Toro Groundsmaster 300 Series Service Manual page 270

42. Apply clean multi-purpose grease to the four o-rings
and seal ring. Put the new o-rings and seal ring into their
proper location in the port cover (Fig. 106).
43. Align a groove on the side of the port cover with the
grooves on the side of the port manifold and put the port
cover into position (Fig. 107).
Repairs Page 8 - 50
Figure 106
Figure 107
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Groundsmaster 300 Series