TCM FB15-7 - 7.2.3 TROUBLESHOOTING GUIDE

7. HYDRAULIC SYSTEM
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Problem
PF circuit pressure does not
rise.
The control ow is not a
specied value.
EF circuit pressure does
not rise.
Vibration
Slow pressure rise
PF circuit pressure is
higher than setting.
The control ow is not a
specied value.
Noisy control valve
Oil leaks (external)
Low pressure setting
Oil leaks (internal)
Noisy control valve
Pressure setting rises
Cause
Spool is stuck.
Sliding surface damaged.
Spring broken.
Orice clogged
Relief valve improperly adjusted.
Spool stuck.
Orice clogged
Spool stuck
Insufcient air bleeding.
Spool stuck
Spool stuck
Orice clogged
Relief valve malfunctioning
Relief valve malfunctioning
“O”-ring deteriorated or damaged
Spring defective
Set surface defective
Seat surface damaged
Sliding area too worn
Poppet stuck.
Remedy
Disassemble and clean.
Clean hydraulic oil tank.
Change spool.
Change spring.
Disassemble and clean.
Readjust.
Disassemble and clean.
Disassemble and clean.
Disassemble and clean.
Bleed air out of system.
Disassemble and clean.
Disassemble and clean.
Disassemble and clean.
Readjust.
Readjust.
Change “O”-ring.
Change spring.
Readjust.
Change relief valve.
Correct seat surface.
Change relief valve.
Disassemble and clean.
7.2.3 TROUBLESHOOTING GUIDE
If any problem occurs in the hydraulic system, locate the cause of the problem and take necessary
measures, referring to the tables given below.
(1) Control valve