Gradall LOED 534A Service Manual User Manual

Page 40

INTRODUCTION

The following information relates to the main and auxiliary hydraulic control valves used on the LOED
H a n d l e r.

GENERAL INFORMATION

Disassembly and repair procedures are included in this Manual for the different types of relief valves, plunger
styles, check valves, and special devices incorporated in the HUSCO control valves. All parts are available
for replacement except the valve housing and plungers. The plungers are custom fit to the respective bore
with extremely close tolerances AND ARE NOT INTERCHANGEABLE. Whenever excessive wear or dam-
a g e o c c u r s t o t h e p l u n g e r o r b o r e , r e t u r n v a l v e t o f a c t o r y f o r r e b u i l d i n g o r r e p l a c e m e n t .

NOTE

Remove valve from machinery and thoroughly clean the exterior before attempting any disassembly. Dis-
a s s e m b l e o n a n a r e a t h a t i s f r e e o f d i r t a n d c o r r o s i v e m a t e r i a l .

When servicing or rebuilding a valve, it is important to lubricate disassembled parts to prevent corrosion.

T h e f o l l o w i n g l u b r i c a n t s a r e r e c o m m e n d e d :

Lubriplate No. 105 coating seals and “O” Rings.

Lubriplate No. 630 AA

springs, detent parts, plunger end assemblies and any

p a r t s n o t n o r m a l l y i m m e r s e d i n t h e h y d r a u l i c o i l .

NOTE: ALL DYNAMIC SEALS ARE MADE OF SPECIAL COMPOUNDS AND SHOULD BE PURCH-
A S E D F R O M L O E D .

TROUBLE SHOOTING

FIGURE 39