Gradall LOED 534A Service Manual - Manual (Page 34)

MAINTENANCE PROCEDURES LOAD CHECK VALVES
C. LOAD CHECK VALVES
Load check valves used on HUSCO control valves normally do not require servicing; malfunction is usually
t h e r e s u l t o f f o r e i g n m a t t e r l o d g i n g b e t w e e n t h e s e a t a n d p o p p e t .
DISASSEMBLY
Remove valve plug, poppet spring and poppet.
INSPECTION AND REPAIR
Clean parts with solvent and blow dry with compressed air. Examine poppet and poppet seat for nicks
or scratches. Minor nicks or scratches can be removed by lapping poppet and seat with a fine grade lapping
c o m p o u n d .
CAUTlON: DO NOT ALLOW LAPPING COMPOUND TO REMAIN IN VALVE.
R e p l a c e O - r i n g i f d a m a g e d o r d e t e r i o r a t e d . R e p l a c e s p r i n g i f w e a k o r d i s t o r t e d .
ASSEMBLY
Assemble poppet and poppet spring to housing. Replace O-ring to valve plug to
housing.
Load Check Valve
34
FIGURE 28