mthieme
Captain
- Joined
- Oct 6, 2007
- Messages
- 3,270
Information is for OMC Cobra.
Find your symptom(s). Note numbers just below symptom(s).
Page down to find corresponding procedure(s) and solution(s).
SYMPTOMS
Static Leak Down and/or Trim-In Creep in Forward Gear
3-5-4-6-17
Trim-Out/Tilt-Up Creep in Reverse Gear (no Reverse Lock)
8-9-6-17
Leaking Both Up and Down (Trim In/Out Creep)
7
Slow or No Trim-Out/Tilt-Up, Motor Runs
1-3-4-5-6-7-8-11-12
No Trim-Out/Tilt-Up, Motor Does Not Run
16-13-14-15
Slow or No Trim-In/Tilt-Down, Motor Runs
1-5-6-8-9-10-3-12
No trim-In/Tilt-Down, Motor Does Not Run
16-13-14-15
No Trim-In/Tilt-Down, Motor Runs
1-12-3
No Trim/Tilt Up or Down, Motor Runs Fast
12
No Trim/Tilt Up or Down, Motor Does Not Run
13-14-15-16
No Tilt-Down from Full Tilt-Up Position, Motor Stalls
4
Erratic Operation, Jumpy Motion, Pulsing/Hissing Fluid Sound
2
Continual Use or Loss of Hydraulic Fluid
17
PROCEDURES
1 - Air or Low/No Oil in Reservoir. Fill Reservoir and cycle trim/tilt unit.
2 - Air in hydraulic system. Cycle unit through entire range three to five times. Fill reservoir
3 - Manual release valve loose or leaking. Tighten to a torque of 45-55 IN/LBS. Remove and check the condition of the plastic O-rings and seats. They can not be worn or damaged and must be free of dirt or foreign particles.
4 - Thermal Expansion Valve sticking or spring damaged. Dirt under check ball.
5 - Trim-Out/Tilt-Up piston sticking, damaged seal tip, dirt under seal, leaking O-ring, or damaged spring.
6 - Pump control piston sticking or dirt under check balls or in small oil passages in control piston. Check piston condition, working surface in vavle body, check ball seat and oil passage holes.
7 - Trim/Tilt cylinder internal leak - piston seal or impact relief vavles damaged, dirt under relief vavles.
8 - Trim-In/Tilt-Down check valves sticking, damaged seal tip, dirt under seal, leaking O-ring, or damaged spring.
9 - Manual release check ball leaking. Check for damage to ball or seat, remove dirt.
10 - Trim-In relief valve leaking. Check seal tip condition, seat condition, and spring. Check for evidence of sticking or presence of dirt. Seal tip can be serviced.
11 - Tilt-Up relief valve leaking. Check for valve sticking, damaged seal tip, dirt under seal, damaged spring, or valve body O-ring damage.
12 - Pump coupling broken. See if pump turns freely. Check motor for bent shaft. Pump binding. Check for dirt, mechanical damage.
13 - Blown 50-Amp fuse or tripped ciruit breaker. Replace fuse or reset circuit breaker.
14 - Motor inoperative. Bench test Tilt/Trim motor.
15 - Relay control box malfunction.
16 - Switch circuit malfunction. Test Trim/Tilt switch.
17 - External oil leak. Check all hydraulic lines and connections, cylinder rods and seals, valve body to motor O-ring, valve seals in valve body.
NOTES
Other separate (test) procedures exist to bench test the Trim/Tilt Motor, Trim/Tilt switch, and disassemble the valve body.
An In-Line pressure tester (OMC part number 983977) provides a method of testing the performance of the Trim/Tilt unit. This can measure pressure leak-down, stall pressure and running pressure. It can also isolate the cylinders from the valve body to locate a component causing leak-down.
A separate procedure exists to further testing of the Trim/Tilt system using an In-Line pressure tester.
Find your symptom(s). Note numbers just below symptom(s).
Page down to find corresponding procedure(s) and solution(s).
SYMPTOMS
Static Leak Down and/or Trim-In Creep in Forward Gear
3-5-4-6-17
Trim-Out/Tilt-Up Creep in Reverse Gear (no Reverse Lock)
8-9-6-17
Leaking Both Up and Down (Trim In/Out Creep)
7
Slow or No Trim-Out/Tilt-Up, Motor Runs
1-3-4-5-6-7-8-11-12
No Trim-Out/Tilt-Up, Motor Does Not Run
16-13-14-15
Slow or No Trim-In/Tilt-Down, Motor Runs
1-5-6-8-9-10-3-12
No trim-In/Tilt-Down, Motor Does Not Run
16-13-14-15
No Trim-In/Tilt-Down, Motor Runs
1-12-3
No Trim/Tilt Up or Down, Motor Runs Fast
12
No Trim/Tilt Up or Down, Motor Does Not Run
13-14-15-16
No Tilt-Down from Full Tilt-Up Position, Motor Stalls
4
Erratic Operation, Jumpy Motion, Pulsing/Hissing Fluid Sound
2
Continual Use or Loss of Hydraulic Fluid
17
PROCEDURES
1 - Air or Low/No Oil in Reservoir. Fill Reservoir and cycle trim/tilt unit.
2 - Air in hydraulic system. Cycle unit through entire range three to five times. Fill reservoir
3 - Manual release valve loose or leaking. Tighten to a torque of 45-55 IN/LBS. Remove and check the condition of the plastic O-rings and seats. They can not be worn or damaged and must be free of dirt or foreign particles.
4 - Thermal Expansion Valve sticking or spring damaged. Dirt under check ball.
5 - Trim-Out/Tilt-Up piston sticking, damaged seal tip, dirt under seal, leaking O-ring, or damaged spring.
6 - Pump control piston sticking or dirt under check balls or in small oil passages in control piston. Check piston condition, working surface in vavle body, check ball seat and oil passage holes.
7 - Trim/Tilt cylinder internal leak - piston seal or impact relief vavles damaged, dirt under relief vavles.
8 - Trim-In/Tilt-Down check valves sticking, damaged seal tip, dirt under seal, leaking O-ring, or damaged spring.
9 - Manual release check ball leaking. Check for damage to ball or seat, remove dirt.
10 - Trim-In relief valve leaking. Check seal tip condition, seat condition, and spring. Check for evidence of sticking or presence of dirt. Seal tip can be serviced.
11 - Tilt-Up relief valve leaking. Check for valve sticking, damaged seal tip, dirt under seal, damaged spring, or valve body O-ring damage.
12 - Pump coupling broken. See if pump turns freely. Check motor for bent shaft. Pump binding. Check for dirt, mechanical damage.
13 - Blown 50-Amp fuse or tripped ciruit breaker. Replace fuse or reset circuit breaker.
14 - Motor inoperative. Bench test Tilt/Trim motor.
15 - Relay control box malfunction.
16 - Switch circuit malfunction. Test Trim/Tilt switch.
17 - External oil leak. Check all hydraulic lines and connections, cylinder rods and seals, valve body to motor O-ring, valve seals in valve body.
NOTES
Other separate (test) procedures exist to bench test the Trim/Tilt Motor, Trim/Tilt switch, and disassemble the valve body.
An In-Line pressure tester (OMC part number 983977) provides a method of testing the performance of the Trim/Tilt unit. This can measure pressure leak-down, stall pressure and running pressure. It can also isolate the cylinders from the valve body to locate a component causing leak-down.
A separate procedure exists to further testing of the Trim/Tilt system using an In-Line pressure tester.