The Nokken Winch Model R1BJ.

The Nokken is a Norwegian winch normally used in forestry, and manufactured by Hordaland Mek. Approximately 20% of the 101" vehicles, except ambulances, were fitted with these winches as far as I know. This winch is more versatile than others. The cable can be lead to the front or rear of the vehicle. With a cable length of 65 metres, it is twice as long as normally found on an electric drum winch. Winching speed is variable, depending on gearbox, transfer gear and throttle settings. Being a capstan winch, the cable load is constant, unlike an electric drum winch which is dependent upon how much cable is on the drum and upon the state of the battery.

Important Points:

1. A minimum of 5 wraps of cable on the take up drum should be maintained when winching. Mark the cable with paint or plastic tape so that it can be seen from the driver's seat.
2. Initial winch load can exceed that to which the winch was originally set due to corrosion, temperature etc.
3. This winch should not be used for lifting. Legal requirements apply in this situation.
4. Cable should be checked prior to load setting and any use. Replace it if there are any signs of damage, wear or corrosion.
5. The cable should be cleaned, checked and re-greased prior to load setting and any trip where winching may be required.
6. Use EP90 gear oil to lubricate winch moving parts.

Setting the Winch:

The winch clutch on a forward control 101" is adjusted to ensure slippage between 2100 and 2200 kilogram force by delivery on cable load. This is checked by the following process:

Remember that winching is dangerous and operators need to be well protected.

Two people are required. Connect a load cell or strain gauge to a sturdy tree via a strap or chain. The instrument's scale must exceed the requirements (2200kgf). The winch cable from the vehicle is connected to the load cell. The person reading the load cell should be protected by another vehicle or heavy barrier. The person adjusting the winch clutch will be protected by that vehicle. Operate the winch as described in the Military User Handbook, optional equipment section page number 173--, to release approximately 75% of the cable. Select first or second gear. Use the vehicle brakes to slowly increase the vehicle load until the winch clutch slips (vehicle stationary). A jerking motion indicates the winch clutch is slipping. If the load reading on the load cell exceeds 2200 kilograms, stop winching and reduce the clutch load. If the load reading fails to reach the 2200 kilogram mark, stop winching and increase the clutch load. This is adjusted by rotating the adjusting nut (lock-nut on storage drum shaft). Clockwise to tighten and increase the load. Anti-clockwise to loosen and decrease the load. Note the adjustment in the critical area can be rapid! Only adjust the nut one flat at a time.

- Rod Genn © 1996

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