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 490 of 894
TRUCK SERVICE MANUAL
FUEL SYSTEM
CHECK 4 FUEL GAUGE
Cause
Excessive gauge vibration due to machine vibration
carrying through gauge mounts.
Hydraulic pulsations being carried into gauge because of
damping valve not being properly adjusted.
Excessive gauge hand vibration due to improper
damping in gauge line.
Gauge out of calibration
Improper plumbing
CHECK 5 STROKE COUNTER
Cause
Stroke counter improperly set
Stroke counter engagement faulty
Stroke counter fails to disengage.
Stroke counter gears damaged or worn.
CHECK 6 AIR SUPPLY
Cause
Shop air pressure of less than 80 psi (552 kPa).
Air supply on common line with air actuated equipment
which causes intermittent pressure drop.
CHECK 7 AIR SUPPLY GAUGE
Cause
Psi setting does not agree with load test cell reading.
Air gauge hangs up at a certain point regardless of
regulated pressure.
Air gauge is erratic; does not repeat consistently when
actuated several times at same pressure.
Correction
Install new gauge mounts.
Adjust the adjustable damping valve.
Fig.
6-1-116.
With ST1210 or ST768 Master Injector running in the
test stand adjust the needle valve in gauge line until
gauge hand flutter is eliminated but gauge hand is
responsive to any change in pressure.
This adjustment
should be made only with the ST1210 or ST768 Master
Injector and before the machine if calibrated with the
master.
Check with dead weight tester or a master gauge at 120
psi (827 kPa), which is operating pressure.
Adjust dial
hand with adjusting screw.
Make sure plumbing agrees with Fig.
61121.
Do not add extra fittings, lines, etc.
Correction
Counter wheels must be set and locked for correct
number of strokes; the numbers must then be cleared to
"O" by rotating with thumb screw for at least one
complete revolution.
Align counter shaft with drive shaft.
See Fig.
6-1-122.
Increase tension on counter return spring at rear of
panel.
Check visually while holding cover back and correct as
required.
Correction
Supply air pressure of 80 psi (552 kPa) or more.
Rearrange equipment so that ST790 is on a circuit which
has constant air pressure.
Correction
Check both air gauge and load test cell when relationship
between gauge and cell changes by more than 3 psi (21
kPa).
Clean, adjust hand to clear face or replace as necessary.
Check inlet for obstruction, gauge hand for hanging up
and correct or replace as necessary.
485
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