Groundsmaster 4100 --D/4110--D Hydraulic SystemPage 4 -- 67
Procedure for Engine Cooling Fan Circuit 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 applied. Raise and support hood.
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. Raise seat to gain access to fan drive manifold (Fig.
48).Connecta5,000PSI(345bar)pressuregaugewith
hydraulic hose attached to test port on top of manifold
(Fig. 49).
4. After installing pressure gauge, start engineand run
at idle speed. Check for hydraulic leakage at gauge
location and correct before proceeding with test.
5. Move throttle so engine is runningat high idle speed
(2870 RPM).
6. While monitoring the pressure gauge and using a
phototac to identify the cooling fan speed, disconnect
the wire harness connector (white/green and black
wires)fromthePRVsolenoidonfandrivemanifold.Both
fan speed and pressure should increase and stabilize
after the solenoid is disconnected.
PRESSURE GAUGE READING TO BE approxi-
mately 3000 PSI (207 bar).
PHOTOTACREADINGTOBE:fanspeed shouldbe
at least 2800 RPM.
7. Stop engine and record test results.
8. I f pressure rises to approximately 3000 PSI (207
bar) but fan speed is low, consider that the fan motor is
worn or damaged. If pressure and fan speed are both
low, consider that the gear pump is worn or damaged
(seeEngineCoolingFanCircuit Gear PumpFlow Test).
NOTE: Ifpressureandfanspeedarebothlowandgear
pumpflowprovestobecorrect,suspectthatsealsinfan
drivemanifoldareleaking or faulty (see Fan DriveMan-
ifold Service in the Service and Repairs section of this
chapter).
9. When testing is complete, remove pressure gauge
and reconnect wire harness to PRV solenoid.
1. Fan drive manifold 2. Test port G1
Figure 48
1
2
1. Fan drive manifold
2. PRV solenoid
3. Test port G1
Figure 49
1
2
3
FRONT
RIGHT
Hydraulic
System
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