Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 69
Procedure for Engine Cooling Fan Circuit Gear
Pump Flow 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.Makesureengineisoffandtheparking
brake is applied. Raise and support seat.
CAUTION
Prevent personalinjury and/or damage to equip -
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Thoroughly clean junction of fitting and hydraulic
hose at the last gear pump section which supplies the
engine cooling fan circuit (Fig. 50).
4. Withtheengineoffandcuttingdecklowered,discon-
nect the hydraulic hose from the 90
o
fitting in the last
gear pump section.
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.
5. Install tester with pressure gauge and flow meter in
series between the fitting and the disconnected hose.
Makesuretheflowcontrolvalveonthetesterisfully
open.
6. After installing tester, start engine and run at idle
speed. Check for hydraulic leakage at tester location
and correct before proceeding with test.
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.
7. Move throttle soengineisrunningathighidlespeed
(2870 RPM). DO NOT engage the cutting deck.
8. While watching tester pressure gauge, slowly close
flow control valve until1000 PSI (69 bar) is obtained on
pressure gauge. Verify engine speed continues to be
2870 RPM.
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.
9. Open the tester flow control valve and stop the en-
gine. Record test results.
10.If a pressure of 1000 PSI (69 bar) could not be ob-
tained or flow is lower than 6GPM(23LPM), c heck for
restriction in pump intake line. If intake line is not re-
stricted, consider that gear pump is worn or damaged.
11.When testing is complete, remove tester and recon-
nect hose to pump fitting.
1. Gear pump
2. Fan drive manifold
3. Cooling fan supply hose
4. 90
o
fitting
Figure 50
1
2
3
4
FRONT
RIGHT
Hydraulic
System
To Next Page
Loading...
