A commercial backpack vacuum with a dead motor is not a machine you throw away. This is the genuine Ametek Lamb 122341-07, a 120 volt, single-stage, 5.7 inch thru-flow motor with peripheral discharge, and it is the motor repair techs and fleet managers reach for when a 5.7 inch unit stops pulling. It is listed as replacing 105162, 101719 and 119347-00, and as the equivalent of the Domel 4963447.
Built for
- Commercial backpack and canister vacuum repair, where a motor swap returns a machine that costs many times more to replace.
- Self-serve car wash and utility vacuums built around a 5.7 inch 120V thru-flow motor.
- Fleet maintenance programs standardizing on one service motor across several older part numbers.
- Dry pickup machines only. Thru-flow motors pass the working air over the windings, so water, foam or chemical through the motor will end it.
What techs should know before installing
Two install details account for most early failures on a brand new motor. The first is torque. Over-tightening the mounting screws pushes the fan casing into the fan blades and damages the fans, and Ametek's motor warranty program excludes that damage. A touch beyond finger tight is all this motor needs to seat.
The second is filtration. Because a thru-flow motor is cooled by the dirty air it is vacuuming, a missing or degraded motor gasket lets debris reach the windings directly. Fit a fresh motor gasket, and a filtered gasket or motor filter where the machine supports one, at the same time you fit the motor.
On service life, the trade consensus for motors in this class is to change carbon brushes around 500 to 600 operating hours and to replace the motor rather than the brushes once it has reached the end of its life. A burning smell or blue sparking at the commutator is the signal to look. If new brushes are fitted, seat them at reduced voltage before running at full power so the commutator does not pit.
Specifications
- Motor type: thru-flow
- Discharge: peripheral
- Bearings: ball bearing / sleeve
- Voltage: 120 volts, single stage, 5.7 inch motor size
- Sealed vacuum: 98.1 inches
- Maximum air watts: 440
- Maximum air flow: 147.3 CFM
- Maximum amps: 11.6
- Motor speed: 35,510 RPM
- Connection: 2 wire
- Carbon brush: 833326-51
- Cross-reference: replaces 105162, 101719, 119347-00; equivalent to Domel 4963447
Installation note
Over-tightening of the mounting screws may cause the fan casing to push into the fan blades and may damage the fans. This situation is not covered under the Motor Warranty Program and will not be approved if submitted. If a motor is turned in under warranty and is found to have this type of damage, the warranty will be denied. When mounting your new motor, in most cases a touch beyond finger tight is all that is required to mount and seat the motor sufficiently.
Frequently asked questions
What machines does this motor fit?
It is a 5.7 inch, 120V, single-stage thru-flow motor sold as a service motor for commercial backpack and canister vacuums and for 120V car wash and utility vacuums. Sellers list it as replacing 105162, 101719 and 119347-00 and as equivalent to Domel 4963447. Confirm against the number on your existing motor before ordering.
Can I just replace the brushes instead?
Sometimes. If the brushes wore far enough to score the commutator, new brushes will wear quickly and gain you very little, and replacing the motor is the better spend.
Why did my last motor fail early?
The two usual causes in a thru-flow design are debris reaching the motor through a missing or degraded motor gasket or filter, and water, foam or chemical being pulled through. This is a dry pickup motor.
Is there anything special about installing it?
Yes. Do not over-tighten the mounting screws. Over-tightening pushes the fan casing into the fan blades and damages the fans, and that damage is excluded from the motor warranty program. A touch beyond finger tight is all that is needed. Fit a motor gasket at the same time.
What is the difference between thru-flow and bypass?
A thru-flow motor is cooled by the air it is vacuuming. A bypass motor has a separate cooling fan drawing clean air. Thru-flow is more compact and less costly; bypass runs cooler. This is a thru-flow motor.
Discount Cleaning Products is an authorized dealer for genuine Ametek Lamb vacuum motors. We stock motors, carbon brushes and gaskets for commercial machines, and our US-based team can help you cross-reference the number on your existing motor before you order.
