Howden WRV, Service Manual

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9.2 PROCEDURE FOR FITTING LOCKWASHERS
This instruction applies to all lockwashers used on Howden Compressors, for the purpose of
retaining, in position, the locknuts locating the bearings, thrust collars, pistons, etc.
A typical example of the items concerned is shown below (Fig.105).
Assembly method:
In all cases where this type of lockwasher is used, the components must be assembled without the
lockwasher and torqued to the prescribed value. The locknut must then be removed, the lockwasher
dipped in oil and placed on the shaft, the locknut replaced and again torqued to the prescribed value.
This assembly process limits the amount of relative movement between the locknut and the
lockwasher under torque, and avoids the possibility of the inner tank being damaged.