Doosan DX22 - Hand Priming Pump and Connecting Adapter; Three-Way Valve

8. Fuel System
104
Three-Way Valve
Materials and Specifications
EDX22190176
Zinc (Zn), copper (Cu), lead (Pb), sodium (Na) and calcium
(Ca) cause chemical reactions with water in fuel and
biodiesel, thereby forming various corrosive acids, sludge
and viscous substances.
When this occurs, it causes premature clogging of the
primary fuel filter, seizure of injectors, corrosion and wear of
fuel system components, including the injection system,
leading to excessive maintenance expenses resulting from
engine failure. Hence, in addition to using stainless
materials, please refer to the figure on the right to purchase
and install threaded products among the commercially
available L-type three-way valves to enable piping to be
connected easily.
Hand Priming Pump and Connecting Adapter
Components
EDX22190177
A hand priming pump and two piping connecting adapters
are provided as separate accessories along with the engine.
Installation
EDX22190178
1. Remove the plug for preventing foreign matter from
entering the hand priming pump and tighten the
connecting adapters provided to the specified torque.
As illustrated by the installation location in the fuel system
schematic diagram, the hand priming pump must be
located between the three-way valve and primary fuel
filter, and four M6 bolts should be installed firmly in loca-
tions which do not disrupt the generator set controls in
order to prevent looseness and unnecessary movement
during operation.
When tightening piping couplings, tighten the coupling
with the connecting adapter on the hand priming pump
secured with a 27 mm spanner to prevent the adapter
from turning along with the coupling.
Make sure that the tightening torque of piping being
connected does not exceed a maximum of 9.5 kgf·m
(68.71 lbf·ft).
Operation
The hand priming pump is used for priming to remove air
remaining in the fuel passages after service work which
requires the removal and installation of engine fuel system
components and the primary/secondary fuel filters.
1. Turn the handle on the hand priming pump counterclock-
wise by hand to unlock the pump.
EDX22190179
1/2-14 NPTF
SAE J 516 1 1/16-12 UNF-2B
1/2-14 NPTF
SAE J 516 1 1/16-12 UNF
Plug to prevent foreign
matter from entering
Torque 5 ±0.5 kgf·m (36.1651 ±3.6165 lbf·ft)
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