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Adjust Counterbalance
Pressure
For best performance, the cutting unit bounce on uneven
turf is minimal and it does not ride heavily over flat terrain.
If scalping occurs or the cut is uneven from side to side,
there may be too much weight on the deck and the weight
may have to be transferred to the traction unit: i.e.
increased counterbalance pressure.
By contrast, if too much weight is transferred to the traction
unit, the deck will bounce excessively and the cut will be
uneven. If the cutting unit does not perform properly, adjust
the counterbalance pressure as follows:
1. To make sure the the fluid is warm, operate the machine
for 15 minutes prior to adjusting the counterbalance
pressure.
2. Ensure the parking brake is set, the PTO switch is in
OFF position and the lift lever is in the FLOAT
position.
3. Connect a pressure gauge to the test port behind the left
lift cylinder (Fig. 11).
Figure 11
1. Test port
4. Loosen the jam nut at the bottom of the lift valve
(Fig. 12). The lift valve is located on the right side of
the machine.
1
2
2. Left lift cylinder
2
1. Lift valve
2. Jam nut
5. Start the engine and set the throttle to high idle.
6. Using an Allen wrench, adjust the lift valve spool until
the desired pressure is attained on the gauge. See the
chart below for the recommended pressure setting for
the cutting deck.
Cutting Deck
52" Side Discharge Deck
(Model 30555)
60" Side Discharge Deck
(Model 30366)
or
62" Rear Discharge Deck
(Model 30367)
or
62" Guardian Recycler
Deck
(Model 30376)
72" Side Discharge Deck
(Model 30368)
or
72" Rear Discharge Deck
(Model 30369)
or
72" Guardian Recycler
Deck
(Model 30379)
7. Stop the engine.
8. Tighten the jam nut on the lift valve. Torque nut to
10–12 ft.–lb.
9. Remove the pressure gauge from the test port.
21
1
3
Figure 12
3. Spool
Counterbalance Pressure
100 psi
175 psi
220 psi
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