SECTION 4 - HYDRAULICS
4-40 – JLG Lift – 3121642
Oscillating Axle Cylinder Bleeding Procedure
1. Start the engine.
2. Raise the arms high enough so that the left axle cylinder
bleeder valve can be accessed.
3. Let engine run at idle.
4. Position a suitable container [approx 0.5 gal (1.9 ltr)]
over the bleeder valve.
5. Using a 3/8" wrench, slowly open bleeder valve.
6. Keep the container close enough to the bleeder valve to
catch the aerated oil.
7. Open the bleeder valve enough to get a fast stream of
oil.
NOTE: A fast stream of oil will exhaust the air out of the hoses and
cylinder better than a slow stream of oil.
8. Every 3-4 seconds, close the bleeder valve so that a
slower stream of oil is being purged. When only oil and
no air is being purged, close the bleeder valve.
9. A new system can take 10-15 seconds per cylinder to
bleed.
ANYTIME EITHER OF THE HOSES PLUMBING TO THE CYLINDERS ARE BROKEN
INTO, AIR HAS BEEN INTRODUCED INTO THE SYSTEM. THE CYLINDERS MUST
BE BLED.
1. Oscillating Axle Cylinder 2. Bleeder Valve
Figure 4-35. Oscillating Axle Cylinder Bleeding
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