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 TM 10-3930-644-14&P
b. Oil Leakage Piston
1. Service
Seal If mast assembly tilts too slowly or
Check the cylinder mountings when the truck is
creeps under load, it is an indication that
lubricated. Check stroke of two overhead guard
oil is leaking past piston seal in tilt
cylinder plungers to make sure they are even.
cylinders.
This can be checked as
Uneven stroke can cause serious damage to
follows:
cylinders, guard structure, and frame. Check for
any oil leakage at the cylinder head and hose
(1) Tilt mast assembly forward to its extreme
connections.
limit.
2. Oil Seepage Cylinder head
(2) Loosen hose fittings at front port end of tilt
cylinder.
Oil seepage indicates the packing is worn and
must be replaced.
Check the plunger for
(3) With battery connected and engine
scratches or score marks before Installing new
running place and hold tilt control lever in
packing. Refer to Chapter II OVERHAUL.
forward position; check for oil flow through
the front fittings of cylinders. If oil flows
3. Oil Seepage Piston Packing
out of the opening of cylinder, remove
cylinder and replace piston seal.
If operation of side shift or guard is slow or
sluggish, the oil could be leaking past the piston
(4) To check piston seal when mast assembly
seal ring or packing cup. Check as follows:
is at its extreme backward position,
reverse the procedure in preceding Steps
a. Extend cylinder to maximum limit.
(1) thru (3).
b. Disconnect hoses at front end of both
M. STEERING
cylinders.
For POWER STEERING or POWER ASSISTED
c. Hold control handle in fully extended
STEERING
components
maintenance
refer
to
position. Accelerate engine and check for
appropriate MAINTENANCE MANUAL MODULE.
oil flow through front port. If oil flows from
port, remove cylinder and replace packing.
N.
SIDE SHIFT AND GUARD CYLINDERS (when
applicable)
d. Reverse operation to check cup packing.
2-90
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