RAMVAC BISON, Service Instruction

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Page 11
BISON
1 Phase Motor Replacement
How to replace a 1 phase motor on Bison models
1. Secure disconnect.
2. Move vacuum unit into an open area if needed.
Note location and orientation of motor wires for proper installation.
3. Disconnect motor wires.
a. Gray Box Electrols:
i. Disconnect motor wires from 2T1, 4T2, and motor ground in
Electrols and remove wire from cord grip.
b. S1 Electrols:
i. Remove cover screws and cover from S1 Electrols.
ii. Disconnect motor wires from M1, L1, and GND in S1 Electrols.
iii. Loosen cord grip on motor junction box and remove conduit.
iv. Carefully remove wires from conduit leaving the conduit
attached to the S1 Electrols.
4. Remove belt guard.
5. Loosen all four motor mounting bolts ½ turn from full tight.
6. Loosen belt tension bolts and remove belts.
Note pulley and hub orientation for proper installation.
7. Loosen pulley hub screws and remove motor pulley.
a. See “Taper Lock Pulley Remove and Replace” procedure in the
“Belt Replacement, Alignment, and Tensioning Service Instruction”
8. Remove motor mounting bolts and defective motor.
9. Install motor on base with motor mounting bolts previously removed.
10. Replace shaft key and properly orientate pulley and pulley hub on
motor shaft. Do not tighten hub screws.
11. Place belts over pump and motor pulleys.
12. Tension and align belt. See “Belt Replacement,
Alignment and
Tensioning Service Instructions”.
13. Connect motor wires with proper orientation as noted.
a. Gray Box Electrols:
i. Reverse step 3a.
b. S1 Electrols:
i. Reverse step 3b.
14. Replace vacuum unit in original spot. Reattach exhaust outlet
and Filtrols intake hose couplings.
1 Phase Gray Box Electrols
Note: Gray Box Electrols have several variations
Motor Wires 2T1, 4T2
Motor Ground
Motor Ground Lug
Bison Motor Bolts
Motor Mounting
Bolts (4)
Motor Tension
Bolts
Motor Wires
L1, M1, GND
S1 Electrols
Cord Grip
Cord Grip
Remove Cover
Screws (4)