Procedure for Steering Circuit Relief Pressure Test
Make sure hydraulic oil is at normal operating tem-
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
1
2.
Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
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 39
1.
Steering circuit pressure test port
3.
steeringcircuitpressuretestportGonthesteering/cool-
ing fan control manifold (Fig. 39).
Connect a 5000 PSI (350 Bar) pressure gauge onto
1
2
4.
at idle speed. Check for hydraulic leakage and correct
before proceeding with test.
After installing pressure gauge, start engine and run
5.
Operatetheengineatfullenginespeed (2750RPM).
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system pressure reading.
Holding the steering wheel against the stop for an
extended period may damage steering compo-
nents.
Figure 40
1.
Steering/fan manifold
2.
Steering relief valve
6.
Turn steering all the way in one direction and mo-
mentarily hold the steering wheel against resistance.
GAUGE READING TO BE:
2000
to 2200 PSI (138 to 151 bar).
7.
Stop engine and record test results.
NOTE: If steering relief pressure is incorrect and lift/
lower problems also exist, gear pump (P3) should be
suspected of wear and inefficiency. If steering wheel
continues to turn at end of cylinder travel (with lower
thannormaleffort),thesteeringcylinderorsteeringcon-
trol valve should be suspected of wear or damage.
8.
Ifreliefpressure specification is notmet,adjustrelief
valve (RV) in steering/cooling fan control manifold (Fig.
so that pressure is correct (see Adjustable Pressure
Valve in the Adjustments section of this chapter).
40)
9.
Disconnect pressure gauge from manifold test port.
Groundsmaster 5900/5910
Page 4 -- 55
Hydraulic System
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