
110 31200243
Maintenance Section
Boom Cylinder Pin - Lubricate
Illustration 187 g00951662
There is a boom raise cylinder under the boom.
Lubricate the boom cylinder pin through the fitting at the
rod end of the cylinder.
Boom Head Section - Lubricate
Illustration 188 g00950665
Lubricate the boom head through the lubrication fitting.
Boom Pivot Shaft - Lubricate
Illustration 189 g00856576
Location of the pivot shaft for the boom
Illustration 190 g00950677
Lubricate the pivot shaft for the boom through the
lubrication fitting. The lubrication fitting is located on top
of the pivot shaft for the boom.
Boom Telescoping Cylinder Air-
Purge
It may be necessary to purge air from the boom extend
cylinder after the hydraulic oil has been changed. It
may also be necessary to purge air from the boom
extend cylinder after any disassembly of hydraulic
system components.
Normally, the hydraulic system will purge air from the
boom extend cylinder but air can be trapped. Air in
boom extend cylinder can cause erratic boom motion.
1. 1. If necessary, warm the hydraulic oil by raising the
boom and lowering the boom.
Illustration 191 g00837537
2. Retract and lower the boom. Position the machine
on a down slope. Engage the parking brake.
3. Fully extend the boom and retract the boom six
times. This will purge air from the cylinders.
4. Move the machine back to level ground and check
the operation of the boom motion.