TM 5-3805-280-24-1
Diagnostic Information
DIAGNOSE HYDRAULIC SYSTEM MALFUNCTIONS
NOTE: Diagnose malfunction charts are arranged from
most probable and simplest to verify, to least
likely and most difficult to verify.
Symptom
Problem
Solution
All Hydraulic Functions Slow
Low oil level
Check oil level in hydraulic oil tank.
Cold hydraulic oil
Heat hydraulic oil.
Oil viscosity too heavy
Use the recommended oil. (See
General Information Section.)
Slow engine speed
Check engine fast and slow idle stop
adjustment at injection pump. Do
Engine Control Motor and Sensor
Adjustment and Engine Speed
Learning Procedure. See Group
9010-20.
Air leak in pump suction line
Check for air bubbles in oil. Tighten
clamps, replace O-rings.
Pilot circuit malfunction
See Diagnose Pilot Circuit
Malfunctions. See Group 9025-15.
9025
15
Restricted pump suction screen
Clean pump suction screen. See
12
Group 3360.
Front and rear pump regulators
Adjust pump regulators. See Group
9025-20.
Worn pumps
Check flow rate using propel cycle
times. Do Hydraulic Pump Flow
Test. See Group 9025-25.
System relief valve setting too low or
Check system relief valve setting.
malfunctioning
See Group 9025-25. Inspect. See
Group 3360.
Circuit relief valve setting too low or
Check circuit relief valve setting. See
malfunctioning
Group 9025-25. Inspect. See Group
3360.
Continued on next page
TX,15,GG2162 1913AUG981/3
6-101
