Terex RT700 - Fluid Motor Troubleshooting

TROUBLESHOOTING
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.
MOTOR WILL NOT TURN
Pumps not engaged................................................................................Engage pumps.
No oil.....................................................................................................Fill reservoir to proper oil level.
Pump broken .........................................................................................Replace pump.
Relief valve stuck open or set too low ..................................................Clean and free relief valve spool and adjust to
proper setting.
Work load jammed or stuck ..................................................................Remove obstruction from work load.
Large contaminating foreign bodies in fluid .........................................Flush hydraulic system completely. Use new oil and
install new filters.
SLOW OPERATION
CAUSE REMEDY
Wrong oil viscosity ...............................................................................Use proper viscosity oil.
Rotary manifold leaking........................................................................Reseal rotary manifold.
Worn pump............................................................................................Repair or replace pump.
Extremely high fluid temperatures causing
pump and motor to slip (temperature increases
as pump and motor wear)......................................................................Add heat exchangers.
Relief setting too low ............................................................................Set relief valve for proper psi.
FLUID MOTOR
RT700 Series Page 5 - 26 Issued: August 2003