Filter
Top Products
4 — MAINTENANCE
4-11
Boom Lift Cylinder Removal and Installation
WARNING
Make sure the boom and boom cylinder are securely supported before removing
the boom cylinder. Failure to do so may cause the boom or boom cylinder to fall.
This may cause severe injury or damage to the boom lift.
1. If removing the lower boom lift cylinder, raise the lower boom to just above
horizontal and stand a 36 inch (90 cm) long length of 4x4 hardwood shoring on
the trailer tongue directly below the lower boom rest plate. Lower the boom
onto the shoring. Manually check the stability of the shoring.
2. If removing the upper boom lift cylinder, raise the lower boom about two inches
(50 mm) above the boom rest position.
3. Press in and hold the manual lowering valve at the boom lift cylinder that is to
be replaced. Bleed off all hydraulic pressure to the cylinder.
4. Refer to Figure 4-8. At the piston rod end of the cylinder, unscrew and remove
the keeper pins from both sides of the pivot pin. Thread the removed keeper pin
hardware to the boom for use during cylinder installation.
5. Drive out the pivot pin with a hammer and a brass or hardwood drift. Do not al-
low the free end of the cylinder to fall.
MANUAL
LOWERING
VALVE
PIVOT
PIN
PIN
KEEPER
HYDRAULIC
CYLINDER
VALVE
BLOCK
PIN
KEEPER
UPPER
BOOM
PIVOT
PIN
Figure 4-8. Hydraulic Cylinder Removal