272243 R2 Page 7
Chain Inspection and
Tension
The hoist Chains have been factory lubricated using heat and
pressure to force the lubricant thoroughly into the chain links.
Avoid removal or contamination of this factory applied
lubricant. Do not wash, sand blast, etch, steam clean, or
paint the chains for internal mast installation.
If the mast has been cleaned using a pressure washer or
heavy detergents that may rinse the chain lubrication
out from within the links, then the recommended method
for reestablishing chain lubrication is to soak the chains
in SAE 40wt oil for at least 8 hours, preferably with the
oil heated to 100o F to 120oF to facilitate complete
lubrication penetration. Excess oil can be wiped off prior
toinstallation.
The chains must be adjusted with equal tension to ensure
proper load distribution and mast operation. To determine
equal tension, extend the unloaded mast to put the chains
under tension. Press the center of a strand of chain with your
thumb, then press at the same place on the other chain of the
pair. Each chain in a pair should have equal “give”. If they
do not have equal tension, preform the hoist chain adjust-
ments described below.
Hoist Chain adjustment
SEE SECTION 5.6-3.
Section 2 Installation Instructions
Inspection and
Adjustments
2.4
2.4-1
2.4-2
MA2778.eps
Carriage 2 in.
Below Outer
Upright
Outer Upright
and Carriage
Flush Outer
Upright
*3 in.
Underclearance
*5 in.
Underclearance
*NOTE: Underclearance is based on mast
production series, actual mast
underclearance may vary by truck model.
Figure 5. Upright and Carriage Position.
Upright Rail Lubrication
Lubricate the full length of each upright rail with chassis lube
or Kendall SR-12X as shown in Figure 6.
Load Rollers
Lubricate only where
indicated by the heavy
line for full length
of each upright.
MA3497.eps
Figure 6. Channel lubrication.
2.4-3
