Procedure for Traction Circuit Working Pressure
Test:
2
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-
2.
Read Precautions for Hydraulic Testing.
3.
tral position (see Traction Unit Operator’s Manual).
Make sure that traction pedal is adjusted to the neu-
1
WARNING
Figure 16
1.
Hydraulic tube with plug
2.
Floor plate
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.
4.
Remove plug from hydraulic tube connected to front
wheel motors (Fig. 16). Connect test gauge with an at-
tached hydraulic hose to the hydraulic tube opening.
Makesurehoseislongenoughsotheoperator canread
gauge while driving the machine.
5.
50
Start engine and move throttle to full speed (3050 +
RPM).
6.
Drivemachineintheforwarddirection. Observetest
gauge:
A. Pressure while transporting the machine over a
flat, level surface should be about 500 PSI.
B. Pressure driving the machine up a hill should be
about 2500 PSI but can reach relief settings (3000
PSI).
C. Pressure while mowing should range between
1000
to 2000 PSI and will vary with terrain condi-
tions.
7.
Release traction pedal and turn off machine. Record
test results.
8.
If specification is not met, the hydrostat needs to be
repaired or replaced as necessary.
9.
Relieve hydraulic system pressure (See Relieving
Hydraulic System Pressure in the General Information
section). Disconnect test gauge and hose from the hy-
draulic tube. Install plug into tube opening.
Groundsmaster 3505--D
Page 4 -- 27
Hydraulic System
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