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TM 10-3930-644-14&P
MASTS, CARRIAGES AND FORKS
TOPIC 1. MASTS
A. DESCRIPTION
3. Attach  a  suitable  chain  hoist  to  carriage
The conversion of the hydraulic system fluid energy into
assembly.
remove chain anchor pins and
mechanical energy necessary in lift truck operation is
disconnect chains from carriage.
accomplished by the mast assembly.
4. Lower carriage out of bottom of inner mast, and
An EXTRA LIFT mast is available for all models of lift
move to the side, away from work area.
trucks, while the HIGH FREE-LIFT, TRI-LIFT, TRI
Remove chain hoist.
FREE-LIFT and TRI-MAX masts are available for certain
model trucks only.
5. With mast fully lowered, attach a sling from an
overhead crane to the mast lift-eyes to secure
The extra-lift and the high free-lift masts are basically the
entire mast assembly during removal.
same in construction with two structural uprights.  The
difference between the two is the type of lift cylinder
CAUTION
used and its mounting arrangement within the mast
Be certain overhead hoist is rated to
structure. The TRI-LIFT, TRI FREE-LIFT and TRI-MAX
safely
support
mast
assembly
masts consist of a nested assembly of three (3)
weight.
structural uprights (channels) or beams.
CAUTION
All masts but the TRI-LIFT, and some of the larger
Fully retract or lower lift cylinders.
capacity TRI-MAX models, utilize two (2) lift chains for
safety and to minimize off-center loading.  Due to the
6. Disconnect tilt cylinders from outer mast.
operational mechanization, all TRI-LIFT and some of the
larger capacity TRI-MAX masts, make use of four (4) lift
7. Disconnect hydraulic line(s) from lift cylinder(s).
chains. The chain anchors are individually adjustable to
ensure equal tension and a level fork carriage.  The
8. Raise overhead crane high enough to relieve
chains are centrally located so as to offset any bending
pressure on the mast pivot pins. Remove pivot
action on the lift cylinder plunger(s).
pins from mast and lift truck frame; use crane to
lay mast flat on suitable supports with cylinder(s)
Should it become necessary to re-center the mast
(cluster) facing up.
channel uprights for smooth and even sliding, the
following alignment mechanics are provided (adjustment
C. TRI-MAX MAST (CLUSTER TYPE) DISASSEMBLY
method varies with the model and load capacity of mast
AND INSPECTION
employed) : a Wear plates and aligning shims. b Roller
bearings and aligning shims: c Adjusting plugs. Each of
1. Remove the lift cylinder cluster assembly and
these methods of adjustment will be discussed in detail
intermediate lift cylinder assembly (refer to TRI-
in the applicable mast service topics.
MAX CYLINDER CLUSTER REMOVAL Topic).
The removal procedure for all masts is essentially the
2. Remove the cylinder bracket from the top
same and is recommended as outlined as follows.
support on the intermediate mast section, and
disassemble and remove the channel restraint
B. REMOVAL
interlock assembly. (Refer to Figure 1.)
1. Remove the carriage forks.
3. Carefully slide the inner and the intermediate
2. Block the inner mast to give 20" to 24" clearance
mast sections out of the top of the outer mast
between bottom of mast and floor.
section, then remove the inner mast-section
from the intermediate mast section.
NOTE
Remove the capscrews and spacer
form the carriage roller supports, if
applicable.
3-189

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