TEST NO. 5: Check Reel Motor Cross−Over Relief Pressure
FROM
LIFT CIRCUITT
CUTTING
CIRCUIT
TEST PORT
G
T
PRIORITY
IN
B
A
(TYP)
IN
FROM
GEAR PUMP
OUT
3000
PSI
B
A
T
B
A
TO HYDRAULIC
OIL TANK
Figure 19
NOTE: Before testing a reel motor for possible failure,
make sure to inspect the affected cutting unit for pos-
sible causes of malfunction. Eliminate such possible
causes as: bad reel bearings, bent or damaged reel,
jammed debris, etc. It is often helpful to remove the reel
motor from the unit when inspecting.
CAUTION
Keep away from reels during test to prevent per-
sonal injury from the rotating reel blades.
Check Relief Pressure
7. Position reel speed control knob to minimum
speed. Start engine and move throttle to low idle speed
of 1200 RPM.
NOTE: The reel motor has an internal relief valve that
relieves when the pressure across the motor exceeds
1500
+ 100 PSID.
IMPORTANT: Each reel motor has two cross−over
reliefs. Test relief in the backlap direction only if a
problem is expected.
1.
Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
8. Gently ease reel control lever to MOW. If testing the
reel motor in the backlap direction, gently ease reel con-
trol lever to BACKLAP. Slowly raise engine speed to
high idle speed of2400 RPM while monitoring pressure.
The pressure difference between the two gauges
should be from 1400 to 1600 PSI.
2.
Make sure machine is parked on a level surface.
Lower cutting unit to be tested. Make sure engine is
OFF, and the parking brake is engaged.
3.
4.
Read Precautions for Hydraulic Testing.
A. If pressure is greater than the specified range,
stop the engine and repair or replace the reel motor.
Block reel being tested to prevent rotation. Use a
substantial hardwood block inserted between the reel
blades.
B. If pressure is less than the specified range,
check reel pump output pressure (TEST NO. 3:
Check Reel Circuit Working and Relief Pressures).
If reel circuit pressure is correct, check reel motor
cross−over relief valve for damage.
5.
Disconnect supply hose from the motor. Install test
gauge with T−connector in series with the motor and dis-
connected supply hose.
6.
gauge with T−connector in series with the motor and dis-
connected return hose.
Disconnect return hose from the motor. Install test
9.
lever to STOP position. Stop the engine.
Disengage cutting units by positioning reel control
10.
Disconnect tester from motor and hose. Reconnect
hose to the pump. Remove hardwood block from reel.
Reelmaster 4000−D
Page 4 − 35
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro 4000 D, Toro 98958SL |
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