Mariner 100, Service Manual, Page: 229 / 391

6A-5 POWER TRIM 90-13645--2 495
Troubleshooting
Determining if Problem is Electrical or
Hydraulic
When a problem is encountered with the Power Trim
system, the first step is to determine whether the mal-
function is in the “electrical system” or the “hydraulic
system.” Refer to the following chart to determine
which system is at fault.
Engine will not hold a trimmed
position or will not remain tilted for
any extended period.
Engine will not return completely to
“down” position or returns part way
with jerky motion.
Engine will not trim up or down.
Engine trims up, will not trim down.
Engine trims down, will not trim up.
Engine thumps when shifted.
Engine trails out when backing off
throttle at high speed.
Engine will not hold trim position
when in reverse.
Determine if Power Trim
pump motor operates when
appropriate trim circuit is
activated.
Pump motor operates.
Pump motor does not
operate.
Refer to “Hydraulic System
Troubleshooting.”
Refer to “Electrical System
Troubleshooting.”
Trouble Chart