TM 9-2350-256-20
CHAPTER 2: VEHICLE MAINTENANCE lNSTRUCTlONS
2-17 HYDRAULIC TROUBLESHOOTING-Continued
MAIN HYDRAULIC PUMP-Continued
1
Ii no oil flows from hose, check hose for damage
or restriction and replace as necessary (see
paragraph 12-1). If oil flow cannot be restored,
go to step D. If oil flows, go to step C. If
mechanical transmission drive shaft does not
rotate, notify Direct Support Maintenance.
2
If no oil flows from hose after checking hoses
and replacing as necessary, this indicates a
defective power control valve. Notify Direct
Support Maintenance.
C Inspect main hydraulic pump drive shaft. If shaft is
rotating, go to step D. If shaft is not rotating, go to
step E.
Do not attempt to loosen or tighten
hydraulic fittings or lines when system is
pressurized. Severe injury or death to
personnel may result.
D Inspect all hydraulic hoses and connections for
visible indication of leaks or damage.
Replace
hydraulic hoses and tighten fittings as necessary (see
paragraph 12-1). If problem persists, go to step E.
E Inspect main hydraulic pump for broken or
damaged shaft coupling. Tighten bolts and/or
replace missing
bolts and lockwashers (see
paragraph 12-1). Ii additional damage is present or
main hydraulic pump still does not operate, notify
Direct Support Maintenance. If main hydraulic
pump operates but is noisy or fails to develop
sufficient pressure and no additional shaft coupling
damage is present, go to step F.
Dry-cleaning solvent used to clean parts
is potentially dangerous to personnel and
property. Do not use near open flame or
excessive hear. Flash point of solvent is
138°F (59°C).
Particles blown by compressed air can be
dangerous. Be certain to direct air stream
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