TROUBLESHOOTING
STICKING PLUNGERS
CAUSE REMEDY
Excessively high oil temperature ..........................................................See section on “Excessive Heating of Oil in System”.
Dirt in oil ...............................................................................................Change oil. Clean system.
Fittings too tight ....................................................................................Check torque.
Valve warped from mounting ...............................................................Loosen valve mounting bolts and check.
Excessively high flow in valve..............................................................Check to see if hoses from pump are not crossed or
reversed.
Plunger damaged ...................................................................................Replace valve.
Return spring damaged..........................................................................Replace faulty parts.
Spring or detent cap binding .................................................................Loosen cap, re-center and re-tighten.
Valve not at thermal equilibrium ..........................................................Let system warm up.
LEAKING SEALS
CAUSE REMEDY
Paint on or under seal............................................................................Remove and clean.
Excessive back pressure........................................................................Open or enlarge line to reservoir.
Dirt under seal.......................................................................................Remove and clean.
Scored plunger.......................................................................................Replace valve.
Loose seal plates....................................................................................Clean and tighten.
Cut or scored seal..................................................................................Replace faulty parts.
LOAD DROPS WHEN CONTROL MOVED FROM NEUTRAL
CAUSE REMEDY
Dirt in check valve ................................................................................Disassemble and clean.
Scored check valve poppet or seat ........................................................Replace poppet or lap poppet to seat.
SWING CIRCUITCONTROL VALVES
RT700 Series Page 5 - 24 Issued: August 2003
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