ProcedureforRearTractionCircuit(RV)ReliefPres-
sure Test
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-
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
2
3
1
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.
Figure 27
1.
2.
4WD control manifold
Test port G2
3.
Relief valve RV
3.
on 4WD control manifold on right side of machine (Fig.
27).
Connect a 5000 PSI (350 Bar) gauge to test port G2
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
5.
6.
lowered. Drive down a slope in a forward direction, de-
crease pressure on the traction pedal and monitor the
pressure gauge. Pressure should increase until the re-
lief valve (RV) lifts. Record test results.
Operatetheengineatfullenginespeed (2750RPM).
Operate the machine in 4WD with the cutting decks
GAUGE READING TO BE:
1200
PSI (83 bar) (approximate).
7.
Ifnecessary,adjust therelief valve (RV) so that pres-
sureiscorrect(seeAdjustablePressure ValveintheAd-
justments section of this chapter). Relief valve (RV) is
located on the rear side of the 4WD control manifold
(Fig. 27).
8.
Disconnect pressure gauge from manifold test port.
Groundsmaster 5900/5910
Page 4 -- 45
Hydraulic System
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