Table 2-1. Troubleshooting Chart - Continued
Malfunction
Probable cause
Corrective action
e. Fluid viscosity too
e. Completely drain the system. Add new filtered fluid of
heavy to pick up
proper viscosity.
prime
f. Air in system
f. Tighten any loose connections. Bleed air from highest
point in system and replenish fluid.
g. System relief valve
g. Disassemble and clean the valve with solvent. Use
stuck open
pressure gauge to adjust the relief valve
h. Motor binding
h. Remove and disassemble the unit. Check for correct
assembly of parts. Also check for dirt or metal
chips. Clean the parts thoroughly and replace any
damaged parts.
20. Fan Drive Hydraulic
a. Insufficient pump
a. Check pump drive speed.
Motor not Develop-
speed.
ing Sufficient Speed
b. Insufficient fluid pres-
b. Check delivery of pump. Make certain sufficient hyd-
or Torque (Model
sure
raulic fluid is available to the pump.
2385)
c. System overload relief
c. Check pressure and reset relief valve.
valve set too low
d. Motor requiring exces-
d. Remove motor and check torque requirements of
sive torque
driven shaft.
e. Parts of motor cartridge
e. Remove motor for overhaul.
scored due to ex-
cessive pressure or
foreign matter in oil.
21. Fan drive hydraulic
a. Improper port connec-
a. Reverse port connections or shift valve.
motor turning in
tions or control valve
wrong direction
in wrong direction
(Model 2385)
b. Components in system
b. Check complete system for proper operation.
not functioning as
intended.
22. Fan drive hydraulic
a. Air in system
a. Bleed air from highest point in system and replenish
motor noisy (Model
fluid.
2385)
b. Motor internally dam-
b. Remove motor for overhaul.
aged
c. Noise from other sys-
c. Check complete system for proper operation.
tern components tele-
graphing back
through lines and
emerging from motor
23. External leakage
Worn seals or cut "0"
Install new seals and "O" rings.
from motor
rings
24. Motor shaft continuing
Control valve is not
Check control valve for correct spool and leakage.
to rotate when con-
functioning properly
trol is in "Off" posi-
tion
25. (Model 2385) Hyd-
a. Driven in wrong direc-
a. The drive direction must be reversed immediately to
raulic pump not de-
tion of rotation
prevent seizure.
livering fluid
b. Coupling or shaft
b. Disassemble the pump and check the shaft and cart-
sheared or disengaged
ridge for damage. Replace the necessary parts.
Check the drive alignment.
c. Fluid intake pipe in-
c. Check all strainers and filters for dirt and sludge.
reservoir restricted
Clean or replace as necessary.
d. Fluid viscosity too
d. Completely drain the system. Add new filtered fluid of
heavy to pick up
the proper viscosity.
prime
e. Air leaks at the intake
e. Check the inlet connections to determine where air is
Pump not priming being drawn in.
Tighten any loose connections. Replace
seals where necessary. See that the fluid in the
reservoir is above the intake pipe opening. Check
the minimum drive speed which may be too slow to
prime the pump.
2-4
