Toro 30821 Service Manual page 73

Procedure for Traction Circuit Working Pressure
Test:
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.
3. Read Precautions for Hydraulic Testing.
4. Make sure that traction pedal is adjusted to the neu-
tral position (see Adjust Traction Drive for Neutral in the
Adjustments Section).
5. Remove plug from hydraulic tube connected to front
wheel motors (Fig. 53). Connect test gauge with a hy-
draulic hose attached to the hydraulic tube opening.
Make sure hose is long enough so the operator can read
gauge while driving the machine.
6. Start engine and move throttle to full speed (3050 +
50 RPM).
CAUTION
Do not operate sidewinder while performing test.
The test gauge hose may get hit by the sidewind-
er carrier and rupture, and cause personal injury.
7. Drive machine in the forward direction. Observe test
gauge:
A. Pressure while transporting the machine over a
flat, level surface should be about 500 PSI.
B. Pressure driving the machine up a steep hill
should be about 3300 PSI but can reach relief set-
tings (3500 PSI).
C. Pressure while mowing should range between
1000 to 2000 PSI and will vary with terrain condi-
tions.
8. Release traction pedal and turn off machine.
9. Disconnect test gauge and hose from the hydraulic
tube. Install plug into tube opening.
10.If specification is not met, the hydrostat needs to be
repaired or replaced as necessary.
Groundsmaster 3500- D
2
1. Hydraulic tube with plug
Page 4 - 33
1
Figure 53
2. Floor plate
Hydraulic System (Rev. G)