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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
Summary of Contents for 1448 Plus
Page 4: ...NOTES Courtesy of Machine Market...
Page 12: ...918215 CP0407 8 Printed in U S A INTRODUCTION 1448 PLUS NOTES Courtesy of Machine Market...
Page 16: ...918215 CP0407 12 Printed in U S A CHECKLISTS 1448 PLUS NOTES Courtesy of Machine Market...
Page 18: ...918215 CP0407 14 Printed in U S A CHECKLISTS 1448 PLUS NOTES Courtesy of Machine Market...
Page 25: ...Printed in U S A 21 918215 CP0407 SAFETY Continued L65924 137628 Courtesy of Machine Market...
Page 26: ...918215 CP0407 22 Printed in U S A SAFETY Continued NOTES Courtesy of Machine Market...
Page 56: ...918215 CP0407 52 Printed in U S A SCHEMATICS 1448 PLUS NOTES Courtesy of Machine Market...
Page 75: ...Printed in U S A 71 918215 CP0407 1448 PLUS TROUBLESHOOTING NOTES Courtesy of Machine Market...
Page 76: ...918215 CP0407 72 Printed in U S A TROUBLESHOOTING 1448 PLUS Courtesy of Machine Market...
Page 80: ...918215 CP0407 76 Printed in U S A DECAL LOCATIONS 1448 PLUS NOTES Courtesy of Machine Market...
Page 82: ...918215 CP0407 78 Printed in U S A INDEX 1448 PLUS NOTES Courtesy of Machine Market...