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XLB-4319
4-6
Do not mix hydraulic oils. The reservoir is originally filled with Energol HLP-HD46, a
high-grade, non-foaming hydraulic oil designed for temperatures as low as -20°F (-
33°C). For temperatures reaching -40°F (-40°C), use Dextron Automatic Transmission
Fluid Type A.
If either oil is not available, a good grade SAE 10W hydraulic oil may be used where the
low temperature is above 32°F (0°C). SAE 5W hydraulic oil may be used where low
temperatures reach 0°F (-18°C).
Once a year or whenever the oil becomes contaminated, drain the reservoir, clean the
sump strainer, and replace the hydraulic oil and return filter.
Return Filter Replacement
The hydraulic oil filter should be replaced yearly or whenever filter contamination has a
noticeable effect on the beam lift functions. If return filter clogging is suspected, check
the system hydraulic pressure.
With engine or motor running and no controls actuated, hydraulic system pressure should
be near 0 (zero), or minimal. If the pressure exceeds 30 psig (2 bar) (200 kPa gage), the
return filter should be replaced as follows:
1. Use cleaning cloths and alcohol solvent to clean away dirt on filter cover and
housing (Figure 4-4). Be sure to place reusable components on new cleaning
cloths. Do not allow filter parts to become contaminated.
2. Use a wrench to loosen filter cover.
3. Remove filter cover. Place reusable filter parts on new cleaning cloths.
4. Lift filter element and element holder above reservoir oil level. Drain residual
oil back into filter housing.
5. Remove and discard used filter element.
6. Locate OUT marking on one end of new filter element.
7. With OUT end up, seat new filter element in center of filter holder.
8. Seat filter holder and element in filter housing.
9. Wipe o-ring and mating seal surface of cover with cleaning cloth. If o-ring is cut
or gouged, replace o-ring.
10. Install and hand tighten filter cover. Do not over-tighten filter cover.
Air Bleeding
Delayed response or sporadic boom lift motions may indicate air in the lift cylinders. Use
the following procedure to bleed entrapped air from the hydraulic system.
1. Fill the reservoir with the proper hydraulic fluid. Replace, but do not tighten the
reservoir fill cap.
2. Fully raise and lower the boom to return oil with entrapped air to the reservoir.
3. Allow several minutes for air to escape the reservoir oil.
4. Repeat steps 1 through 3 as needed. Add oil slowly and only when the boom is
lowered to prevent adding more air to the system.