Trouble symptom and probable cause
Checking and remedy
1. Gears break off
a. Worn or damaged coupling
b. Loosen nuts or bolts
c. Improperly adjusted linkage
d. Distorted, worn, or crack spring or locking ball
e. Worn shift fork and groove face
f. Worn synchronizer hub and sleeve
g. Worn or damaged synchronizer hub and engagement
sleeve
h. Worn or damaged bearing of input shaft and output
shaft
i. Worn or damaged thrust ring and thrust washer
j. Loosen bolts which mount transmission to engine
a. Replace the coupling
b. Tighten
c. Readjust
d. Repair or replace parts
e. Replace shift fork
f. Replace
g. Replace
h. Replace bearing
i. Replace
j. Tighten
2. Gears hard to mesh
a. High speed idle speed of engine
b. Improper meshing of clutch
c. Coherence of clutch plate
d. Bend clutch slip sleeve
a. Adjust the idle speed
b. Adjust clutch
c. Repair or replace
d. Replace
Transmission trouble shooting
64
HFC1020
series trucks
Trouble symptom and probable cause
Checking and remedy
4. Hard to shift
a. Improper adjustment of shift knob
b. Worn hinge joint or pin
c. Worn control mechanism
d. Loosen bolts or nuts
a. Adjust shift knob
b. Replace
c. Replace
d. Check and tighten
e. Worn or damaged bearing or input shaft or output
shaft
f. Worn or damaged guide bearing of crankshaft
g. Worn cone and cone ring of synchronizer
h. Loose control mechanism or improper adjustment
i. Worn shift lever
j. Improper lubricated knob
k. Insufficient or low viscosity lubrication
e. Replace bearing
f. Replace bearing
g. Replace
h. Tighten or adjust
i. Replace
j. Apply lubrication
k. Fill up or replace
3. Noise from transmission
a. Loosen bolts which mount transmission to engine
b. Worn gear or bearing
a. Tighten
b. Replace
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