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MAST LOCK INSPECTION & ADJUSTMENT INSTRUCTIONS
All SwapLoader hook-lift hoists come with a mast lock (safety latch) assembly that is located on
the bottom side of the outer tube. When the jib is extended the mast lock then engages the latch
bars (forks) on the pivot joint, making the jib, outer tube, and pivot joint into a continuous
member for raising the container or body up into a dump mode.
With the jib fully retracted the mast lock then disengages the latch bars on the pivot joint
allowing the hook-lift to enter into the mount-dismount cycle by pivoting around the front pins
of the pivot joint. A properly adjusted mast lock will function smoothly and clear the latch bars
on the pivot joint approximately a 1/4" (see illustrations below).
INSPECTION
The mast lock assembly comes adjusted from the factory and should provide years of trouble
free operation, however there may come a time when an adjustment may be required. Prior to
making any adjustments, SwapLoader recommends that you begin with inspecting all mast lock
components for damage or wear (see illustrations below).
First inspect the adjustment tube and bolt on the jib; make sure nothing is missing or bent. Next,
inspect the release lever and connection bar on the outer tube; look for any missing or bent
components such as ears or pins. Finally, inspect the safety latch (see illustration below); again
make sure there are no missing or bent components such as ears, pins, or latches. Repair or
replace any missing or bent components prior to making any adjustment to the mast lock
assembly; refer to the mast lock (safety latch) assembly drawing for proper part numbers and
identification of the components (See Drawing No. 10H40 in the Part List pages of the manual).
Jib Weldment
Adjustment Tube
Release Lever
Connection Bar
SL-145.MAI
07/2009
100 & 200 SERIES HOISTS
Jam Nut
Spring Take Up
Adjustment Bolt
Safety Latch
MAST LOCK LOCATION AND ADJUSTMENT ILLUSTRATION
(shown with the jib retracted)
Outer Tube
Weldment
Latch Bar
1/4" Clearance
Pivot Joint
Weldment
4-7
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