Lombardini CHD series - Injection Pump Maintenance; How to reassemble injection pump components; Injection pump non-return valve; Injection pump control rod

- 68 - Workshop Manual LDW CHD _ cod. 1.5302.345 - 6° ed_rev. 05
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How to reassemble injection pump components
Fit the plunger with helix E directed towards the discharge union
B;ifitiserroneouslyttedwithspiralfacingthefuelfeedunion
A the injection pump will not operate (thus the possibility of the
engine overspeeding is completely ruled out); complete reas-
semblyfollowingg.154
 Tighten delivery union to 35 Nm; it is essential to use a torque
wrench.
Tool serial number
7107.1460.212
How to remove injection pump feeding tubes
Caution – Warning
Cutting the pipe in the opposite direction to the arrow A
(horizontally) damages the pump coupling with consequent
leakage of fuel.
Cut the nylon tube at A.
Remove the portion left inside the union using pliers.
Remove the nylon tube without damaging the union seals as
showninthegure159.
Injection pump control rod
Caution – Warning
Do not unscrew ring nut 2 before removing rod 1.
Control rod 1, operated by the throttle and governed by the speed
governor, controls the injection pump.
Ring nut 2 keeps rod 1 in the required position by means of
groove 3.
Injection pump non-return valve
The discharge union is tted with a non-return valve A; this
valve improves injection by bleeding the air inside the fuel and
stops the engine immediately after the stop device is operated.
Toreplacetheoutletunionwithnon-returnballvalveonQLCtype
injectionpumps(havinginletandoutletunionspressure-ttedon
the pump case) use the special tool serial number 7107.1460.212.
Tool B is required for removal of valve A, tool C for driving.
Fuel system