Big Joe CB33 - Three Stage Mast Secondary Lift Cylinder Service

BL-CB33-0115 - 03-01-2018 9-9
9-5. Lift Cylinder (Three Stage Mast Secondary)
9-5.1. Removal
1. Fully lower the lift carriage.
2. Turn off the key switch and disconnect the batter-
ies.
WARNING: Before attempting any replacement,
make certain power is disconnected.
3. Remove screw, lock washer and flat washer
securing the top of cylinder to mast.
4. Using another lift truck or suitable jack, raise mid-
dle mast far enough to remove pressure on the
secondary lift cylinder.
CAUTION: Hydraulic oil can damage parts. Wipe off
any oil immediately. Provide a container
under the line or fitting before discon-
necting.
5. Disconnect the tube from the bottom of lift cylin-
der.
6. Support cylinder and remove two bolts, two lock
washers, two flat washers, shims, bracket, clip
and block.
7. Raise lift cylinder assembly up and out of truck.
9-5.2. Repair
CAUTION: To prevent damage, use proper pipe
clamp vise. The cylinder will be distorted
if the vise is tightened too much.
1. Secure the lift cylinder in a vise, clamping lightly
at the base of the cylinder.
2. Remove gland nut.
3. Remove wiper and O-ring from gland nut.
4. Pull out piston rod.
5. Remove collar and piston from piston rod.
6. Remove backup ring and packing from piston rod.
7. Coat all parts with hydraulic oil (Table 3-2).
8. Install packing and backup ring on piston.
9. Remove piston and collar on piston rod.
10. Insert rod in cylinder tube.
11. Install wiper and O-ring on gland nut.
12. Install gland nut in cylinder tube.
9-5.3. Installation
1. Using another lift truck or suitable jack, raise mid-
dle mast far enough to allow installation of the
secondary lift cylinder.
2. Slowly lower mast while aligning cylinder with the
tap on mast.
3. Secure the top of cylinder with flat washer, lock
washer and screw
4. Install clip, bracket, shims, two flat washers, two
lock washers, two bolts and block.
5. Reconnect the tube to the bottom of the lift cylin-
der.
6. Fill the hydraulic reservoir. Use hydraulic oil listed
in Table 3-2.
7. Reconnect the batteries and turn on the key-
switch.
8. Operate the lift and lower buttons to refill the
cylinders and lines with hydraulic oil.
9. Check level of hydraulic oil. If required, add
hydraulic oil to bring to proper level. Use hydraulic
oil listed in Table 3-2.
10. Install the compartment covers as described in
paragraph 5-3.