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1 Phase Motor Replacement
How to replace a 1 phase motor on Bulldog 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 four cover screws and remove cover.
ii. Disconnect motor wires from M1, L1, and GND in S1
Electrols.
iii. Loosen cord grip fitting on motor junction box.
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 bolt and belt alignment bolt (if present).
7. Remove motor mounting bolts and defective motor.
Note pulley orientation for proper installation.
8. Loosen motor pulley set screws and remove motor pulley.
9. Replace shaft key. Properly orientate motor pulley on motor shaft.
Do not tighten set screws.
10. Position motor on base.
11. Place belt over pump and motor pulleys.
12. Install motor mounting bolts previously removed.
13. Tension and align belt. See “Belt Replacement, Alignment and
Tensioning Service Instructions”.
14. Connect motor wires with proper orientation as noted.
a. Gray Box Electrols:
i. Reverse step 3a.
b. S1 Electrols:
i. Reverse step 3b.
15. Replace vacuum unit in original spot. Reattach exhaust
outlet and Filtrols intake hose couplings.
BULLDOG
1 Phase Gray Box Electrols
Note: Gray Box Electrols have several variations
Motor Wires 2T1, 4T2,
and Motor Ground
Motor Ground Lug
S1 Electrols
Motor Wires
GND, M1, L1
Loosen Cord Grip Fitting
Cord Grip
Bulldog Motor Bolts
Belt Tension Bolt
Motor Mounting
Bolts (4)
Belt Alignment Bolt
