SECTION 5 - MAST COMPONENTS
5-2
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5.2 MAST CHAINS AND SEQUENCING CABLES
ADJUSTMENT
Mast Chain/Cable Adjustment
The intention of this procedure is to assure equal load distribu
-
tion between the individual chains of a mast section chain
sets. Also to step each front mast section up approximately 7/
16 in. (12mm) from the section behind it to allow clearance for
the individual mast section covers.
Adjust using the following procedure;
1.
With mast retracted, step into the platform and bounce
your weight up and down a few times to be certain plat
-
form is at the bottom of travel. Be certain all chain/cable
sets are seated in their sheaves properly at the top of
each mast section.
2.
Then with no load in the platform check the side profile
of the top of the mast for the amount of adjustment
necessary to obtain the 7/16 in. (12mm) step for mast
sections-3 and up.
(See Illustration)
NOTE:
Mast section-1 is fixed to the base and mast section-2 is
attached to the lift cylinder, these sections require no
adjustment.
3.
Adjust one mast section at a time starting from the back
(section-3, section-4, etc.)
of the mast and work forward.
(i.e. if three is OK, then jump to four, etc.)
4.
To adjust, elevate the platform until the chain/cable
anchor adjust nuts are accessible at the front and bot
-
tom of each mast section.
NEVER WORK UNDER AN ELEVATED PLATFORM UNTIL
PLATFORM HAS BEEN SAFELY RESTRAINED FROM ANY
MOVEMENT BY BLOCKING OR OVERHEAD SLING.
5.
Start with the mast section which needs adjustment and
loosen the bottom
(jam)
nut on each chain/cable.
6.
Tighten (to raise mast section), or loosen (to lower mast
section) the adjusting nut against the anchor plate on
each chain/cable. Adjust the nut the amount required to
raise or lower the top of the mast section to match the
side profile shown in Figure 5-2. when the mast is
retracted.
NOTE:
It is more important that the (threaded ends) studs pro
-
truding on the adjustments are equal side to side on a mast
section, than it is that the tension in the chains is equal. The
chain equalizers will always assure equal tension, but if the
adjustment isn’t equal as described, the chains may tend to
pull to one side or the other.
The threaded end of the chain/cable may need to be
restrained while tightening the adjust nut to keep the
chain/cable from twisting.
7.
Retract the mast all the way and check if the top of the
mast sections appear as shown in Figure 5-2.
8.
Repeat steps (1) through (7) for remaining mast sections.
9.
Once mast section adjustment is completed, apply
Medium Strength Threadlocking Compound to the
threads under the
(jam)
nuts that were loosened. Then
re-tighten the loosened
(jam)
nuts until tight against the
top
(adjust)
nut. Chain/cable should have slight tension
but should not be taut.
10.
(MSP Only) After all mast adjustments are complete, if
necessary adjust the bumpers on the underside of the
stock-picker platform so the platform rests slightly
above the base frame when it is lowered and empty.
Sequencing Cable Adjustment
1.
Retract mast completely, and check each sequencing
cable on outside of masts for excessive slack. Adjust only
to remove slack from cable.
2.
Tighten nylock-nut just enough to remove excessive
slack from sequencing cable. The springs should not be
compressed more than 25% after adjusting.
3.
Run mast through several cycles to verify cable/chain
adjustments and ensure no interference exists between
chain anchor brackets and mast.
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