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Reelmaster 3100−D Hydraulic System (Rev. C)
Page 4 − 49
Procedure for Cross−over Relief Pressures
Test:
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 with
the cutting units lowered and off. Make sure engine is off
and parking brake is engaged. Back bedknives off all
reels.
CAUTION
Operate all hydraulic controls to relieve system
pressure and avoid injury from pressurized hy-
draulic oil.
3. Clean hydraulic fittings on suspected faulty reel mo-
tor. Disconnect pressure inlet hose from fitting for the
mow direction of flow.
A. Top 90
o
fitting for the front reel motors.
B. Center fitting for the rear reel motor.
4. Install T−connector with 5000 PSI pressure gauge
between the motor inlet fitting and the disconnected
hose.
5. Put a block of wood between the blades of the cutting
unit being tested to prevent the reel from rotating.
6. Make sure backlap knob on the hydraulic manifold is
in the mow position.
7. One person should sit on the seat and operate the
machine while another person reads the gauge. Start
engine and set throttle to full speed (2650 +
50 RPM).
CAUTION
Keep away from reels during test to prevent per-
sonal injury from the rotating reel blades.
CAUTION
Do not allow system pressure to exceed 1800
PSI. Shut off unit to prevent an over pressure
condition.
8. Engage cutting units. System pressure should be
from 1350 to 1650 PSI as the cross−over relief valve
lifts.
1. Pressure inlet hose
2. Left reel motor
3. Right reel motor
Figure 30
1
2
1
3
1. Rear reel motor 2. Pressure inlet hose
Figure 31
1
2
9. Disengage cutting units and stop engine. If specifica-
tions are not met, replace cross−over relief. If specifica-
tions are met, remove block of wood from cutting unit
and repeat test on other reels in mow direction.
IMPORTANT: Each reel motor has two cross−over
relief valves. Test reliefs in the backlap direction
only if a problem is expected. After testing cross−
over reliefs in the backlap direction, make sure the
reel motor couplings are torqued (see Reel Motor
Removal and Installation in the Service and Repairs
section of Chapter 7 − Cutting Units).
10.Clean suspected reel motor hydraulic fittings. Dis-
connect pressure inlet hose from fitting for the backlap
direction of flow.
A. Bottom 90
o
fitting for the front reel motors.
B. Bottom 90
o
fitting for the rear reel motor.
11.Install T−connector with 5000 PSI pressure gauge
between the motor fitting and the disconnected hose.
Hydraulic
System