Hydraulic
System
Rev. B
Reelmaster 6500-D/6700-D Hydraulic SystemPage 4 - 39
TEST NO. 3: Cutting Unit Drive Circuit Pressure
Note: The front cutting unitdrive circuit is protectedby
reliefvalve R1and the rear circuitby relief valve R2.See
Hydraulic Flow Diagrams at the beginning of this chap-
ter.
1. Make sure hydraulic oil is at normal operating tem-
perature by operatingthe machinefor approximately 10
minutes.
2. Make sure machine is parked on alevel surface with
the cutting units lowered and off. Make sure engine is
off.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS, and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
3. Raise hood to get access to hydraulic test fittings.
Install a 5000PSI gaugewith extension hoseonto quick
disconnect fitting in port G1 or G2 (Fig. 15).
4. Set reel speed control FC1 or FC2 to position 5.
Make sure Mow/Backlap valve MD1 or MD2 is in the
“Mow” position.
5. Make sure cutting units are completely lowered and
engine is OFF.
To check the front circuit, insert a block of wood be-
tweencuttingunitreelbladesandfrontcrosstubesof
any two-front cutting units to prevent the reels from
turning (Fig. 16). Two cutting unit reels must be
blocked to exceed the 3000 PSI front cutting unit cir-
cuit relief valve R1.
To check the rear circuit, insert a block of wood be-
tweencuttingunitreelbladesandfrontcrosstubesof
any two-rear cutting units to prevent the reels from
turning (Fig. 16). Two cutting unit reels must be
blocked to exceed the rear cutting unit circuit relief
valve R2.
6. Sit on the seat and start the engine. Move throttle to
full speed (3200 RPM).
WARNING
Keepawayfromallreels duringtestto preventper-
sonal injury from rotating reel blades.
1. Test Port G1 (front) 2. Test Port G2 (rear)
Figure 15
1
2
Figure 16
7. While sitting on seat, move ”Enable/Disable” switch
to ENABLE. Move ”Lower- Mow/Raise” lever forward to
engage cutting units, then look at the gauge.
GAUGE READING (front): 3000 +/- 50 PSI.
GAUGE READING (RM 6500--D rear):
2000 +/- 50 PSI.
GAUGE READING (RM 6700--D rear):
3000 +/- 50 PSI.
8. Stop the engine. If pressure is too high, remove cap
on relief valve R1 or R2 and adjust screw to get correct
pressure(seeAdjustManifoldReliefValves).Ifpressure
is too low, check for restriction in pump intake line. Re-
move cap from relief valve R1 or R2 andadjust screw to
get correct pressure. If pressure is still too low, pump or
reelmotorshould besuspected ofwear,damage orinef-
ficiency.
Note: Normal operating pressure when mowing is
approximately 500 to600 PSI. per cutting unit.The front
circuit should operate at 1500 to 1800 PSI. and the rear
circuit should operate at 1000 to 1200 PSI. for 6500-D
and at maximum circuit pressure for 6700-D.
