Doosan DX60R Shop Manual page 378

Adjusting Fuel Injector Pressure
The fuel injectors
predetermined pressure threshold. They close when the
pressure is reduced below that threshold. The pressure
threshold can be adjusted by adding or removing shims (3,
Figure 294).
Reference
Number
1
2
3
4
5
6
7
8
9
10
The injection pressure will change by approximately 275 psi
2
(1.9 MPa; 19 kgf/cm
thickness.
See the parts catalog for available shims.
Each pressure adjusting shim removed or added changes
the pressure threshold by approximately 275 psi (1.9 MPa,
2
19 kgf/cm ). Adding adjusting shims increases the
threshold pressure. Removing adjusting shims reduces
the pressure threshold.
1. Disassemble the fuel injector assembly. See "Disassembly
and Inspection of Fuel Injectors" on page -197
2. Remove or add adjusting shims as needed.
3. Reassemble the fuel injector assembly. "Reassembly of
Fuel Injectors" on page 1-199.
4. Retest the fuel injector. See "Testing of Fuel Injectors" on
page -194 If the injector cannot be adjusted to the
appropriate pressure, discard the fuel injector.
Engine
Page 198
open when pressure
Description
Fuel Return Passage
Injector ID Location
Injector Body
Pressure Adjusting Shims
Spring
Spring Seat
Valve Stop Spacer
Nozzle Valve
Nozzle Body
Nozzle Case Nut
) for every 0.1 mm (0.004 in.) in shim
CAUTION
reaches a
Figure 294
SP001693