12
I
CHAIN BLOCK
SAFETY OPERATIONS & PARTS MANUAL
CH A IN BL O CK
ASSEMBLY
Consideration must be given to the following when assembling the chain
block:
1. Assemble the brake components
as shown below. The ratchet teeth
must face, as shown and engage
the pawl. Do not lubricate the brake
surfaces. The brake operates dry.
Assemble hand-wheel to pinion
shaft and turn hand-wheel to seat
brake components. Assemble the
pinion shaft nut to the shaft until
the nut bottoms. Then back nut
off at least one but not more than
two flats. Insert cotter pin and bend
ends to secure same.
2. The intermediate gears have
timing marks (letter ‘O’ stamped
on one tooth). The gears must be
assembled with these marks orientated as shown below.
3. For proper operation, the correct number of rollers must be installed at
the rotating points of the liftwheel, intermediate gears.
Refer to Disassembly Instructions (page 11) for the number of rollers
at these locations. Applying grease or equal lubricant to the rollers or
bearing balls will help hold them in position during assembly.
4. When assembling the latch to the hook, the end of the rivet must be
peened over. When peening over the rivet, only apply enough force to form
the head and retain the rivet.
Excessive force will deform the latch and make the latch inoperable.
REEVING LOAD CHAIN
A. 250, 500, 1000, 2000 and 3000Kg Chain Blocks.
Attach approximately 500mm of soft wire to the loose end of the chain.
Pass the wire over the top of the liftwheel and down between the liftwheel
and the chain guide. Position the chain so that the first, as well as the
third, link stands on edge with the weld away from the liftwheel and the
second link lays flat on the liftwheel. After the chain has been started,
pull hand chain in the hoisting direction until about 0.6m of chain has
passed the liftwheel. The wire should now be removed from the chain.
Remove the cotter pin from the loose end pin and slide the loose end pin
to the side into the bear housing leaving approximately 12.7mm of the pin
protruding from the geared side plate. Loop the chain, making sure there
are no twists, up to the loose end pin and slide the pin through the last link
of the chain. Slide the loose end pin into hole in the hand-wheel side plate
until the cotter pin hole is visible. Secure the loose end pin by reinstalling
the cotter pins and spreading the legs of the cotter pins.
5 and 10 tonne chain blocks have multiple falls and are required to be
reeved by Beaver Sales or our authorised dealers only.
WARNING
Failure to properly
install the load chain
between guide and
liftwheel may cause the chain to lift out of the
liftwheel pockets and allow the load to drop.
TO AVOID INJURY
Feed load chain between liftwheel and chain
guide as shown above before attaching it to
the loose end pin.
Ratchet
Ratchet
Friction
Washer
Friction
Hub
Pawl
Intermediate
Gear
Timing
Marks
Loose
End Pin
Chain
Guide
Liftwheel
Ratchet
Ratchet
Friction
Washer
Friction
Hub
Pawl
Intermediate
Gear
Timing
Marks
Loose
End Pin
Chain
Guide
Liftwheel
MAINTENANCE
