Printed in U.S.A 69 918215/CP0407
1448 PLUS TROUBLESHOOTING
HYDRAULIC PUMP AND MOTOR SYSTEM
HYDRAULIC CYLINDERS
ELECTRICAL SYSTEM
Problem Possible Cause Corrective Action
System will not operate in
either direction
1. Oil supply low Check oil level and fill
2. Oil filters clogged Replace filter
3. Oil too heavy Use proper viscosity oil
4. Control linkage misadjusted Check to see if control linkage is binding
or unfastened
5. Low charge pressure See corrective action for Causes 6-9
6. Relief valve stuck open Remove, clean or replace
7. Damaged check valve Disassemble and check if valve is faulty
or damaged
System is loud 8. Air in system Low oil level in reservoir
9. Loose suction line Tighten fittings and/or hose
10. Clogged suction filter Replace suction filter
11. Internal pump or motor damage Disassemble, inspect, repair, or replace
Slow response to
acceleration or deceleration
See cause 8 See corrective action for Causes 1-3, 8,
and 9
See cause 11 See corrective action for Causes 1-3, 9,
and 11
12. Low charge pressure See corrective action for Causes 6, 7,
and 9
13. Relief valve dirty or damaged Remove, clean, or replace
Oil leaking from pump or
motor
14. Defective seal Replace seal and/or complete assembly
Problem Possible Cause Corrective Action
Insufficient hydraulic cylinder
power
Relief valve pressure setting decreased
Cylinder internal oil leakage
Cylinder piston or seals defective
Control valve internal oil leakage
Readjust valve pressure setting
Replace seals
Replace piston or seals
Replace entire valve housing
Hydraulic cylinder external oil
leakage
Cylinder seals defective
Cylinder rod damaged
Replace seals
Replace rod
Piston does not move
smoothly
Oil temperature is abnormally high
Air being taken into system
Seals defective
Lower the oil temperature
Replenish oil and tighten suction
connections
Replace seals
Courtesy of Machine.Market
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