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Service and repair
8-60
10070389 Rev. A
Puritan Bennett™ 700 Series Ventilator System Service Manual
8.12.4 Meshing motor pinion gear with rack
Caution
• Always perform the gear mesh procedure to reinstall the motor/encoder to the
piston/cylinder assembly. The failure to perform this procedure properly may result in
damage to the piston/cylinder assembly.
• Be extremely careful to prevent debris of any kind from entering the cylinder while
the check valve is off. Debris can permanently damage the piston/cylinder assembly.
NOTE:
• The gear mesh procedure must be performed with the piston/cylinder outside of the
ventilator.
• The illustrations accompanying this procedure show the rack cover removed for
clarity.
Whenever you install the motor/encoder to the piston/cylinder, you must mesh the motor’s
pinion gear with the rack. To mesh the gear, do the following:
1.
Make sure piston/cylinder is removed from ventilator (Section 8.12.2, steps 1 through 8)
and motor/encoder is removed from piston/cylinder.
2.
Push rack to its end stop at delivered end (far away from motor) of cylinder (Figure 8-47).
Figure 8-47. Gear mesh procedure: Pushing rack to end stop at delivered end
3.
Position motor/encoder on motor angle bracket with pinion facing down (Figure 8-48)
and power input cable to motor facing front of cylinder (Figure 8-50).
4.
Using 4-mm hex driver, install four M5 x 20 screws, split-ring washers, and flat washers
(spring washers located between screw heads and flat washers), but do not tighten
them. The screw head should be just above the washers and the split-ring washers
should not be in the locked positions (Figure 8-49).
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