TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 371 of 894
TRUCK SERVICE MANUAL
Service Tools (Or Equivalent) Required
ST-195
Plug Gauge
ST-249
Mandrel and Block
3T-970
Plug Driving Mandrel
ST-1053
Plug Driving Mandrel
Standard Tools Obtain Locally
Small Bore Gauge
Micrometer (o to 1 inch)
Micrometer (1 to 2 inch)
Feeler Gauge (0.006 inch
[0.15 mm])
CAM FOLLOWERS
DISASSEMBLY AND INSPECTION
1. Remove lockscrews holding shafts in housing
and cup plug by using a sharp pointed chisel.
Using
proper mandrel press both shafts out opposite end
forcing remaining cup plug out of hole.
Mark or tag cam
follower levers for position before removal.
2. Remove cam follower levers from housing.
Clean other parts in solvent.
3. Measure outside diameter of shafts with
micrometers.
If worn smaller than 0.748 inch [19.0 mm]
mark for replacement.
4. Check cam follower shafts around lockscrew
end to make sure grooves are clean, inspect cam
follower housing for
cracks
or
mating
surface
imperfections.
Discard unserviceable parts.
5. Check cam follower bushings for scratches,
pitting or scoring.
Check bushing inside diameter with
micrometers.
If worn larger than 0.7515 inch [19.088
mm] mark for replacement.
6. Check for surface imperfections by magnetic
inspection.
Apply coil magnetization, amperage at 300 to
500 with residual Magnaglo.
7. Inspect edges of cup plug holes in cam follower
housing for sharp edges or nicks.
If damaged, chamfer
entrance of hole to form a slight radius and break sharp
edges to aid installation of cup plug.
8. Cam follower levers have a removable insert (3,
Fig. 4-2).
These must be replaced if scored or extremely
worn.
Check with a new push tube ball or 0.625 inch
[15.88 mm] checking ball and Prussian Blue.
This area
must "blue in" 80% blue or insert must be replaced.
9. Remove cam roll pins (5), roller pins (4) and
rollers (6) from cam follower levers (2).
10. Inspect cam rollers.
Set small bore gauge
0.0002 inch
[0.005 mm] above worn replacement limit listed in Table
4-1.
Use as a "No-Go" gauge in bore to check wear
beyond replacement limits
Check for out-of-round holes.
New dimensions on injector cam rollers are 0.503 to
0.504 inch [12.78 to 12.80 mm].
Worn replacement limit
is 0.505 inch [12.83 mm].
On valve cam rollers new
dimensions are 0.5005 to 0.5015 inch [12.713 to 12.738
mm].
Worn replacement is 0.503 inch [12.78 mm].
If
rollers do not meet these specifications, mark for
replacement.
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