Doosan DX60R Shop Manual page 366

If reinstalling the original fuel injection pump:
• Align the reference marks (1, Figure 266) previously
made on both the fuel injection pump mounting
flange and gear case or front plate.
• Tighten the fuel injection pump retaining nuts to
specification. See "Special Torque Chart" on
page -174
If installing a new fuel injection pump:
• Reinstall the timing grid sticker, provided with the
new fuel injection pump, onto the back of the gear
case / front plate (Figure 267). Align the "standard
mark" (1, Figure 267) with the reference mark (2,
Figure 267) made on the gear case during
disassembly.
• Calculate the difference between the timing index
numbers (1, Figure 267) of the fuel injection pump
that you removed and the replacement fuel injection
pump. See Calculation Example below.
Engine
Page 186
Figure 266
Figure 267
Figure 268
SP001693