Procedure for Lift/Lower Circuit Relief Pressure
Test
8. If relief pressure is too high, remove cap on relief
valve (RV) in lift control manifold (Fig. 37). Adjust valve
by rotating adjustment socket counterclockwise to de-
crease relief pressure (see Adjustable Pressure Valve
in the Adjustments section of this chapter). A 1/8 turn on
thesocket willmakeameasurable change in reliefpres-
sure. Recheck relief pressure and readjust as needed.
Install and tighten cap on relief valve after adjustment.
NOTE: Before attempting to check or adjust lift pres-
sure, make sure that counterbalance pressure is cor-
rectly adjusted.
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
9.
If relief pressure is too low, check for restriction in
gear pump intake line or reservoir strainer. Check the lift
cylinderforinternalleakage. Ifcylinder isnotleaking,re-
movecaponreliefvalve (RV)inliftcontrol manifold(Fig.
2.
decks lowered and off. Make sure engine is off and the
parking brake is applied.
Park machine on a level surface with the cutting
37)
and adjust valve by rotating adjustment socket
clockwise to increase relief pressure (see Adjustable
Pressure Valve in the Adjustments section of this chap-
ter). A 1/8 turn on the socket will make a measurable
change in relief pressure. Recheck relief pressure and
readjustasneeded.Ifpressureisstilltoolow,gearpump
(P3)orliftcylinder(s)shouldbesuspectedofwear,dam-
age or inefficiency. Install and tighten cap on relief valve
after adjustment.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
10.Disconnect
pressure gauge from test port.
3.
Connecta5000PSI(350Bar)pressuregaugetotest
port G3 on lift control manifold (Fig. 37). Route gauge
hose to allow operator to view the gauge.
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
1
5.
(2750
Sit on the seat and operate the engine at full speed
RPM).
6.
While sitting on the seat, press and hold one of the
deck lift switches to fully raise a cutting deck. Momen-
tarilyholdtheswitchwiththedeckfullyraisedwhilelook-
ing at the gauge.
2
GAUGE READING TO BE:
Figure 37
1350
PSI (93 bar) (approximate).
1.
Lift circuit test port G3
2.
Relief valve RV
7.
Stop engine and record test results.
NOTE: Do not remove relief valve from the hydraulic
manifold for adjustment.
Groundsmaster 5900/5910
Page 4 -- 53
Hydraulic System
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