Specifications

RailCorp Infrastructure Engineering Manual – Signalling

Maintenance Manual

Electric Point Machine Westinghouse Style M70 MKIII TMG E1583

4.2.3 Overhaul of Clutch

The cross-section of the friction clutch is shown in Figure 4.2.3.1. Overhaul of the

clutch should be carried out as follows:

1. Measure length of clutch spring before dis-assembling and note this dimension.

2. Remove adjusting nut and clutch spring and slide clutch housing off shaft.

Remove discs and plates, take out small lock screw and use special tool (Figure

4.2.3.2) to remove packing gland nut.

3. Remove old felt packing and clean shaft and inside of clutch housing by washing

with chlorothene. After parts are thoroughly cleaned and dried, a light coating of

lubricant should be applied to shaft at point where new packing is to be applied.

4. Assemble clutch housing on shaft with end of clutch housing meshed in hub of

gear. One new felt packing, should be slipped over the shaft and tamped

securely into the packing gland with the plain end of the special tool. After first

packing has been assembled. A second felt packing should be inserted in same

manner and tamped down.

5. Insert the packing gland nut and tighten using the spanner end of special wrench

until it is flush with bottom of clutch housing. Insert lock screw and tighten

securely.

6. Clutch plates and fabric discs should be thoroughly cleaned with chlorothene to

remove any accumulation of lubricant, inspected for damage and wear and

replaced if necessary prior to reassembly in the order shown in Figure 4.2.3.1. It

will be noted that a fabric disc goes in the bottom of the housing and the first

metallic disc is one with teeth engaging the shaft. The remaining discs and plates

assemble in the order shown.

7. The clutch spring should be adjusted to its original length and finally checked and

adjusted to the correct slip current in accordance with Section 4.2.2.

Issue Date: 1 December 2009 Uncontrolled when Printed