Oildyne 108 series Start Up Instructions - WIT
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Oildyne 108 series Start Up Instructions

By W Contributor  –  Published 4/21/2010
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I have not used my Oildyne 108 series Compact Hydraulic Power Unit for a while, how do I start it properly?

Because Oildyne 108 series power units are not self-priming, it is important to follow start-up instructions for long term unit performance. Oildyne 108 Series HPUs are found on many campers, boats, and recreation vehicles and after winter storage, remember to follow these instructions.

Installation and Start-Up Procedures
  1. Mount the unit securely in a vertical position with the motor up. (Unless the unit was ordered specifically as a horizontal mount.)
  2. Wire the motor using the appropriate wiring diagram at the end of the attached document. If your motor code is not shown, call WIT for assistance.
  3. Fill the reservoir with automatic transmission fluid or any clean hydraulic oil with a viscosity range of 150-300 SSU at 100° F. NOTE: Choose a hydraulic fluid having a viscosity index that is suitable for the climatic conditions in which the unit will be operated. Recommended operating temperature range is +20° F to +180° F. Call WIT for special low temperature pumps.
General Start-up Instructions
NOTE: The ports are marked on the casting ‘UP’ and ‘DN’.
  1. When facing the power unit with the motor up, plug the right-hand, or ‘DN’ port.
  2. Jog the motor until oil flows from the left-hand, or ‘UP’ port. If oil does not flow from the ‘UP’ port, reverse the wire leads on the motor, and repeat. The pump is now primed.
  3. Connect the hose (or tubing) to the ‘UP’ port and tighten.
  4. Connect the other hose end to the blind end (the side of the piston that is opposite the rod) of a fully retracted hydraulic cylinder.
  5. With the hose fitting loose, operate the power unit until oil (and no air) bleeds from the fitting.
  6. Tighten the fitting.
  7. Refill the reservoir.
  8. To complete the system start-up, consult the following specific circuitry instructions appropriate for your version of power unit. If you do not know what type of power unit you have or do not see your type below, call WIT for assistance.
Single Direction Power Units
  1. Follow the general start-up instructions.
  2. Either
    • When using an externally mounted directional control valve (DCV), connect the tank port of the DCV to the ‘DN’ port of the power unit.
    • If using an externally mounted two-way release (dump) valve, tee the valve into the pressure line and plumb the oil return line to the ‘DN’ port.
  3. Cycle the system a few times to ensure the air is out of the circuit.

Reversible Power Units
  1. Follow the general start-up instructions.
  2. Run the power unit in the ‘UP’ port rotation (same direction as previously run). Continue until the cylinder rod is fully extended, adding only enough fluid to the reservoir to get the cylinder extended. (Adding too much oil at this point could cause the reservoir to overflow when the cylinder rod is retracted.)
  3. Remove the plug from the ‘DN’ port and connect one end of the second hose to it, then tighten.
  4. Jog the power unit in the ‘DN’ port rotation (opposite direction of earlier), until oil (with no air) flows from the loose hose end.
  5. Connect and tighten the hose end onto the rod end cylinder fitting.
  6. Operate the power unit to fully retract the cylinder.
  7. Once retracted, check the oil level in the reservoir and add as needed to maintain full capacity.
Reversible Power Units used with Single Acting Cylinders
  1. Follow the general start-up instructions.
  2. Operate the power unit in the same direction as earlier to extend the cylinder fully.
  3. To retract, reverse the electric motor rotation. The cylinder will retract due to the load on the rod, or due to the use of a spring return type cylinder. NOTE: The power unit itself will not retract the cylinder. Retracting relies solely upon external forces acting on the cylinder rod, such as a spring or load.

WIT’s service department is ready to help if you have any questions, give us a call

These instructions are courtesy of the Parker Oildyne Division and their April Oildyne Times.