Troubleshooting; Troubleshooting Of Fuel Injection Pump; Major Faults And Troubleshooting - Takeuchi TB 175 Handbuch

6. Troubleshooting

6.1. Troubleshooting of fuel injection pump

Complete repair means not only replacing defective parts, but finding and eliminating the cause of the trouble as
well. The cause of the trouble may not necessarily be in the pump itself, but may be in the engine or the fuel
system. If the pump is removed prematurely, the true cause of the trouble may never be known. Before removing
the pump from the engine, at least go through the basic check points given here.
Basic checkpoints
Check for breaks or oil leaks throughout the fuel system, from the fuel tank to the nozzle.
Check the injection timings for all cylinders. Are they correctly adjusted? Are they too fast or too slow?
Check the nozzle spray.
Check the fuel delivery. Is it in good condition? Loosen the fuel pipe connection at the injection pump
inlet and test operate the fuel feed pump.

6.2. Major faults and troubleshooting

Fault
1. Engine Fuel not delivered
won't start. to injection pump.
Fuel delivered to
injection pump.
Cause
(1) No fuel in the fuel tank.
(2) Fuel tank cock is closed.
(3) Fuel pipe system is clogged.
(4) Fuel filter element is clogged.
(5) Air is sucked into the fuel due to defective
connections in the piping from the fuel tank to the
fuel pump.
(6) Fuel feed pump is damaged.
(7) Fuel freeze.
(1) Defective connection of control lever and accel. rod
of injection pump.
(2) Plunger is worn out or stuck.
(3) Delivery valve is stuck.
(4) Control rack doesn't move.
(5) Injection pump coupling is damaged, or the key is
broken.
(6) Air sucking.
(7) Plunger/Distribution shaft is seized.
(8) Tappet is seized.
(9) Stop solenoid is damaged.
(10) Cold start device is damaged.
(11) Low cranking speed.
(12) Governor is damaged.
(13) Barrel crack
(14) Transmission shaft is seized. Gear slip.
55
Remedy
Resupply
Open
Clean
Disassemble and clean, or
replace element
Repair
Replace
Replace with a fuel for cold
weather.
Repair or adjust
Repair or replace
Repair or replace
Repair or replace
Replace
Bleed air.
Replace pump.
Replace pump.
Replace
Replace
Replace battery.
Replace
Replace pump.
Replace