Tiger TCB Series Original Instruction Manual page 21

Your TCB or SS12 chain block may have been supplied with a load limiter, if this has been requested at the time of order.
The load limiter (C-40) is fitted to prevent hoist overload. The device consists of items LM1-LM9 and operates by limiting the
amount of torque transmitted by the hand chain wheel. It is independent of the hoist brake.
If a load limiter is fitted, items LM1-7 and LM9 replace the standard hand chain wheel (C-28) and item LM8 (R clip (or split pin
for 0.5t and 1.0t capacity units)) replaces the cotter/split pin (C-32) in the check nut. See Chapter 13 for explosion diagrams of
chain blocks without load limiters and for the explosion diagram and parts list for the load limiter.
To set the load limiter:
If the load limiter components have been disassembled, they will need to be reassembled (as a C-40) as in the diagram above.
1. Place the assembled load limiter on the pinion shaft (C-07), in place of the standard hand wheel (C-28)
2. Tighten the castle/check nut (C-31) and insert the LM8 (R clip (or split pin for 0.5t and 1.0t capacity units)) as
described in Chapter 5 – Inspection/Check the brake function Figure 1.
3. Fit the hand chain.
4. Suspend the chain block from a test machine, with a load cell in line to monitor the load.
The overload protection device is normally set to engage when a load of approximately 135% (±10%) of the WLL is lifted,
unless otherwise specified during purchasing. Determine what your target overload limit is for the unit before you begin to set
the overload mechanism.
5. A weight greater than the target load limit is required on the test bed to set the load limiter.
6. With the limiter set open (and LM6 tabs flat) start operating the hand chain in a clockwise direction.
7. The load limiter will start to slip when tension in the load chain has been applied.
8. Holding both sides of the hand chain in one hand to lock the hand wheel, use a load limiter tool to start tightening
the locking nut (LM7).
9. Operate the hand chain again until the load limiter slips, observing the load cell reading as the load increases.
10. Repeat the process of tightening (LM7), as in steps 8 and 9, and the load will increase in increments until the target
overload limit is showing on the load cell without any slippage.
11. Once the target load has been established lower and reload the hoist up to 10 times to ensure consistent readings.
12. One tab on the tab washer (LM6) will then need to be bent into a recess on locking nut (LM7) to secure the settings of
the mechanism.
13. Operate the hoist up and down, lifting and lowering the load, to ensure the target overload is being consistently
maintained.
14. Check that the hoist is operating correctly and refit the covers.
Depending on loads lifted or frequency of use, overload limiters will need to be reset from time to time.
Hooks
Lubricate the hook shank, the head within the hook yoke and the hook latch pivot points with the same lubricant used on load
chain.
Pawls
When the chain block is disassembled for periodic inspections, check the C-25 pawls for
free movement and apply a light coat of grease to the pawl shaft. Make sure that the pawl
springs are seated correctly around the pawls and mounting points. The pawls should fully
engage into the ratchet gear teeth in the correct orientation as in this image. Newer
versions of the hoist have a dimple indicator on the pawl. The pawl is fitted with the dimple
facing you.
Unit 1, Greensfield Industrial Estate,
Willowburn Avenue,
ALNWICK, NE66 2DG
Email: info@tigerlifting.com
www.tigerlifting.com
www.tigerlifting.com
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Manual Tiger TCB-SS12 En 201605 v3.1