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TM 10-3930-609-35
Malfunction
Probable cause
Corrective action
b.
Hydraulic direction control valve de-
b.
Overhaul hydraulic direction control
fective.
valve (para 3-53 through 3-58).
3. Hoisting speed erratic.
Bent or distorted mast assembly.
Overhaul mast assembly
(para 3-74 through 3-79).
4. control valve plungers will not re-
a.
Sticking plungers in control valve.
a.
Overhaul control valve
turn to neutral.
b.
Broken springs or dirt lodged in
(para 3-53 through 3-58).
seats.
b.
Overhaul control valve
(para 3-53 through 3-58).
5. No operation of hydraulic system
a.
Defective hydraulic pump.
a.
Overhaul hydraulic pump
when first started up.
(para 3-45 through 3-51).
b.
Defective relief valve in control valve
b.
Overhaul direction control valve
or control valve plunger stuck.
para 3-53 through 3-58).
6. Slow operation of hydraulic sys-
a.
Defective hydraulic pump.
a.
Overhaul hydraulic pump
tem.
(para 3-45 through 3-51).
b.
Pump rpm too low.
b.
check pump motor operation. Over.
haul pump motor if required
(para 3-83 through 3-93).
c.
Improper operation of direction con-
c.
Overhaul direction control valve
trol valve due to defective parts or
(para 3-53 through 3-58).
foreign matter.
d.
Worn or scored hoist cylinder pack-
d.
Overhaul hoist cylinder
ings.
(para 3-67 through 3-72).
7. Jerky operation of hydraulic sys-
Hoist cylinder misalined due to dis-
Overhaul mast assembly
tem.
tortion or deformation of mast as-
(para 3-74 through 3-79).
sembly.
8. Noisy operation of hydraulic sys-
a.
Defective hydraulic pump.
a.
Overhaul hydraulic pump
tem.
(para 3-45 through 3-61).
b.
chattering relief valve in direction
b.
Overhaul direction control valve
control valve.
(para 3-53 through 3-58).
9. Speed of operation slows down after
a.
Defective hydraulic pump.
a.
Overhaul hydraulic pump
usage.
(para 3-45 through 3-51).
b.
Defective direction control valve.
b.
Overhaul direction control valve
(para 3-53 through 3-58).
10. Oil heats up rapidly.
a.
Defective direction control valve.
a.
Overhaul direction control valve
(para 3-53 through 3-58).
b.
Defective hydraulic pump.
b.
Overhaul hydraulic pump
(para 3-45 through 3-51).
11. Hoist cylinder packing leaks.
a.
Worn packings.
a.
Overhaul hoist cylinder
(para 3-67 through 3-72).
b.
Piston scored.
b.
Overhaul hoist cylinder
(para 3-67 through 3-72).
12. Hoist or tilt cylinder lowers or tilts
a.
Worn packing in hoist cylinder or
a.
Overhaul hoist cylinder (para 3-67
while truck is idle.
tilt cylinder.
(para 3-67 through 3-72) or tilt
cylinder (para 3-61 through 3-65).
b.
Defective hydraulic direction control
b.
Overhaul hydraulic direction control
valve.
valve (para 3-53 through 3-58).
13. Mast will not tilt.
a.
Defective hydraulic pump.
a.
Overhaul hydraulic pump
(para 3-45 through 3-51).
b.
Defective direction control valve.
b.
Overhaul direction control valve
para 3-53 through 3-58).
c.
Defective tilt cylinder.
c.
Overhaul tilt cylinder
(para 3-61 through 3-65).
Forward and Reverse Travel
1. Axle noise while under power or
a.
Defective gears or bearings in drive
a.
Overhaul drive axle
while coasting.
axle.
(para 3-5 through 3-14).
b.
brake shoe retainer defective.
b.
Overhaul brake system
(para 3-27 through 3-31).
2. Adapter noise while under power or
a.
Defective gear or pinion in adapter.
a.
Overhaul adapter
coasting.
(para 3-5 through 3-12).
b.
Defective bearing in adapter.
b.
Overhaul adapter
(para 3-5 through 3-12).
2-8

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