TM 5-3805-290-23-1
HYDRAULIC SYSTEM TESTS, INSPECTIONS, AND ADJUSTMENTS - CONTINUED
0017 00
RELIEF VALVE (LINE) TEST AND ADJUSTMENT - CONTINUED
4.
Pressure Compensators.
N OT E
Two situations can exist with pressure compensators that will affect operation of hydraulic system: Pres-
sure compensator is stuck at top of spool guide, or pressure compensator is stuck at bottom of spool guide.
a.
Perform these steps when pressure compensator is stuck at top of spool guide (fully open).
b.
Park machine on smooth, level surface (TM 5-3805-290-10).
c.
Engage parking brake (TM 5-3805-290-10).
d.
Remove left chassis covers (WP 0107 00) for access to piston pump.
e.
Connect dial indicating pressure gage to hose.
Connect other end of hose assembly to test port
(16) of piston pump (17).
f.
Start engine (TM 5-3805-290-10). Run engine at
high idle. Operate control levers and move all
cylinders to increase temperature of hydraulic oil
to normal operating temperature.
g.
Actuate hydraulic circuit. DO NOT allow circuit
to reach pump cutoff pressure. Fully actuate
another hydraulic circuit. Allow second hydrau-
lic circuit to hit stops.
h.
Observe pressure at test port (16) for pump sig-
nal pressure. When second hydraulic circuit hits
stops, observe hydraulic pressure at test port.
Hydraulic pressure is relief pressure for second
circuit. Continue to observe pressure at test port.
If pressure is not relief pressure, pressure com-
pensator is stuck. Replace implement pump (WP
0182 00).
427-B0970
0017 00-16
