Operator's Manual

7
Operate all hydraulic controls to relieve
system pressure and avoid injury from
pressurized hydraulic oil. Controls must be
operated with the ignition switch in RUN and
the engine OFF. Return ignition switch to OFF
when pressure has been relieved. Remove
key from the ignition switch.
Caution
Before disconnecting or performing any work
on the hydraulic system, all pressure in the
system must be relieved by stopping the
engine and lowering or supporting the
cutting units or other implements.
Keep body and hands away from pin hole
leaks or nozzles that eject hydraulic fluid
under high pressure. Do not use hands to
search for leaks; use paper or cardboard.
Hydraulic fluid escaping under pressure can
have sufficient force to penetrate the skin
and cause serious injury. If fluid is injected
into the skin, it must be surgically removed
within a few hours by a doctor familiar with
this type of injury. Gangrene may result from
such an injury.
Warning
1. Thoroughly clean the machine before disconnecting or
disassembling any hydraulic components. Always keep
in mind the need for cleanliness when working on
hydraulic equipment. Contamination will cause
excessive wear of components.
2. Put caps or plugs on any hydraulic lines left open or
exposed during testing or removal of components.
3. The engine must be in good operating condition. Use a
tachometer when making a hydraulic test. Engine speed
can affect the accuracy of the tester readings.
4. The inlet and the outlet hoses must be properly
connected and not reversed (tester with pressure and
flow capabilities) to prevent damage to the hydraulic
tester or components.
B. Procedure for Manifold
Relief Valve Pressure Check:
1. Make sure hydraulic oil is at normal operating
temperature by operating the machine for
approximately 10 minutes.
2. Make sure machine is parked on a level surface with the
cutting units lowered. Make sure engine is off and the
parking brake is engaged.
3. Read Precautions for Hydraulic Testing.
4. Disconnect hose connection on the bulkhead that leads
to the left reel motor inlet port.
5. Disconnect the hose connection at the gear pump that
leads to the Port P1, identified on the bottom of
hydraulic manifold.
6. Install tester in series with the hose and bulkhead
connection. Make sure the flow control valve is fully
open.
7. Connect T–connector and gauge to the fitting and hose
connection at the gear pump.
8. If a backlap kit is installed, make sure backlap knob on
the valve block is in the mow position. Make sure reel
speed knob is set to maximum.
Keep away from reels during test to prevent
personal injury from the rotating reel blades.
Caution
9. Start engine and move throttle to full speed. Engage the
cutting units.
10. Watch pressure gauge carefully while slowly closing the
flow control valve to fully closed. If pressure gauge
does not read 3000 psi, shut off engine and adjust relief
valve. Proceed to Adjusting Manifold Relief Valves,
Item C.
C. Adjust Manifold Relief Valve
Never adjust the relief valve with the
hydraulic system pressurized. Hydraulic oil
may spray out of the valve with the cap off.
Personal injury may result. Always install the
cap and tighten before pressurizing the
system.
Warning