Carriage; Mast - Komatsu AX20 Operation & Maintenance Manual

19. REMOVAL AND INSTALLATION OF ATTACHMENTS
19.3

CARRIAGE

1. Lower the carriage until the forks are resting on the ground.
2. If a side shift carriage is fitted, disconnect the hydraulic hoses at the carriage, draining the fluid into a suitable
container. Plug and seal the opened connections to prevent ingress of foreign matter.
3. Disconnect the lift chains from the carriage and tie the ends of the chain to the outer mast upper cross member.
4. Raise the mast inner section under power until the bottom of the inner section clears the carriage top roller
assemblies.
5. Ensure that the lift chains do not foul during raising.
6. Reverse the truck away from the carriage.
7. Replacement of the carriage is the reverse of the removal procedure. If a side shift carriage is fitted, operate to
both extremes of travel several times to expel air from the system.
19.4

MAST

Prior to removal of the mast, detach the carriage and forks. See paragraph "FORKS" and "CARRIAGE" above.
Remove the drive wheels (if required).
1. With the mast vertical, support the mast securely by attaching lifting tackle to the lifting eyes on the upper cross
brace indicated by the crane hook label. Remove tilt cylinder-to-mast pivot pins.
2. Disconnect hydraulic lines from lift cylinders; blank off all open ends to prevent the ingress of foreign matter.
3. Inclining the mast forward a little from its vertical position, remove the differential mounting cap bolts.
4. Reassembly is the reverse of the removal sequence, noting the following:
a. Renew chain anchor spilled pins.
b. Tighten to the correct torque, the mast locking bolts - see the repair manual for torque figures.
c. Lubricate all pivot pins.
d. If any removal of components affecting tilt angles have been carried out, check and adjust tilt angles. See
the repair manual for further information.
Ensure that all locking devices are engaged upon assembly of attachment.
3-14
Residual oil will be discharged during disconnection.