R10032

WS10 - A1

These units have sealed bearings and self lubricating gears.
No grease is required in the gearbox.

The spindle lock can be serviced.
Lever off the button (124) to remove the lock (126). If removed, the button must be replaced with a new one.

The switch (103) can be removed from the support (137) by gently levering at the sides.

The switch / electronic leads (147 or 148) are plugged into the field through the slots in the brush holders (132).

Check the condition of the translucent dust proof diaphragm on the switch. If it is damaged replace the switch.

Electronic versions have an additional lead on the left hand brush which plugs into the front of the module (148).

The switch lever sa (141) is simply pulled from the fieldcase after removing the handle halves (136). The switch lever is not serviceable.

The armature nut (123) has a right hand thread.

The field is retained with two screws (143) located under the brush holders.

QUALITY IMPROVEMENTS.
Upgrading  type A1 to A2
Field - change the field (102), fieldcase (134) and screws (143).  When upgrading the field you must use the new modified fieldcase introduced from week 2796 onwards together with the modified brush holder and brush cover.  These items are available in the kit item 846 shown on the drawing.  
Flange - change the flange (140) and baffle (129). The dampers (130) are not used.
Switch lever - change the lever (141), handle sa (136), button (146) and switch support (137) the spring (142) is not used, and these are available in a kit item 847 shown on type A1.

Upgrading type A1 to A3
Further quality improvements were made in August  1997 (at the time production was transferred to Singapore) changing type A2 to A3.  The parts upgraded are not interchangeable and therefore if you have to replace one of these parts you must replace the other components at the same time.  These items are the fan end bearing (160), gear & pinion (117), and gearcase (119), and all three parts must be changed together when repairing type A1 machines.
The field was also improved to protect it from dust ingress by varnishing the coils.  The field is interchangeable and must be used to repair all types  (see also comments above concerning the fieldcase), and with the new field the seal that was item 148 is no longer required.
The fan end bearing flange (140) was modified to suit the new bearing, and this too is interchangeable.

Type A1 machines requiring major repair may be uneconomical to repair and an exchange  should be considered, providing the customer with the latest quality improved version (A3).