Procedure for Engine Cooling Fan Circuit Gear
Pump Flow Test
6. While watching tester pressure gauges, slowly close
tester flow control valve until 1000 PSI (69 bar) is ob-
tained on gauge. Verify engine speed continues to be
1.
Make sure hydraulic oil is at normal operating tem-
2870
RPM.
perature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydrau-
lic tank is full.
GAUGE READING TO BE: Flow approximately 7
GPM (26 LPM) at 1000 PSI (69 bar).
2.
Park machine on a level surface with the cutting
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
decks lowered and off. Make sure engine is off and the
parking brake is applied. Raise and support seat to gain
access to the gear pump.
7.
Open tester flow control valve, stop engine and re-
cord test results.
8.
If a pressure of 1000 PSI (69 bar) could not be ob-
CAUTION
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 section for engine
cooling fan circuit is worn or damaged.
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.
9. When testing is complete, remove tester and recon-
nect hose to pump fitting.
3.
With the engine off and cutting decks lowered, dis-
connect the hydraulic hose from the 90o fitting in the last
gear pump section which supplies the engine cooling
fan circuit (Fig. 54).
2
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
4.
the fitting and the disconnected hose. Make sure the
flow control valve on tester is fully open.
Install tester (flow and pressure) in series between
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.
3
Figure 54
5.
(2870
Start the engine and move throttle to high idle speed
RPM). DO NOT engage the cutting decks.
1.
2.
Gear pump
Fan drive manifold
3.
4.
Engine cooling hose
90 fitting
o
Groundsmaster 4000--D/4010--D
Page 4 -- 69
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
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| Language | English |
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