Procedure for Traction Drive Hydrostat (P3) Flow
Test:
Note:
See Adjusting the Transport Speed in the traction unit
Operator’s Manual for additional information.
Makesuretransportspeedisproperlyadjusted.
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.
10. Slowly close flow control valve until pressure gauge
reads 1000 PSI (69 bar).
1.
perature by operating the machine for approximately 10
minutes.
Make sure hydraulic oil is at normal operating tem-
11. Observeflowgauge.TESTERREADINGshouldbe
a minimum flow of 13.3 GPM. Record test results.
12.
Releasetractionpedal,opencontrolvalveontester,
2.
units lowered and off. Make sure engine is off. Make
sure the hydraulic tank is full.
Park machine on a level surface with the cutting
and turn off engine.
13.
If specifications are not met consider the following:
A. The traction pedal and/or traction speed may
need adjustment (see the Traction Unit Operator’s
Manual).
CAUTION
B. The hydrostat needs to be repaired or replaced
as necessary.
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
C. Makenecessary repairsbeforeperformingaddi-
tional tests.
3.
tral position (see the Traction Unit Operator’s manual).
Make sure the transmission is adjusted to the neu-
14.
If specifications are met, check wheel motor effi-
ciency (see Wheel Motor Efficiency Testinthischapter).
4.
Block up front wheels off the ground (also rear
wheel if machine is equipped with 3WD) to allow flow
through the traction circuit.
15. If testing is complete, disconnect tester from hy-
draulic tube and hose. Reconnect hose to tube.
5.
Disconnect hydraulic hose from the hydraulic tube
that connects to the upper hydraulic fitting on the front
side of the hydrostat (Fig. 19).
4
1
6.
Install tester in series with the pump and the discon-
nected hose. Make sure flow control valve on the
tester is fully open.
7.
Make sure functional lever is in the transport posi-
tion.
8.
50
Start engine and move throttle to full speed (2850 +
RPM) position.
CAUTION
FRONT
2
3
Use extreme caution when taking gauge read-
ings. The front tire on the ground will be trying to
move the machine forward.
Figure 19
1.
2.
Hydrostat
Upper fitting
3.
4.
Hydraulic tube
Hydraulic hose
9.
tion.
Slowly push traction pedal into fully forward posi-
Greensmaster 3150
Page 4 -- 31
Hydraulic System (Rev. E)
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| Language | English |
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