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.
decks lowered and off. Make sure engine is off and the
parking brake is applied. Raise and support hood.
Park machine on a level surface with the cutting
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 52
1.
Fan drive manifold
2.
Test port G1
3.
Raise seat to gain access to the fan drive manifold
(Fig.52).Connecta5,000PSI(345bar)pressuregauge
with hydraulic hose attached to test port on top of man-
ifold.
2
4.
(2870
Start the engine. Move throttle to high idle speed
RPM).
5.
While monitoring the pressure gauge and using a
1
phototac to identify the cooling fan speed, disconnect
the wire harness connector (white/green and black
wires) from the PRV solenoid on fan drive manifold (Fig.
53).
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).
Figure 53
2.
PHOTOTAC READING TO BE: fan speed should be
at least 2800 RPM.
1.
Fan drive manifold
PRV solenoid
6.
7.
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
in this section).
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).
8.
andreconnectwireharnesstoPRVsolenoid.Lowerand
secure hood and operator seat.
When testing is complete, remove pressure gauge
Groundsmaster 4000--D/4010--D
Page 4 -- 67
Hydraulic System
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