Toro Greensmaster 3150 Service Manual page 47

Procedure for Traction Drive Hydrostat (P3) Flow
Check:
This test measures hydrostat pump output (flow). Dur-
ing this test, pump load is created at the flowmeter using
the adjustable load valve on the tester.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes.
2. Park machine on a level surface with the cutting
units lowered and off. Make sure engine is off. Make
sure the hydraulic tank is full.
CAUTION
Before continuing further, read and become fa-
miliar with Precautions for Hydraulic Testing.
3. Make sure the transmission is adjusted to the neu-
tral position (see the Traction Unit Operator's manual).
4. Block up front wheels off the ground (also rear
wheel if machine is equipped with 3WD) to allow flow
through the traction circuit.
5. Disconnect hose from the upper hydraulic fitting on
the side of the hydrostat.
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. Start engine and move throttle to full speed (2850 +
50 RPM) position.
Greensmaster 3150
Use extreme caution when taking gauge read-
ings. The front tire on the ground will be trying to
move the machine forward.
9. Slowly push traction pedal into fully forward posi-
tion.
Note: Make sure transport speed is properly adjusted.
See Adjusting the Transport Speed in the traction unit
Operator's Manual for additional information.
10. Slowly close flow control valve until pressure gauge
reads 1000 PSI (69 bar).
11. Observe flow gauge. TESTER READING should be
a minimum flow of 13.3 GPM. Record test results.
12. Release traction pedal, open control valve on tester,
and turn off machine.
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).
B. The hydrostat needs to be repaired or replaced
as necessary.
C. Make necessary repairs before performing addi-
tional tests.
14. If specifications are met, check wheel motor effi-
ciency (see TEST NO. 2: Wheel Motor Efficiency in this
chapter).
15. If testing is complete, disconnect tester from pump
fitting and hose. Reconnect hose to pump fitting.
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CAUTION
Hydraulic System