Procedure for Traction Drive Hydrostat (P3) Flow
Test
CAUTION
This test measures hydrostat pump output (flow). Dur-
ing this test, pump load is created atthe flowmeter using
the adjustable load valve on the tester.
Use extreme caution when taking gauge read-
ings. The front tire on the ground will be trying to
move the machine forward.
1.
Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
9.
tion.
Slowly push traction pedal into fully forward posi-
(10)
2.
minutes.
Park machine on a level surface with the cutting
10.
Slowly close flow control valve until pressure gauge
units lowered and off. Make sure engine is off. Make
sure the hydraulic tank is full.
reads 1000 PSI (69 bar).
Observeflowgauge.TESTERREADINGshouldbe
11.
a minimum flow of 13.3 GPM. Record test results.
CAUTION
12.
Releasetractionpedal,opencontrolvalveontester,
and turn off machine.
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
13.
If specifications are not met consider the following:
3.
Make sure that traction pedal is adjusted to the neu-
A. The traction pedal and/or traction speed may
need adjustment (see Traction Pedal in the Adjust-
ments Section).
tralposition(seeTractionPedalintheAdjustments Sec-
tion). Also, ensure that pump is at full stroke when
traction pedal is pushed into fully forward position.
B. The hydrostat needs to be repaired or replaced
as necessary.
4.
wheel if machine is equipped with 3WD) to allow flow
through the traction circuit.
Block up front wheels off the ground (also rear
C. Makenecessary repairsbeforeperformingaddi-
tional tests.
5.
Disconnect hose from the upper hydraulic fitting on
the side of the hydrostat.
14. If specifications are met, check wheel motor effi-
ciency (see Wheel Motor Efficiency Test in this section).
6.
Install tester with pressure gauge and flow meter in
series with the pump and the disconnected hose. Make
sure flow control valve on the tester is fully open.
15. If testing is complete, disconnect tester from pump
fitting and hose. Reconnect hose to pump fitting.
7.
Make sure functional lever is in the transport posi-
tion.
8.
50
Start engine and move throttle to full speed (2750 +
RPM) position.
Greensmaster 3250--D
Page 4 -- 35
Hydraulic System (Rev. I)
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|---|---|
| Tags | Toro Greensmaster 3250 D |
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| Document Type | Service Manual |
| Language | English |
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