although these do not affect the service procedures that
have been previously described.
6:12 Fault diagnosis
(a) Noisy transmission
1 Excessive backlash of gears in mesh due to gear wear
2 Gears, bearings or gear bushings damaged
3 Shafts misaligned or out of centre due to loose mount-
ing nuts
4 Dirt or metal chips in the lubricant
5 Insufficient oil level in transmission case
(b) Transmission jumps out of gear or gear
shifting is irregular
1 Improper shifting
2 Gear shift lever mounting bracket out of adjustment
3 Incorrect assembly or damage of striker rod positioning
balls and springs
4 Striker rod rollers worn or assembled incorrectly
(c) Oil leakage
1 Overfilled transmission case
2 Front extension, upper cover and clutch housing nuts
loose
3 Speed selector and engagement lever seal at front
extension damaged
4 Faulty bellhousing gasket
5 Gaskets, upper cover-to-case, front extension-to-case,
damaged
6 Damaged axle shaft boot or seal
(d) Transmission shifts hard
1 Defective link of gear shift lever to internal front lever
2 Internal front lever rubber bushing and plates damaged
3 Speed selector and engagement lever control rod
twisted
4 Control rod-to-speed selector and engagement lever
joint damaged
5 Speed selector and engagement lever worn
6 Striker rods binding in casing
7 Sliding sleeves and gears bound in their seats due to
the presence of dirt in splines
8 Improper quality of transmission lubricant
9 Misadjusted clutch linkage and clutch make de-
clutching impossible
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