TOHATSU BFT75A Service Manual page 138

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POWER TRIM/TILT DOES NOT HOLD POSITION
1. Manual valve inspection
Check the manual valve tightness.
Is the manual valve tight?
YES
NO
2. Oil leak inspection
Check for oil leakage from the power trim/tilt.
Is there oil leakage?
YES
NO
3. Hydraulic pressure inspection
Check the hydraulic pressure (page 18-38).
Is the hydraulic pressure within the specification?
YES
NO
4. Oil level inspection
Check the oil level with each rod fully extended.
Is the oil level within the specification?
YES
NO
5. Air bleed system inspection
Check for air in the system.
Air in the system?
YES
NO
POWER TILT MOTOR DOES NOT OPERATE
1. Power tilt motor inspection
Connect the battery to the power tilt motor and check whether the motor operates.
Does the motor turn?
YES
NO
2. Power tilt relay inspection
Check the power tilt relay (page 10-15)
Is the power tilt relay normal?
YES
NO
3. power trim/tilt switch inspection
Check the power trim/tilt switch (page 10-16)
Is the power trim/tilt switch normal?
YES
NO
– GO TO STEP 2.
– Tighten the manual valve to the specified torque: 3.4 N·m (0.35 kgf·m, 2.5 lbf·ft)
– Replace the O-ring and oil seal at the leaking point (when the manual valve O-ring or piston rod
(cylinder cap) oil seal are leaking, replace it as an assembly).
– GO TO STEP 3.
– GO TO STEP 4.
– Replace the pump and recheck.
– GO TO STEP 5.
– Fill the oil to the specified level.
– Bleed air from the system (page 18-36)
– Power trim/tilt faulty.
Repair the faulty part by referring to the "POWER TRIM/TILT QUICK
REFERENCE CHART (page 4-27).
– GO TO STEP 2.
– GO TO STEP 4.
– GO TO STEP 3.
– Replace the power tilt relay with a new one and recheck.
– Repair the main wire harness or replace it.
– Replace the power trim/tilt switch with a new one and recheck.
TROUBLESHOOTING
4-25