Toro Reelmaster 4500–D Service Manual page 194

TEST NO. 3: Checking Reel Circuit Working Pressure or Relief Pressure
Procedure For Working Pressure Check:
1. Install a 5,000 psi gauge into the cutting circuit quick
disconnect.
2. Operate the unit while monitoring the gauge.
RANGE OF TESTER READINGS 0 – 2750 PSI
3. If working pressure is too high or too low, perform re-
lief pressure check.
NOTE: Normal pressure during operation is 1500 –
2000 psi. However, the gauge may spike higher during
initial engagement of the control lever.
Procedure For Relief Pressure Check:
1. Hydraulic oil must be at operating temperature.
2. Install a 5,000 psi gauge into the cutting circuit quick
disconnect.
3. Start the engine and lower the No. 2 (left front) and 3
(right front) cutting units to the ground.
4. Turn the engine OFF.
5. Block the reel of the No. 2 cutting unit to prevent rota-
tion. The No. 2 cutting unit motor is the first in series flow
from the pump. Use a substantial hardwood block in-
serted between the reel blades.
Stand clear of the reels during the following
procedures.
6. Place reel speed control knob at minimum.
7. Start engine and position throttle at idle.
8. Ease the reel control lever into "MOW" while monitor-
ing the gauge.
NOTE: It may be necessary to raise the throttle slightly
to prevent the engine from stalling.
TESTER READING TO BE 2650 – 2750 PSI
9. If reel circuit relief pressure is above 2750 psi or below
2650 psi, clean or replace relief valve in reel control
valve.
Hydraulic System
CAUTION
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Figure 18
Reelmaster 4500–D