Calibrating Mechanism - Dismantling - Liquid Controls Avery-Hardoll BM Series Maintenance Manual And Parts List

BM BULKMETER
6

CALIBRATING MECHANISM - Dismantling

6.1 Although operational failures of the calibrating mechanism are rare, it is recommended that, if
possible, any necessary repairs are carried out without the removal of the calibrating adjustment
mechanism. If dismantling is found necessary refer to Fig 5.5.
6.2 Remove the locking wire from the two sealing screws (55) securing the register (58) to the calibrating
mechanism base (1). Remove the two remaining screws (56) and washers (57) and lift off the
register.
6.2 From the rear of the base, tap out the two dowel pins (15) which locate the calibrating gear
bracket (12).
6.3 Lay the calibrating mechanism on its back and remove the three cap head screws (13) and washers
(14) securing the gear bracket to the base (1).
6.4 Carefully lift the gear bracket, complete with calibrating adjustment mechanism and gear wheels clear
of the base, recover the planet gear (21) and balance weight (22) which are a loose fit in the planet
wheel carrier assembly (20).
6.5 Remove the retaining nut (41) from the calibrating screw (40). Slacken the clamping screw (42) fitted
to the lug of the gear bracket (12).
6.6 To aid adjustment on re-assembly, note the number of calibrating screw threads (40) protruding
through the end lug on the bracket and the angular position of the screwdriver slot. Remove the
calibrating screw.
NOTE:
The end of the calibrating screw incorporates the small ball race. If the ball race is unserviceable
the calibrating screw and ball race must be replaced.
6.7 Withdraw the worm shaft (37) complete with friction roller (38).
6.8 Further dismantling of components is straight forward, involving the removal of tension pins and
screws.
SERVICING
TP0003B
Chap 5
Page 7