Procedure for Piston Pump (P3) Flow and Traction
Relief Pressure Test:
11.Slowly push traction pedal fully to forward position.
traction relief valve setting by slowly closing
12.Verify
1.
perature. Park machine on a level surface with the cut-
ting units lowered and off. Make sure engine is off.
Make sure hydraulic oil is at normal operating tem-
flow control valve on tester. System pressure should be
3000 PSI as the relief valve lifts. Release traction pedal
and open tester flow control valve fully.
2.
Read Precautions for Hydraulic Testing.
13.If relief pressure specification is not met, consider
the following:
3.
Make sure that traction pedal is adjusted to the neu-
tral position (see Traction Unit Operator’s Manual).
A. The traction belt may be worn or slipping.
B. The traction relief valve leaks or is faulty.
C. The hydrostat needs to be repaired or replaced.
CAUTION
One front wheel will be off the ground during
testing.Makesuremachineissupportedsoitwill
not move and accidentally fallto prevent injuring
anyone under machine.
14.If the traction relief valve tests properly, verify piston
pump (P3) flow as follows:
A. Slowly push traction pedal in forward direction
until pressure gauge reads 1000 PSI. Verify with a
phototac that the pump speed is 2350 RPM (engine
speed approximately 2450 RPM).
4.
Block up one front traction wheel off the ground to al-
low flow through the traction circuit; disconnect brake
linkage to the raised front wheel (see Adjust Brakes in
the Adjustments section of Chapter 7 -- Chassis).
B. Observe flow gauge. TESTER READING should
be approximately 12.5 GPM.
5.
of the machine.
Chock remaining front wheel to prevent movement
15.Release
test results.
traction pedal and turn off machine. Record
6.
and something immovable in the shop.
Attachaheavychaintotherearofthemachineframe
NOTE: If charge pressure is good under no load, but
drops below specification when under traction load, the
piston pump and/or wheel motor(s) should be sus-
pected of wear. When a pump and/or motor is worn or
damaged, the charge pump is not able to keep up with
internal leakage in the traction circuit (See Charge Re-
lief Valve Pressure Test in this section).
7.
the ground from rotating.
Make sure parking brake is on to keep the wheel on
WARNING
16.If
specifications are not met, the hydrostat needs to
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved. See Relieving Hy-
draulic System Pressure in the General Infor-
mation section.
be repaired or replaced as necessary.
17.Relieve
hydraulic system pressure (See Relieving
Hydraulic System Pressure in the General Information
section). Disconnect tester from hydraulic fitting and
hose. Reconnect hose to pump connection.
8.
the engine side of the hydrostat (Fig. 18).
Disconnect hose from the lower hydraulic fitting on
18.Connect
in the Adjustments section of Chapter 7 -- Chassis).
brake linkage to wheel (see Adjust Brakes
9.
with the pump and the disconnected hose. Make sure
the tester flow control valve is fully open.
Install hydraulic tester (pressure and flow) in series
10.Start
engine and move throttle to full speed (3050 +
50
RPM).
2
1
CAUTION
Figure 18
During testing, the front wheel on the ground will
be trying to move the machine forward.
1.
Lower hydraulic fitting
2.
Piston pump
Groundsmaster 3505--D
Page 4 -- 31
Hydraulic System
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