Figure 4D-5. Control Valve Operation (36Z726)
TROUBLE, CAUSE AND REMEDY CHART
Defective O-rings in valve body.
Oil leaks at either end of spool.
Spring-centered spools do not
return to neutral.
Clean system and valve.
Check linkage for binding condition.
Misalignment of operating linkage.
Repair, clean and readjust.
Relief valve not properly set, or
No motion, slow or jerky action
stuck in base and/or worn.
of hydraulic system.
Disassemble, clean and reassemble.
Dirt or foreign particles Iodged
between relief valve control pop-
pet and seat.
Spool not moved to full stroke.