page 12 ---
BI005959
AUXILIARY SYSTEM WILL NOT BUILD PRESSURE
No No No
- Plug UMito
Stem Latches
P,..ure Screw Pump
Relief a" the
WfIV In
PrtlSlUre PI~Pump
Relief Tank
Line
~
P~re P.....re PretlUre
Chedc Prnaure
Reducing Valve Goto2 Change
Setti~ and Pump
Plumbing ~.Iief
No No
Pressure Sc:rew Main Pressure SCrew Main
Change Relief ValYl Relief Valve
Pump Bank No.2 Bank No.1 ~
in all the .".., in all the way
I I
P.....ure
~
Back Pump BlICk No.1
2 - Relief
Set Up
Screw all
3 Relief
down fully
Relief to
2700",1
118.8MPa)
Relief 10
2600 psi
117.9 MPa)
~
---"
I!ack No. 2
Relief to
2500 psi ~
117.2 MPel
NOTE: If No. 1 and 2 Relief do not consistently hold set pressure, replace cartridge.
4-26
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BI005959
MINOR REPAIRS, VARIABLE DISPLACEMENT PUMP
The areas of repair indicated may be serviced, following the procedures in this manual,
without voiding the warranty.
Installation torque values for cap screws and other parts are given in the table found later
in this section.
DISPLACEMENT
CONTROL
CHARGE RELIEF
VALVE FOR
NEUTRAL
INPUT SHAFT
SEAL
____----~HARGEPUMP
CHARGE CHECK
\ VALVES (UNDER
CHARGE PUMP)
DRAIN paR
GAUGE PORT FOR
CHARGE PRESSURE
IN NEUTRAL, FORWARD
AND REVERSE
4-36
--- Page 14 ---
BI005959
RADIAL PISTON HYDRAULIC MOTOR - All four hydraulic motors used on the drill
are identical.
NOTE: Stripping and assembly of the unit is work which should not normally be attempted
by the operator unless circumstances dictate otherwise. Claims under guarantee cannot
normally be entertained if the unit in question has been stripped by the operator.
The normal overhaul period is based on the anti-friction bearing life. If the unit fai Is or
otherwise gives unsatisfactory service, replace at once with standby unit and return to
manufacturer for repair and overhaul.
During scheduled maintenance, tighten all loose bolts.
Fill any unit held in storage with oil, block off ports and protect from corrosion.
Before REMOVING HYDRAULIC MOTOR, clean complete areas next to ports and drains.
Remove pipes. Cover pipes and ports to prevent dirt entrance.
Clean motor completely, and transport to clean work area. Drain all-hydraulic fluid before
disassembly.
REMOVE MOTOR BRAKE by supporting unit with shaft pointing upward on bench. Re-
move actuator and release brake.
Remove the nuts holding brake to motor, then lift brake unit off motor.
VALVE ASSEMBLY REMOVAL AND DISASSEMBLY begins by supporting motor with
drive shaft pointing straight down. Remove cap screws bolting valve housing to motor case.
Take off valve assembly with care to prevent damage of Oldham coupling, (it may fall off).
Remove Oldham coupling and any shim(s) next to rear bearing. NOTE: Some motors have
shim(s) at rear, others at front bearing plate or front cover.
Remove cap screws from valve housing at end and pull out end cap.
4-46
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BI005959
11. To remove bottom pressure plate, insert expandable bearing puller in shaft bore of
plate. See Fig. 6. Apply a light back and forth motion on the puller to dislodge plate.
After plate has been dislodged, lift it straight up out of gear bores. If bearing puller is
not available, grind a screvvdriver-type flat on the short end of Allen wrench. Insert
Allen wrench in shaft bore
and lift plate up slightly,
moving the wrench from
one bore to the other until
plate has been dislodged.
Once plate has been dis-
lodged it should slide free-
ly out of gear bore. Use
extreme care in removing
the plate. DO NOT pry or
force out.
12. Remove the ring retainer,
O-ring, back-up ring and
isolation plate. See Fig. 7.
13. Wash all pump parts thoroughly with clean solvent and blow dry. This should remove
any foreign material collected in pump. Layout parts in disassembled order.
14. Visually inspect all parts. If any of the internal parts show excessive wear, replace all
the parts.
A. Measure the depth of the gear track. If the track is less than .615 inch (.381 mm~
the body is all right for assembly, provided it is not cracked or damaged otherwise.
B. Examine the pressure plates. They should not show excessive wear on the bronze
side. If deep curved wear marks are visible, reject them.
C. Examine the gears. If excessive wear is visible on the journals, sides or face ofthe
gears or at the point where it rotates in the seal, reject them.
ASSEMBLY INSTRUCTIONS:
15. After all parts have been inspected, wash parts once more in clean solvent and blow
dry.
16. Place pump body on workbench, (See Fig. 8), with discharge port facing you.
4-56
--- Page 17 ---
BI005959
LEGEND NOTE:
1Ui.L. tllt 3Z .. JOO 10"' 1100 C,,,
CO ESSO.. IS SHOWN 0"'.
~COOLI•• OIL
---_---\.UH
--t>---Afllt SUPPLY
---..-eo_ntoL A.R
orlCHMtGE
""ESSUlltÂŁ
.....ÂŁ
r--------~---------~-------------~-------------- ..----
r-~llIQ ------r-..'1-------~-rrl_-.,
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'......
IHUTTl'ftST"T
,,
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OIL STO"
VALVE
DRILbING AIR COMPRESSOR
DRlbblNG AIR. CONTROl.. AIR. bUBE. <$. COObiNG OIL
SCHEMATIC
--- Page 18 ---
BI005959
SULLAIR SERIES 32 - SPECIFICATIONS
DIMENSIONAL:
Cooling Model Series Length Width Height Weight
in mm in mm in mm Ib kg
Air 32-3OOL HP 109 2769 84 2133 79 2006
(Remote)
COMPRESSOR:
Type Rotary Screw
Maximum Operating Pressure 60 PSI (L) (413 kPa) (Unload Pressure)
Bearing Type Anti-F riction
Ambient Temperature (Max) 105 degrees F. (40 degrees C.)
Cooling Pressurized Oil
Lubricant See Lubrication Guide below
Sump Capacity 65 Gallons (246 Liters)
Control Pneumatic
MOTOR:
Type Open Dripproof, 460 V, AC, Three Phase, 60 Cycles, 40
degrees C. (104 degrees F.) Max. Ambient Temperature
Size 300 HP (224 kw)
Speed 1800 RPM
LUBRICATION GUIDE - COMPRESSOR
Compressor oil should conform to the following specifications:
Ambient Temperature -23 degrees C. to 32 degrees C.
-10 degrees F. to 90 degrees F.
1,000 HR MIL-L-2104B
"Normal" oil (API CC)
change period. API SE, CO
SAE10W
Dexron II ATF
D-A Torque Fluid
5-10
--- Page 19 ---
BI005959
ELEMENT INSPECTION
1. Place a bright light inside the element to inspect for damage or leak holes. Concentrated
light will shine thru the element and disclose any holes.
2. Inspect all gaskets and gasket contact surfaces of the housing. Should faulty gaskets be
evident, correct the condhion immediately.
3. If the clean element is to be stored for later use, it must be stored in a clean container.
4. After the element has been installed, inspect and tighten, if necessary, all air inlet con·
nections prior to resuming operation.
PRIMARY SEPARATOR REPLACEMENT - When the separator maintenance indicator
shows a red signal, separator replacement is necessary. Follow the procedure explained
below for separator replacement.
1. Remove all piping connected to the sump cover to allow removal (return line, service
line, etc.).
2. Remove cover bolts and lift cover from sump.
3. Remove separator element.
4. Scrape old gasket material from cover and flange on sump.
5. Install gaskets.
6. Install element.
7. Inspect secondary separator element and replace if necessary (see Secondary Separator
Replacement) .
8. Replace sump cover and bolts.
9. Reconnect all piping. Return line tube should extend to the bottom of the separator
element or no more than 1/2" (12.7 mm) up from the bottom. This will assure proper
coolant return flow.
•
10. Clean the return line strainer prior to re-starting the machine.
5-20
--- Page 20 ---
BI005959
FLEXMASTER COUPLING MAINTENANCE - Flexmaster coupling maintenance nor·
mally requires the replacement of the two (2) gasket rings on the coupling. The appro-
priate gasket rings for coupling No. 41085 and No. 41353. Follow the procedure below for
proper installation.
c:;)
_
SPECIAL NOTE:
Self·restrained
gasket installation.
Gasket (2) Gasket (5)
Sleeve (3) \ Retainer (4)
..-. - - - - - - . ; r
• ' ~-
'~ ••••_••••• __ ~ i ~
STEP 1
Coupling
COUPLING
(see table)
FLEXMASTER COUPLING STEP 3 STEP2
PIPE END PREPARATION
1. Deburr and clean the pipe ends.
2. The pipe ends should be free of all deep scratches, gouges, dents, etc. A special finish
is not required.
JOINT INSTALLATION
1. Install the retainer (1), gasket (2), and sleeve on one side of the pipe as shown in Step 1.
2. Install the remaining retainer (4) and gasket (5) on the other pipe end.
3. Position the retainer (4) and gasket to proper pipe insertion depth ("0") as shown in
Table 1.
5-30
--- Page 21 ---
BI005959
SECTION 6
AUXILIARY AIR SYSTEM
The AUXILIARY AIR SYSTEM is quite simple in operation. Reasonable care and mainte-
nance ensures a long and trouble free life. This system supplies air to the lube system, horn,
the valve on main air compressor intake and to the exhaust/discharge valve, also on main
compressor.
The auxiliary air provides a vital link in the safe operation of this machine. The operator
MUST CONSTANTLY check the pressure gauge, Item 19 on drill control stand. If at any
time this pressure DROPS below 80 psi (552 kPa), SHUT DOWN and investigate the cause.
NEVER OPERATE MACHINE WITHOUT FULL TANK PRESSURE OF 80 TO 100 PSI
(552 to 690 kPa).
COMPRESSOR is located in the machinery house and mounts on the floor. It consists
of an electric motor driven, single stage compressor, automatic pressure switch and a 60
gallon receiver tank mounted under floor.
INSPECT the belt drive often. Maintain proper belt tension which permits no more than
one half inch deflection. Adjust by moving the electric motor on the base. CHECK crank·
case oil level daily and keep at dipstick FULL mark. Every 500 operational hours, drain and
flush the crankcase. Look in lubrication charts, (Section 7), for the proper NON·DETER·
GENT oil to use. Clean the intake air filter once a week, or daily if conditions require, with
a non·explosive solvent and allow to dry before reinstalling.
LUBR ICATOR - The lubricator is located in the main line
coming from the receiver tank. Its purpose is to lubricate the
air cyl inders to prevent friction damage and corrosion caused
by moisture in the air supply. The unit should be adjusted to
provide 25 drops of oil per minute. This is done by adjusting
the oil feed adjustment located on top of the unit, and count-
ing the number of drops thru the sight"glass.
Operation of the lubricator is simple. Air enters the lubricator
at point A. The oil bowl is pressurized by admitting air via the
reversible venturi tube, B. Air flowing thru the lubricator
creates a reduced pressure area as it passes thru the venturi
section. Therefore, oil is forced to flow up the siphon tube, C,