UNDER CARRIAGE MLC165-1 SERVICE/MAINTENANCE MANUAL
8-8
Published 05-26-17, Control # 238-02
CRAWLER HAND PUMP AND JACKING
CYLINDER
Assembly
1. Connect the hose from the pump outlet port to the
cylinder inlet (Figure 8-5
).
2. Apply 1-1/2 wraps of a high-grade thread sealant (Teflon
tape) to the fittings.
Maintenance
See Figure 8-5 for the following procedure.
1. Keep the unit clean and stored in a safe place where it
cannot be damaged.
2. Assure correct pump oil level. To check the level:
a. Turn the pump valve (5) counter-clockwise, push
the jacking handle (6) all the way down, and fully
retract the jacking cylinder (1) rod to return all oil to
the pump. The cylinder must be fully retracted or
the system will contain too much oil after filling.
b. Place the pump (4) horizontally on a flat surface.
c. Using a screw driver, remove the vent fill cap (3).
d. Add hydraulic oil to the pump until the reservoir is
two-thirds full. Do not overfill.
e. Reinstall the vent fill cap.
f. Test pump operation and remove air from system, if
required. Recheck oil level after removing the air.
WARNING
Hand Pump Explosion
The hand pump and cylinder is provided for crawler
adjustment only, any other use is neither intended nor
approved.
Wear safety glasses and other personal protective gear
when operating the hand pump.
Do not set the pump relief valve higher than 10,000 psi
(700 bar). Higher pressure can cause components to
explode.
The pump is not vented. It can explode if subjected to high
pressure. Do not attempt to return more oil to the pump
than it is capable of holding. Do not overfill the pump.
In some cases, the pump handle can “kickback.” Always
keep your body to side of pump, away from line of handle
force.
Do not add extensions to handle. Extensions can cause
unstable operation.
CAUTION
Hand Pump Damage
Do not apply sealant to the first complete thread to ensure
the sealant does not shed into the hydraulic system and
cause malfunctioning or damage.
CAUTION
Leaks and Fitting Damage
Do not overtighten the connections, connections only
need to be snug and leak free. Overtightening can cause
premature thread failure and may cause fittings or
castings to split at lower than their rated pressures.
M100737
Figure 8-5. Crawler Hand Pump
Item Description
1 Jacking Cylinder
2Hose
3Vent Fill Cap
4Pump
5Valve
6 Jacking Handle
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