Harbor Freight Tools 37481 - Manual (Page 7)

Page 7 SKU 37481
Maintenance
The hydraulic cylinder assembly contains hydraulic fluid that must be kept approximately
80% full at all times for proper operation. To check the level and refill, follow these steps.
Note: The hydraulic cylinder has a capacity of 8.4 ounces of hydraulic fluid.
Adding Hydraulic Fluid
1. Turn the Pressure Valve Knob (#6) counterclockwise to allow saddle to lower
completely.
2. Remove the Air Valve (#9) by unscrewing. (Keep screw in a safe place)
3. Visually inspect the inside of the air valve opening. The hydraulic fluid must be 80% of
the capacity of the hydraulic cylinder.
4. Fill with clean hydraulic fluid only.
5. Replace Air Valve.
Bleeding Air from the Hydraulic System
1. Place jack in a clear floor area.
2. Turn the Pressure Valve Knob (#6) counterclockwise to allow saddle to lower
completely and release pressure.
3. Unscrew Air Valve (#9) 1/2 turn counterclockwise.
4. Hold the saddle down while moving the Pump Handle (#11) up and down several
times.
5. Tighten the Air Valve.
Seal Replacement
0-rings and seals can be purchased if you need to have your jack serviced. Take the jack to
a qualified mechanic along with the 0-rings and seals. The Transmission Jack cannot be
user serviced.
REV 09/02 REV 02/04