User manual

Groundsmaster 4000 --D/4010--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. Park machine on a lev el surface with the cutting
decks lowered and off. Make sure engine is off and the
parking 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 the fan drive manifold
(Fig.51).Connecta5,000PSI(345bar)pressuregauge
with hydraulic hose attached to test port on top of man-
ifold.
4. Start the engine. Move throttle to high idle speed
(2870 RPM).
5. While monitoring the pressure gauge and using a
phototac to identify the cooling fan speed, disconnect
the wire harness connector (white/green a nd black
wires)from thePRVsolenoidon fandrive manifold(Fig.
52). 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.
6. Stop engine and record test results.
7. If 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
(see Engine Cooling Fan Circuit Gear Pump Flow Test
in this section).
NOTE: Ifpressureandfanspeedarebothlowandgear
pumpflowprovestobecorrect,suspectthatsealsinfan
drivemanifoldareleaking or faulty (see Fan DriveMan-
ifold Service in the Service and Repairs section of this
chapter).
8. When testing is complete, remove pressure gauge
andreconnectwireharnesstoPRVsolenoid.L owerand
secure hood and operator seat.
1. Fan drive manifold 2. Test port G1
Figure 51
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2
1. Fan drive manifold 2. PRV solenoid
Figure 52
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2
Hydraulic
System