5 Maintenance
5.4.4 Checking rotor abutment alignment
Step 1
Incorrect setting of rotor alignment will damage the pump.
Fit rotors onto shafts (24 and 25) and tighten rotor retention nuts (22).
Step 2
1. Using a depth micrometer ensure axial alignment is within
tolerance of 0.012mm (0.0005 in).
2. If the alignment is incorrect, the shaft abutment spacer (27)
must be replaced/machined.
5.4.5 Fitting timing gears
Step 1
Slide timing gears (36) onto shafts (24 and 25), realigning timing marks.
Step 2
1. Before fitting the torque locking devices (38) lubricate them with
gear oil. Series 1, 2 and 3 high pressure pumps (i.e. LD and
HD models) have two sets of elements.
2. Series 4, 5 and 6 pumps have torque locking assemblies.
Step 3
Fit timing gear clamp plates (39) - series 1, 2 and 3 only.
Fit torque locking assemblies (37) - series 4, 5 and 6 only.
Step 4
Timing adjustment is now required:
Tighten one clamp plate/torque locking assembly only, allowing
rotation of the shaft in the other gear for timing adjustment. See
Adjusting Rotor Timing section 5.4.6.
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