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 132 of 894
BREAKS-AIR
TRUCK SERVICE MANUAL
Air Strainer
Wash curled hair from air strainer in cleaning
solution and then saturate it with clean oil, squeezing out
excess oil before replacing it in air strainer.
Ball Bearings
All ball bearings must be cleaned thoroughly in
cleaning solvent.
INSPECTION OF PARTS
Cylinder Head Body
I
Inspect cylinder head body for cracks or breaks.
Replace if any defects are found.
Water Passages
Test water jacket of cylinder head and cylinder
block for leakage, using air pressure.
Replace unit if
leakage is found.
Discharge Valve Springs
Discard all used discharge valve springs and
replace with new springs.
Discharge Valves and Seats
Inspect condition of discharge valves and
discharge valve seats.
If discharge valves are grooved
deeper than .
003" where they contact the seats, they
should be replaced.
If the discharge valve seats are
worn excessively so there is no longer sufficient metal
left to reclaim the seat by using a lapping stone, the
seats should be replaced.
Crankcase and End Covers
Check crankcase and end covers for cracks and
broken lugs.
Replace if any damage is found.
End Covers
If an oil seal ring is used in the end cover, check fit
of ring in the ring groove and have .008" to .015"
clearance at the gap when placed in the end bore of the
crankshaft.
Check oil seal ring for wear.
If worn thin or
damaged, the oil seal ring must be replaced.
Inspect oil
ring groove in end cover.
If ring wear has formed a step
pattern in groove, replace end cover or machine groove
for
next
oversize
oil
seal
ring.
Crankcase Bearing Bores
Check fit of ball bearings in crankcase. Bearings
must be a finger press fit.
If crank-case bearing bores
are worn or damaged, the crankcase should be replaced.
Cylinder Block Check for cracks or broken lugs on
cylinder block.
Also check unloader bore bushings to be
sure they are not worn, rusted or damaged.
If these
bushings are to be replaced, they can be removed by
running a 1/8" pipe thread tap inside the bushing, then
inserting a 1/8" pipe threaded rod and pulling the bushing
straight up and out.
Do not use an easy-out for removing
these bushings.
Inlet Valve and Seats
Inspect condition of inlet valves and seats.
If inlet valves are grooved deeper than .003" where they
contact the seat, they should be replaced.
If the inlet
valve seats are worn or damaged so that they cannot be
reclaimed by facing or lapping, seats should be replaced.
Cylinder Bores
Check cylinder bores for evidence of excessive
wear, out of round, or scoring.
Cylinder bores which are
scored or out of round more than .
002", Fig.
6, or
tapered more than .
003", as should be re-bored or
honed oversize.
Oversize pistons are available in .010",
.020" or.
030" oversize.
Cylinder bores must be smooth,
straight and round.
Refer to specifications for proper
clearance between piston and cylinder bore.
Aluminum
pistons are cam ground.
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