Toro Reelmaster 4500–D Service Manual page 192

TEST NO. 1: Checking Traction Circuit Working Pressure Or Relief Pressure
Procedure for Working Pressure Check:
1. Install a 10,000 psi gauge into the traction circuit quick
disconnect for the function to be checked.
2. Operate the unit while monitoring gauge. NOTE: If the
machine is equipped with 4WD, check working pressure
in both 2WD and 4WD modes.
RANGE OF TESTER READINGS: 50 – 5200 PSI
NOTE: Typical working pressure during operation
while going uphill, would be approximately 4000 PSI
in 2WD and 2500 PSI in 4WD.
3. If working pressure is too low in 2WD, perform the
traction circuit relief pressure check.
NOTE: If pressure is good in 2WD but to low in 4WD,
check the cartridge valve seals in the 4WD valve block.
If 4WD pressure is low after making repairs to the valve
block the rear wheel motor(s) should be suspected of
wear and inefficiency. Maximum allowable bypass for
each rear wheel motor is 2 GPM.
Procedure for Relief Pressure Check:
1. Hydraulic oil must be at operating temperature.
2. Install a 10,000 psi gauge into the traction circuit quick
disconnect for the function to be checked.
3. Set traction pedal stop for minimum ground speed (1
mph).
4. Start the engine and move throttle to full speed (2500
rpm) and release the parking brake.
5. Carefully drive the machine into position so it will push
against a strong wall or other immovable obstacle. Con-
tinue an attempt to go forward with the machine against
the obstacle and read the pressure gauge.
TESTER READING TO BE APPROXIMATELY
5000 – 5200 PSI
6. If traction pressure is too low, inspect the traction
pump check valves and relief valves. Clean or replace
relief valve(s) or check valves as necessary. If check
valves and relief valves are in good condition, the trac-
tion pump and / or motors should be suspected of wear
and inefficiency.
Hydraulic System
Page 4 – 30
Figure 15
Reelmaster 4500–D