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Buffer pad renewal
27 In the event that any of the buffer pads on the mechanism block assembly or the secondary spring
assembly have deteriorated they should be replaced. Remove all traces of the defective pad and adhesive,
ensure both pad and component are free from greasy deposits (use IS Quick Clean) and secure new pads
with Loctite adhesive IS495. Ensure the following conditions are achieved:
27.1 Stop plate-secondary spring (178) pad must be flush with inner edge of stop plate.
27.2 Buffer pad-lower end (182) on adjustment plug (181), rubber buffer-spring carriage (170), buffer
pad on load beam (174) and buffer pad on screw (172) must be positioned concentrically.
27.3 Ensure sound joint is made.
Assemble
28 The secondary spring assembly is assembled as follows (Fig 6.6):
28.1 Lightly apply white bearing grease to shank of screw (172). Avoid applying grease to thread.
28.2 Pass screw (172) shank through load beam (174) and spring guide top (175).
28.3 Fit spring (176) over screw (172) shank and tubular part of spring guide-top (175).
28.4 Screw on spring guide-lower (177) a few turns and then sparingly apply Loctite 221 to screw
thread in free end of spring guide-lower (177). Continue to tighten and adjust until all axial movement of
components is removed without causing any pre-load to spring. This adjustment is critical.
29 The mechanism block assembly is assembled as follows:
29.1 Ensure adjustment shaft bearing (169) is flush with balance mechanism block (166) end face.
29.2 Assemble secondary spring assembly (171) into balance mechanism block (166).
29.3 Retain secondary spring assembly (171) with stop plates-secondary spring (178) and M4 screws
(179) removed at Para 26, ensuring rubber buffers orientated correctly. Lock screws with Loctite 221.
Ensure buffer pads-stop plate (180) are not pinched between stop plate (178) and balance mechanism
block (166).
29.4 Fit adjustment plug (181) and adjust until all axial clearance of components has been removed
without causing any pre-load to spring (176). This adjustment is critical. Secure adjustment plug (181)
with Titanine.
Refit
30 The mechanism block assembly is refitted as follows (Fig 6.6):
30.1 Position mechanism block assembly (12) on lower guide rollers (17) (Fig 6.3) in primary
mechanism (2) ensuring that loading bars (119) and (130) are correctly orientated and engaged with
load beam (174).
30.2 Apply downward pressure to mechanism block assembly (12) and ensure block sits squarely on
all four rollers (17) with no perceptible rock. If block does not sit squarely proceed as follows:
30.2.1 Slacken locking screw (5) (Fig 6.3) at right rear axle position.
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