Toro Reelmaster 4500–D Service Manual page 198

TEST NO. 7: Checking Lift Circuit Working Pressure or Relief Pressure
Procedure For Working Pressure Check:
1. Install a 5,000 psi gauge onto the quick disconnect of
the lift valve.
2. Operate the unit while monitoring the gauge.
RANGE OF TESTER READINGS 500 – 2900 PSI
3. If working pressure is too high or too low, perform re-
lief pressure check.
Procedure For Relief Pressure Check:
1. Hydraulic oil must be at operating temperature.
2. Install a 5,000 psi gauge onto the quick disconnect of
the lift valve.
3. Start the engine and move the throttle to full speed
(2500 rpm).
4. Engage the control lever into the "LIFT" position. Mo-
mentarily hold the lever in the engaged position after full
cylinder extension and read gauge.
TESTER READING TO BE APPROXIMATELY
2650 – 2900 PSI
NOTE: Always set counterbalance pressure to desired
amount before attempting to adjust lift pressure.
5. If pressure is too high, clean and adjust relief valve in
lift valve by removing the required shims. If pressure is
too low, check for restriction in pump intake line. Check
the lift cylinder for internal leakage. If cylinder is not
leaking, adjust the relief valve by adding the required
shims. If pressure is still too low, repair or replace steer-
ing/lift pump.
Hydraulic System
Page 4 – 36
Figure 22
Reelmaster 4500–D