Governor Trouble

MTB performed maintenance on a marine governor with initial symptoms of severe shaft vibration during pre-overhaul testing. Upon disassembly, the following issues were identified:

• The interior of the governor was extremely dirty, containing water and sludge.
• Shutdown solenoid valve malfunctioned.
• Governor shaft was deeply worn with visible grooves.
• Housing was significantly worn and scratched.
• Power piston was worn.
• Compensating piston was scratched and worn.
• Rollers were in poor condition.
• All seals and packing were damaged, resulting in lube oil leakage.

Maintenance Steps:

• Disassemble, inspect, and clean all components.
• Polish the shaft, pistons, and housing.
• Replace the solenoid valve, seals, and rollers.
• Reassemble and calibrate to verify stability.

Result: After maintenance, the governor operated smoothly with no oil leaks or excessive vibration.