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1. Symptom:
In most cases a check valve will fail such that the load
will drift down when the unit is in the "hold" position.
NOTE: Check cylinder for leakage past piston seals. A
bad piston seal will give the same symptom.
2. Repair procedures
• Remove the spring retainer.
• Remove spring.
• Remove ball or poppet.
• Start pump to "flush" dirt from seat area. (Caution: Use
hand or a piece of hose to
• divert oil into a container. DO not look into the port.)
• Inspect ball or poppet for damage and replace if
necessary.
• Reinstall ball or poppet
• "Seat” the ball using a small drift punch and hammer
with a light tap.
• Reinstall the spring.
• Replace the spring retainer to the correct depth.
B. Blocked Flow Valve
1. Symptom:
Once in a while a ball type check valve will restrict flow to
the point where the spring will collapse and the flow will
be greatly reduced (even blocked) causing flow over
relief.
2. Repair Procedure:
• Remove the check valve components and replace the
spring.
• If the problem persists replace the ball type with a poppet
type as they cannot completely block flow.
NOTE: Do not use Teflon tape on hydraulic fittings as it
can easily jam valves and plug the filters in the system.
F. Transmission
Eaton Model 6 Hydrostatic Transmissions:
1. Accurate fluid level readings can only be made when the fluid is cold.
2. If the natural color of the fluid has become black or milky, the transmission
has over heated or water containment has occurred. Drain and replace the