Rev.AGroundsmaster 4100 --D/4110--D Hydraulic SystemPage 4 -- 45
Procedure for Traction Circuit Reducing Valve (PR)
Pressure Test
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2. Parkmachineonalevelsurfacewiththecuttingdeck
loweredandoff.Makesureengineis offandtheparking
brake is engaged.
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.
3. Connect a 1000 PSI (70 bar) pressure gauge to test
port on 4WD control manifold under radiator (Fig. 32).
4. After installing pressure gauge, start engineand run
at idle speed. Check for hydraulic leakage at pressure
gauge location and correct before proceeding with test.
5. Move throttle so engine is runningat high idle speed
(2870 RPM). Make sure that Hi/Low speed switch is in
the Low speed (4WD) position.
6. Sitonseat,applybrakesfullyandslowlydepressthe
traction pedal in the reverse direction. While pushing
traction pedal, look at pressure reading on gauge:
GAUGE READING TO BE approximately 650 PSI
(45 bar).
7. Stop engine and record test results.
8. If specification is not met, clean or adjust pressure
reducingvalve(PR)in4WDcontrolmanifold.Thisvalve
is located on the front side of the 4WD control manifold
(Fig. 33). See Adjust Control Manifold Relief Valves in
theAdjustmentssection of thischapterforthe valvead-
justmentprocedure.Recheckreducingvalve(PR)pres-
sure setting and readjust as needed.
9. When testing is complete, disconnect pressure
gauge from test port on control manifold.
1. 4WD control manifold
2. Pressure test port
Figure 32
2
1
1. Manifold: front side 2. Reducing valve (PR)
Figure 33
1
2
Hydraulic
System
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