reference. Remove four screws (2) and lift the cover (3) off the pump.
c.
Remove the cover o-ring (7). Pry or pull out the cartridge from the pump body (23). Remove the snap ring (17)
and pull the shaft (20) and bearing (19) from the pump body. Drive the shaft seal (22) out of the body. If you
need to remove the bearing (19), first remove the small snap ring (18) and then press the shaft (20) out of the
bearing (19) while supporting the bearing inner race.
d.
Disassemble the cartridge. Remove the o-ring (5), back-up ring (6), and square sealing ring (7) from the outlet
support plate (13). Scribe a line across the outer surface of the cartridge kit. (The mark will help during
assembly.) Place the cartridge on a flat surface with outlet support plate (13) down and remove the two socket
head screws (8).
CAUTION
Do not slide flex side plates across the ring and rotor. Burrs on the ring or rotor can cause
deep scratches in the soft brass surface.
e.
Slide the inlet support plate (13) and seal packs (10) off the cartridge. Move the flex side plate (12) off center
just enough to grab the edge and lift up and away without sliding. Place a small flat piece of wood over the ring
(14) and rotor (16) and reverse the cartridge to have the outlet support plate (13) pointing up. Slide the outlet
support plate (13) and seal packs (10) off the cartridge while preventing the flex side plate (12) from sliding with
the support plate (13).
f.
Move the flex side plate (12) off center just enough to lift up and away without sliding. Remove the cam ring (14)
from the rotor and vanes. Locate the arrow stamped into the rotor periphery. Remove the vanes and inserts in
order, starting at the arrow. Keep them in order during inspection. Do not remove the cartridge locating pins (11)
unless they are damaged. The pins are a drive-lock type and may be difficult to remove.
4-19.4.2 Cleaning, Inspection, and Repair.
a.
Clean all parts thoroughly and keep them clean during inspection and assembly. The close tolerance of the parts
makes this requirement very important. Use an approved solvent for cleaning and filtered, compressed air for
cleaning and drying.
b.
Discard shaft seals, o-rings, back-up rings, and seal packs. Use a new seal kit for reassembly.
c.
Check the cartridge wear surfaces for scratches, scoring, pitting and excessive wear. Slight heat discoloration of
the flex side plate bronze surface is normal. Scoring deeper than .001 inch and scratches deeper than .002 inch
indicate a new part is needed. Slight scoring and/or scratches can be removed with a crocus cloth or an oiled
arkansas stone. DO NOT use a dry stone on the bronze surface or scratches will result.
d.
Inspect both sides of each vane and insert in order. If heavy wear or scoring is found, check the appropriate
rotor slot. Replace scored parts. Inspect the cam ring for vane chatter marks, wear and/or scratches. Replace if
scoring is evident. Use the stone to remove any burrs.
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