4 — MAINTENANCE
4-5
4-3 HYDRAULIC SYSTEM
Hydraulic system maintenance varies by the amount of use and the environment in which
the lift is used. Constant attention to keep the oil clean and the reservoir properly filled
will help prevent possible damage to the system.
Hydraulic System Inspection
Check the hydraulic hose and fittings for leaks and damage daily. Tighten or replace as
necessary to prevent hydraulic oil loss. Refer to the hydraulic schematic diagram in Sec-
tion 6 for general reference.
Fluid Check and Replacement
The reservoir should be filled to within 1/2 inch of the top with the platform in its lowest
position. The lift is shipped from the factory with Energol HLP-HD46 (BP Oil), a high
grade, non-foaming hydraulic oil designed for temperatures as low as -20°F/-29°C. Use
Dextron Automatic Transmission Fluid Type A for temperatures as low as -40°F/-40°C.
If either oil is not available, a good grade SAE 10W hydraulic oil may be used where the
minimum climatic temperature is above 32°F/0°C. SAE 5W hydraulic oil may be used
where temperatures are as low as 0°F/-18°C. Do not mix different hydraulic oils. Clean
the reservoir sump strainer and replace the hydraulic oil at least once a year or whenever
it becomes contaminated.
Hydraulic System Air Bleeding Procedure
Delayed response or sporadic action in the unit may indicate a presence of air in the cyl-
inder. Perform the following procedure to bleed air from the system.
1. Fill the reservoir with the proper hydraulic fluid.
2. Fully extend the lift.
3. Lower the unit to allow the oil with entrapped air to return to the reservoir, being
careful not to overflow it.
4. Let the unit set while the air escapes the fluid and then repeat if necessary. Each
time the platform is lowered, refill the reservoir to prevent pumping more air into
the cylinder.
