Swing - Troubleshooting - Case 570T Operator's Manual

Swing - Troubleshooting

Problem
Right or left swing is
inoperative, is too slow or
loses power
The swing fails to slow
down (bearing stop) at
stroke end
The swing does not stop
when the control lever
returns to neutral (one
direction only)
Cylinder leak (spools in
neutral)
A circuit temporarily
lowers when given the
control to lift
8 - TROUBLESHOOTING
Possible Cause
The swing circuit relief valves are not seat-
ing, set to a too low value or there is a leak
in the seat
Valve spool leaking
Cylinder seals leaking or cylinder barrel
damaged
Built-in sliding limiter damaged
Cylinder seals leaking or cylinder barrel
damaged
The circuit relief valve (return side) is stuck
open, set to a too low value or there is a
leak in the seat
Valve spool leaking
Internal valve leak
Cylinder seals leaking or cylinder barrel
damaged
Load check valve between control valve
sections damaged
Test the swing circuit relief valve
Inspect the spool and check it for wear or
scratches
Inspect and reseal the cylinder and the ring
nut
Disassemble and inspect
Inspect and reseal the cylinder
Test the swing circuit relief valve
Inspect the spool and check it for wear or
scratches
Inspect the spool and check it for wear or
scratches
Inspect and reseal the cylinder
Disassemble and inspect
8-14
Correction