TEST NO. 3: Checking Mowing Circuit Working Pressure or Relief Pressure
WORKING Pressure Check:
1. Make sure hydraulic oil is at normal operating
t
emperature by operating machine for approximately 10
minutes.
2. Lower cutting units, engage parking brake and stop
t
he engine.
3. Raise seat to get access to hydraulic test fittings.
Rem
ove access cover from in front of auxiliary pump.
4. Install a 5000 PSI gauge onto mow circuit quick
disconnect fitting. Put gauge and hose through opening
below seat in front of auxiliary pump so gauge can be
observed while sitting on seat.
NOTE: Front axle shift lever must be in LO position for
c
utting units to operate.
5. Operate machine while monitoring gauge.
RANGE OF TESTER READINGS 100 - 2640 PSI.
NOTE: Normal pressure during operation is 1500 -
2000 PSI. Gauge may spike higher during initial
engagement of cutting units.
RELIEF Pressure Check:
6. Lower center cutting unit to the ground.
7. Turn the engine OFF.
8. Use a substantial hardwood block inserted between
reel blades of center cutting unit to prevent rotation.
Center cutting unit motor is first in series from pump.
Stand clear of the reels during the following
procedures:
CAUTION
9. Place reel speed control knob at minimum speed.
10. Start engine and position throttle at idle.
11. Move cutting unit engagement switch into “MOW”
whil
e monitoring gauge.
NOTE: It may be necessary to increase throttle slightly
t
o prevent engine from stalling.
TESTER READING TO BE 2540 ± 100 PSI.
1
Figure 13
(Eaton pump)
1. Mow circuit test port
1
Figure 14
(Sundstrand pump)
1. Mow circuit test port (S/N 39999 & below )
1
Figure 14A
(Sundstrand pump)
1. Mow circuit test port (S/N 40001 & UP)
Testing Page 4 - 26
Rev. A
Reelmaster
®
335-D
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