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Page Title:
TABLE 6-2. TROUBLESHOOTING - continued |
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 TABLE 6-2. TROUBLESHOOTING (Cont'd)
STEP
PROCEDURE
CORRECTIVE ACTION
Hydraulic (Cont'd)
4. Control valve
a.
Sticking plungers
a. Overhaul control valve
plungers will not
in control valve.
(paras. 6-181 through
return to neutral.
6-188).
b.
Broken springs or
b. Overhaul control valve
dirt lodged in seats.
(paras. (6-181 through
6-188 ).
5. No operation of
a.
Defective hydraulic
a. Overhaul hydraulic
hydraulic system
pump.
pump (paras. 6-171
when first started
through (6-177).
up.
b.
Defective relief valve
b. Overhaul direction con-
in control valve or
trol valve (paras. (6-181
control valve plunger
through (6-188).
stuck.
6. Slow operation of
a.
Defective hydraulic
a. Overhaul hydraulic
hydraulic system.
pump.
pump (paras. (6-171
through (6-177).
b.
Pump rpm too low.
b. Check pump motor opera-
tion. Overhaul pump
motor if required
(paras. (6-208 through
6-211).
c.
Improper operation of
c. Overhaul direction con-
direction control
trol valve (paras. 6-181
valve due to defective
through 6-188).
parts or foreign mat-
ter.
d.
Worn or scored hoist
d. Overhaul hoist cylinder
cylinder packings.
7. Jerky operation of
a.
Hoist cylinder mis-
a. Overhaul mast assembly.
hydraulic system.
aligned due to distor-
tion or deformation of
mast assembly,
8. Noisy operation of
a.
Defective hydraulic
a. Overhaul hydraulic
hydraulic system.
pump.
pump (paras. 6-171
b.
Chattering relief
b. Overhaul direction con-
valve in direction
trol valve (paras. 6-
control valve.
181 through 6-188).
9. Speed of operation
a.
Defective hydraulic
a. Overhaul hydraulic
slows down after
pump.
pump (paras 6-171
usage.
through 6-177).
6-12
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