Lull 6K Service Manual - Manual (Page 261)

Boom and Transfer
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 6-11
2. Install brake pressure diagnostic port test gauge into brake diagnostic
port.
3. While watching test gauge, press brake pedal numerous times until
pressure gauge reads 0 psi. Remove test gauge and cap diagnostic
port.
4. Remove the hose at the base end of the cylinder and plug the hose.
5. Start the engine and activate the control that will supply hydraulic oil to
the rod end of the cylinder.
6. If there is leakage from the disconnected end of the cylinder, remove
the cylinder and make repairs. If there is no leakage, reconnect the
hose and tighten (see installation procedures for each cylinder for
torque specifications).
Boom Hoist Cylinder
Description
Fig. 6-7: Boom Hoist Cylinders
(Ref. Fig. 6-7) Two (2) boom hoist cylinders are used to raise and lower the
boom. They are attached on one end to the outer boom and the other end
is attached to the transfer carriage/boom cradle near the rear of the
operator’s compartment. Daily lubrication of the two grease fittings on
each cylinder is required.
0
80
60 40
20
-20
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