2021 Continental Cargo Auto Master CARGO TRAILERS 12V DC Power Unit Troubleshooting Guide Owners Manual

General Instructions for 12V DC Systems

1. Check battery voltage. If voltage is 9 volts or less, do not operate power unit. Charge battery to 12 volts.
2. Check to see that the motor is wired correctly to the starter switch and all other control wires have tight connections.
3. Check ground wire for good connection.
4. Check reservoir oil level.
5. Do not tamper with relief valve. It is factory preset to a specified pressure and wired. Cutting this wire voids warranty.

Symptoms

• Unit will not start

  • See causes 1, 2, 7.

• Unit drifts when power is off

  • See causes 3, 4, 5.

• Slow cylinder travel

  • See causes 1, 2, 4, 5.

• Unit will not lower

  • See causes 2, 3.

Probable Cause

1. Improper voltage to motor

   1. See solutions 1, 4, 5.

2. Improper ground

   1. See solutions 1, 6, 7.

3. Improper voltage to valves

   1. See solutions 1, 6.

4. Leakage through solenoid valves

   1. See solutions 3, 4.

5. Internal leakage at cylinder

   1. See solutions 4, 5.

6. Insufficient oil to pump inlet

   1. See solutions 2, 3, 5.

7. Pump seized or locked

   1. See solutions 4, 5.

Possible Solution

1. Check wiring to ensure that all connections are tight.
2. Keep oil reservoir full and clean.
3. Flush and clean cartridge valves and/or hydraulic system.
4. Replace components.
5. Return for necessary repair.
6. Check for clean, tight, metal-to-metal contact on wire connections.
7. Make sure the nut on top of the solenoid valve coil is tightened to 40 in. lb maximum.