Ingersoll-Rand 7120 - Manual (Page 68)

FAULT FINDING
65
7/120 (P425AWIR), 9/110 (XP375AWIR), 10/105 (HP375AWIR), 14/85 (VHP300AWIR),
7/170 (P600WIR), 10/125 (HP450WIR), 14/115 (VHP400WIR)
FAULT CAUSE REMEDY
No reaction
from
instrument Batteries not
connected. Connect batteries.
panel when
key turned
to
(I)
position.
Fuse at starter motor
‘blown’. Replace fuse.
Engine fails
to start. Low battery charge. Check the fan belt
tension, battery and
cable connections.
Bad earth
connection. Check the earth
cables, clean as
required.
Loose connection. Locate and make the
connection good.
Fuel starvation. Check the fuel level
and fuel system
components.
Replace the fuel filter
if necessary.
Relay failed. Replace the relay.
Faulty stop solenoid Check the stop
solenoid
Engine
stops while
in service or
is reluctant
to start. Low fuel level. Fill fuel tank and bleed
air from fuel system if
necessary. (Refer to
MAINTENANCE
SECTION).
Safety shut-down
system in operation. Check the safety
shut-down switches.
Engine
starts but Electrical fault Test the electrical
circuits.
stalls when
the switch
returns to
Low engine oil
pressure. Check the oil level
and the oil filter(s).
position I.
Faulty relay Check the relays.
Faulty key–switch Check the
key–switch.
Engine
starts but
will not run Electrical fault. Test the electrical
circuits.
will not run
or engine
shuts down
prematurely.
Low engine oil
pressure. Check the oil level
and oil filter(s).
Engine
starts but Safety shut-down
system in operation. Check the safety
shut-down switches.
will not run
or engine
shuts down
prematurely.
Fuel starvation. Check the fuel level
and fuel system
components.
Replace the fuel filter
if necessary.
Switch failure. Test the switches.
High compressor oil
temperature. Check the
compressor oil level
and oil cooler. Check
the fan drive.
Water present in fuel
system. Check the water
separator and clean if
required.
Faulty relay. Check the relays and
replace if necessary.
Engine
Overheats. Low water level Check the level and
replenish if
necessary.
Blocked radiator. Stop the machine and
clean the cooling fins
with compressed air
or steam. Use
reduced pressure for
cleaning the fins.
Reduced cooling air
from fan. Check the fan and the
drive belts. Check for
any obstruction inside
the cowl.
Faulty thermostat Check the thermostat
and replace if
necessary.
Engine
speed too
high. Incorrect throttle arm
setting. Check the engine
speed setting.
Engine
speed too Incorrect throttle arm
setting. Check the throttle
setting.
low.
Blocked fuel filter. Check and replace if
necessary.
Blocked air filter. Check and replace
the element if
necessary.
Incorrectly set
regulation system. Reset the regulation
system. Refer to
SPEED AND
PRESSURE
REGULATION
ADJUSTMENT in the
MAINTENANCE
section of this
manual.
Premature
unloading. Check the regulation
system.
Excessive
vibration. Engine speed too
low. See ”Engine speed
too low”
Leaking oil
seal. Improperly fitted oil
seal. Replace the oil seal.
Refer also to the Engine Manufacturer’s Manual.
Air
discharge Engine speed too
low. See “Engine speed
too low”
capacity too
low.
Blocked air cleaner. Check the restriction
indicators and replace
the element(s) if
necessary.
High pressure air
escaping. Check for leaks.
Incorrectly set
regulation system. Reset the regulation
system. Refer to
SPEED AND
PRESSURE
REGULATION
ADJUSTMENT in the
MAINTENANCE
section of this
manual.