1. Place the pump head on a clean work surface with the
bolting ange down.
2. Press the inner grease seal in through the main
bearing cavity until ush with the bottom of the bore.
Seal lips must be oriented down as shown in each
parts detail drawing. (See Figure 6.1)
3. Press the main bearing into the head and install the
retainer ring.
4. Install the relief tting into 1/8 in. NPT threaded hole
and turn the head over.
5. After lubricating the mechanical seal seat with light oil,
press the seal seat into the head using your ngers.
Make sure the seal seat is fully seated and the shiny
side faces up. Apply a generous amount of light oil
to the seal seat to remove any remaining debris and
ngerprints. Install the case O-ring around the pilot OD
of the head.
6. Press the outer grease seals into each of the
bearing caps.
7. Press the spring pins into each of the cam key holes.
8. Install the cam key into the pump case. Slide the cam
into the pump case aligning the long inlet slots to the
inlet portion of the case.
9. Install one sideplate and bolt one head into place with
two bolts.
10. Turn the pump onto the assembled head. Ensure there
is enough room to allow the shaft to extend through
the assembled head by six inches.
11. While holding the rotor-shaft vertical, install the vane
drivers. Vertically install the rotor-shaft into the unit.
Slide the vanes into each rotor slot ensuring the
rounded tip contacts the cam and the vane slots face
into the direction of rotation as shown in each parts
detail drawing.
12. Install the remaining sideplate.
13. Lubricate the pump shaft and seal carbon with light
oil. Install the seal retainer assembly by aligning the
retainer slot onto the seal alignment pin. Carefully
press the seal carbon into the retainer assembly with
the polished face oriented outward by aligning the
carbon notches to the retainer pins. Again, apply a
generous amount of light oil to remove any remaining
debris and ngerprints.
14. Carefully install the head over the pump shaft and seal
assembly and torque the bolts in accordance with the
appropriate bolt torque pattern drawing. This pattern
ensures even bolting of the head into the case without
deforming the cam inlet port. This is done by bolting
those bolts over the solid portion of the cam port.
15. Turn the pump over and remove the rst head.
16. Install the seal retainer assembly and carbon as
outlined in step 13 above.
17. Bolt head to case as described in step 14 above.
Ensure the rotor shaft turns freely in either direction.
18. Slide the bearing race mounting ring onto one end
of the shaft until contact with the main bearing
inner race. Mount the thrust bearing assembly
onto the bearing race mounting ring and install the
bearing cap.
19. Lightly tighten the bearing cap with two opposed bolts
until the rotor shaft cannot be freely turned. Measure
the gap between the head and bearing cap at four
points around the bearing cap. Adjustment may be
necessary to contain the gap within .001 inch. Round
up the average measurement to the nearest even
number. This is the measured amount of bearing cap
shims. Refer to parts pages for shim measurements.
20. Remove the two bearing cap bolts and install the
measured amount of shims plus .006 inch. Install the four
bearing cap bolts and torque in a crossing pattern.
21. Install the remaining bearing race mounting ring and
thrust bearing assembly on the opposite side of the
pump.
22. Perform step 19 again on the opposite side and install
the measured shims plus .002 inch. Install the four
bearing cap bolts and torque in a crossing pattern.
23. Install the shaft key and ensure shaft rotates smoothly.
6.3 Assembly Instructions For All Z-Series Repair and Rebuild Kits
18
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