Service Manual

18. Remove the two alignment pins that align the port

manifold, valve ring and isolation manifold (Fig. 38).

19. Remove the isolation manifold (four plates bonded

toge

ther) (Fig. 39).

20. Inspect the ground surfaces of the isolation mani-

fold. You should notice a “normal” polished pattern due

to the rotation of the valve plate, and on the opposite

side a “normal” polished pattern due to the action of the

commutator cover and commutator seal. The holes and

edges should be free of nicks. The manifold surfaces

should be free of nicks or scoring. If the manifold has

developed any of these conditions, it must be replaced.

21. Remove the two isolation manifold-metering ring

ignment pins (Fig. 40).

Figure 38

Figure 39

Figure 40

Groundsmaster

300 Series Page 8 - 27 Repairs