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TM 10-3930-638-24&P
2-56. HYDRAULIC LIFT SYSTEM MAINTENANCE
a. Operational Test.
This procedure provides an operational test of the control valve, associated cylinder (lift, tilt, rotation, and sideshift) assem-
blies, and hoses, lines and fittings. This procedure may also be used to quickly troubleshoot the mast assembly to determine
what components are defective.
INITIAL SETUP
TOOLS
EQUIPMENT CONDITION
No. 1 Common Organiza -
NSN 4910-00-754-0654
Paragraph
Condition Description
tional Maintenance Tool Kit
Vehicle parked on level surface, parking
brake applied and engine off.
MATERIALS/PARTS
None
.
.
STEP
PROCEDURE/ACTION
NORMAL
IF INDICATION
IF INDICATION
INDICATION
IS NORMAL
IS ABNORMAL
1
Check hydraulic reservoir –
—
—
oil level; add hydraulic oil
if oil level is not between
FULL and ADD marks on
dipstick with mast lowered
(refer to current lubrication
order)
2
Start engine and operate –
—
—
at idle speed
3
Place lift control lever
Mast moves
Proceed to step 4
Check hoses, lines and fittings between control
in RAISE position; release
upward
valve and lift cylinder assembly for oil leaks.
lever when mast reaches
smoothly
Tighten loose fittings/replace leaking hose
full height
(para 2-56f). Check lift chains and pulleys
for wear or damage; replace as necessary
(para 2-56d). If hoses, lines, fittings, lift
chains and pulleys okay, notify direct sup-
port maintenance
4
Place tilt control lever in
Mast moves
Proceed to step 7
Proceed to step 5
FWD position; release
forward
when mast is in full
smoothly
forward position
5
With mast in full forward
No oil leakage
Reconnect fitting Notify direct support maintenance (tilt
position, disconnect fitting
at tilt cylinder
to tilt cylinder
cylinder assembly requires replacement)
at rod end of tilt cylinder
assemblies
assemblies. Pro-
assemblies and plug fitting.
port where
teed to step 6
Place tilt control lever in
fitting discon-
FWD position and hold
netted
6 Check hoses, lines and
No oil leaks
Notify direct sup- Tighten fittings; replace leaking hoses (para
fittings between control
port maintenance 2-56f(1))
valve and tilt cylinder
(control valve
assemblies for oil leaks
requires replace-
ment)
Change 2 2-393
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