Procedure for Engine Cooling Fan Circuit Test
Make sure hydraulic oil is at normal operating tem-
1.
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2
2.
lowered and off. Make sure engine is off and the parking
brake is applied. Raise and support hood.
Parkmachineonalevelsurfacewiththecuttingdeck
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 48
1.
Fan drive manifold
2.
Test port G1
3.
48).
hydraulic hose attached to test port on top of manifold
(Fig. 49).
Raise seat to gain access to fan drive manifold (Fig.
Connect a5,000 PSI (345 bar) pressure gauge with
3
RIGHT
FRONT
2
4.
at idle speed. Check for hydraulic leakage at gauge
location and correct before proceeding with test.
After installing pressure gauge, start engine and run
5.
(2870
Move throttle so engine is running at high idle speed
RPM).
1
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.
Figure 49
1.
2.
Fan drive manifold
PRV solenoid
3.
Test port G1
PRESSURE GAUGE READING TO BE approxi-
mately 3000 PSI (207 bar).
PHOTOTAC READING TO BE: fan speed should be
at least 2800 RPM.
7.
8.
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
(see Engine Cooling Fan Circuit Gear Pump Flow Test).
Stop engine and record test results.
If pressure rises to approximately 3000 PSI (207
NOTE: Ifpressure and fan speed are bothlow andgear
pump flow proves tobe correct, suspect thatseals infan
drive manifold are leaking or faulty (see Fan Drive Man-
ifold Service in the Service and Repairs section of this
chapter).
9.
and reconnect wire harness to PRV solenoid.
When testing is complete, remove pressure gauge
Groundsmaster 4100--D/4110--D
Page 4 -- 67
Hydraulic System
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