Procedure for Engine Cooling Fan Circuit Gear
Pump Flow Test
7. Move throttle so engine is running at high idle speed
(2870 RPM). DO NOT engage the cutting deck.
1.
Make sure hydraulic oil is at normal operating tem-
8. While watching tester pressure gauge, slowly close
flow control valve until 1000 PSI (69 bar) is obtained on
pressure gauge. Verify engine speed continues to be
2870 RPM.
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
2.
lowered and off. Make sure engine is off and the parking
brake is applied. Raise and support seat.
Parkmachineonalevelsurfacewiththecuttingdeck
GAUGE READING TO BE: Flow approximately 7
GPM (26 LPM) at 1000 PSI (69 bar).
NOTE: If engine speed drops below 2870 RPM during
testing, expect pump flow to decrease.
CAUTION
9.
Open the tester flow control valve and stop the en-
gine. Record test results.
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.
10.If
a pressure of 1000 PSI (69 bar) could not be ob-
tained or flow is lower than 6 GPM (23 LPM), check for
restriction in pump intake line. If intake line is not re-
stricted, consider that gear pump is worn or damaged.
3.
hose at the last gear pump section which supplies the
engine cooling fan circuit (Fig. 50).
Thoroughly clean junction of fitting and hydraulic
11.
nect hose to pump fitting.
When testing is complete, remove tester and recon-
4.
Withtheengineoffandcuttingdecklowered,discon-
nect the hydraulic hose from the 90o fitting in the last
gear pump section.
2
RIGHT
FRONT
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow from the pump section, through the tester and
into the hydraulic hose.
1
4
5.
Install tester with pressure gauge and flow meter in
series between the fitting and the disconnected hose.
Makesuretheflowcontrolvalveonthetesterisfully
open.
6.
speed. Check for hydraulic leakage at tester location
and correct before proceeding with test.
After installing tester, start engine and run at idle
3
Figure 50
IMPORTANT: The pump is a positive displacement
type. If pump flow is completely restricted or
stopped, damage to the pump, tester or other com-
ponents could occur.
1.
2.
Gear pump
Fan drive manifold
3.
4.
Cooling fan supply hose
90 fitting
o
Groundsmaster 4100--D/4110--D
Page 4 -- 69
Hydraulic System
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| Language | English |
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