Copyright © 2000 Rayco - All Rights Reserved
Printed in U.S.A.
53
RAYCO
®
RG 1635A STUMP CUTTER
T
ROUBLE
-S
HOOTING
Solutions
Adjust Integral Relief Valve
1. Loosen the hex jam nut with a wrench.
2. Using a hex key (Allen wrench), tighten the
adjusting screw (turn clockwise) to increase
system pressure; loosen (turn
counterclockwise) to decrease.
3. Check the pressure settings as directed in the
Hydraulic System Pressure Checks
chart.
(See preceding page.)
4. Continue to tighten or loosen adjusting screw
and checking pressure until pressure is within
the acceptable range.
5. Retighten the jam nut.
Clean Integral Relief Valve
1. Turn off the engine and work all controls back
and forth to relieve internal pressure.
2. Disassemble the relief valve.
3. Clean with compressed air or a clean cloth.
4. Reassemble the relief valve.
5. Set the integral relief valve to the proper setting
based on the
Hydraulic System Pressure
Checks
chart.
NOTICE
Always use a pressure gauge when resetting the
relief valve. A pressure setting greater than 1800
PSI can reduce the life of the pump.
If a lower than acceptable reading is observed in fewer
than all of the hydraulic circuits, first find out if the
problem is in the valve. This may be accomplished by
moving the valve hoses to a different valve which is
known to be functioning properly. Switch (one at a
time to avoid mix-up) hoses between the suspected
defective hydraulic component or control valve and a
known good control valve, and repeat the test.
If switching hoses to another valve produces
satisfactory pressure readings, then the control valve
seals are worn or damaged and should be replaced.
If, however, switching hoses to a valve which is known
to be functioning properly results in unsatisfactory
pressure reading again, it is evident that the cylinder
piston seal is worn or damaged and relieving fluid
through the flaw.
Solution for Faulty Cylinder Piston Seal
The hydraulic cylinder seals should be replaced.
Hydraulic cylinder rebuild kits are available from
RAYCO or your RAYCO dealer.
Symptom
- Cutting Boom Moves
Downward Too Fast
A.
Problem
- Cylinder rod seal
leaking
If when operated, cylinder loses fluid around rod, rod
seal is leaking.