Terex T780 - Swing Circuit Relief Valves

Swing Circuit Relief Valves
CAN’T GET PRESSURE
CAUSE REMEDY
Poppet stuck open or dirt under seal Check for foreign matter between poppets
and their mating members. Members must
slide freely
ERRATIC PRESSURE
CAUSE REMEDY
Poppet seal damaged Replace damaged parts. Clean dirt and
remove surface marks for free movement
PRESSURE SETTING NOT CORRECT
CAUSE REMEDY
Wear due to dirt. Lock nut adj. screw loose See section on “Valve Adjustments”
LEAK
CAUSE REMEDY
Damaged seats, worn “O” rings, parts
sticking due to dirt
Replace worn or damaged parts. Inspect for
free movement of components. Check seats
for scratches, nicks, or other marks
T300-1_T500-1_T780
Troubleshooting
416 P/N 12261-683
REVISED: January 2015