3-19
IC-35 PISTON PUMP TROUBLESHOOTING
TROUBLE CAUSES REMEDIES
1. System will A. Brake switch tripped Release brake switch.
not operate B. Oil supply low Check oil level, fill.
in either C. Oil filter clogged Replace filter element.
direction. D. Oil too heavy Use proper viscosity oil.
E. Bypass valve open Close bypass valve.
F. Bad electrical connection Check all related connections.
G. Circuit breaker open Fix short, overload or breaker.
H. Defective switch Replace switch.
I. Defective RPM sensor Fix or replace sensor.
J. Defective controller circuit Replace controller circuit.
Defective pump solenoid Replace pump solenoid.
L. Defective brake release solenoid Fix or replace solenoid or wiring.
M. Low charge pressure--below 200
PSI (14 Bar)
See below: N, O, P, Q.
N. Charge pump relief valve
damaged
Remove relief valve parts. Examine parts and seat.
Replace damaged parts.
O. Damaged internal charge check
valve
Disassemble and determine if check valve is faulty.
P. Charge pump key sheared Inspect charge pump for damage & replace key.
Q. Charge pump worn or scored or
damaged
Remove parts and examine. Replace defective parts. If
severe scoring is indicated, remove complete pump unit,
disassemble and inspect for damage.*
R. Drive coupling broken Inspect coupling for sheared spline.
S. Forward or reverse relief valve
stuck open
Remove relief valve. Clean or replace.
2. Pump is noisy. A. Air in system Fill oil reservoir. Check and fix suction line leaks.
B. Clogged filter Replace filter element.
C. Internal pump or motor wear or
damage
Disassemble, inspect and repair.*
3. Sluggish A. Air in system See Steps 1-B, 1-D, 2-A.
response to B. Low charge pressure See Step 1-L.
acceleration C. Loose bypass valve Close bypass valve.
or deceleration D. Defective brake release solenoid Fix or replace solenoid wiring.
E. Internal pump or motor wear or
damage
Disassemble, inspect, and repair.
F. Reliefe valve dirty and damged Remove, clean, and replace.
*
Pump should be disassembled only by experienced hydraulic pump repair personnel,
preferably at a Sauer Danfoss Service Center.
Courtesy of Crane.Market
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