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Reelmaster 4000–D
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Hydraulic System
TEST NO. 5: Check Reel Motor Cross–Over Relief Pressure
BA
PRIORITY
OUT
IN
3000
PSI
T
B
A
TEST PORT
CUTTING
(TYP)
B
A
T
T
G
CIRCUIT
FROM
GEAR PUMP
FROM
LIFT CIRCUIT
TO HYDRAULIC
OIL TANK
IN
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.
Check Relief Pressure
NOTE: The reel motor has an internal relief valve that
relieves when the pressure across the motor exceeds
1500 + 100 PSID.
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.
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. Read Precautions for Hydraulic Testing.
4. Block reel being tested to prevent rotation. Use a
substantial hardwood block inserted between the reel
blades.
5. Disconnect supply hose from the motor. Install test
gauge with T–connector in series with the motor and dis-
connected supply hose.
6. Disconnect return hose from the motor. Install test
gauge with T–connector in series with the motor and dis-
connected return hose.
CAUTION
Keep away from reels during test to prevent per-
sonal injury from the rotating reel blades.
7. Position reel speed control knob to minimum
speed. Start engine and move throttle to low idle speed
of 1200 RPM.
IMPORTANT: Each reel motor has two cross–over
reliefs. Test relief in the backlap direction only if a
problem is expected.
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 of 2400 RPM while monitoring pressure.
The pressure difference between the two gauges
should be from 1400 to 1600 PSI.
A. If pressure is greater than the specified range,
stop the engine and repair or replace the reel motor.
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.
9. Disengage cutting units by positioning reel control
lever to STOP position. Stop the engine.
10. Disconnect tester from motor and hose. Reconnect
hose to the pump. Remove hardwood block from reel.
Hydraulic
System