305943 Broce Main Broom Core Motor - 24.0 Cu In - 14-Tooth Spline - Broce 350 Sweeper - 2-Bolt SAE A

305943 Main Broom Core Motor for Broce 350 Series Sweepers

Your Broce 350's main broom has lost power — the broom core is spinning slowly, stalling under load, or won't turn at all. The hydraulic motor that drives the 8-foot broom core has failed internally. Worn gerotor elements, blown shaft seals, or internal bypass means the motor can't generate the torque needed to sweep. The Broce dealer is quoting $855 to $1,237 for a replacement motor. That's a brutal hit on a wear component.

We sell the direct replacement for $808.80 — saving you hundreds vs the dealer. This is the same specification motor: 24.0 cubic inch displacement for maximum sweeping torque, 1-1/4" 14-tooth splined shaft that fits the standard Broce core hub, and 2-bolt SAE A mounting pattern. It bolts directly into the broom core housing and connects to the existing hydraulic lines. Replaces Broce part number 305943.

⚠️ Critical: Splined Shaft — NOT Keyed Shaft

The Broce 350 main broom core uses a 14-tooth splined shaft motor. This is NOT a keyed shaft. Broce uses keyed shaft motors on the smaller gutter brooms, but the main 8-foot broom core requires the splined shaft to handle the significantly higher torque loads. A keyed shaft motor will NOT fit the broom core hub.

• Splined Shaft (This Motor): 1-1/4" 14-tooth spline — for the main broom core. Handles the torque of driving the full 8-foot broom.
• Keyed Shaft (WRONG Motor): Used on gutter brooms and smaller accessories. Will not engage the broom core hub splines.

How to verify: Look at the shaft end of your existing motor. If it has teeth/splines around the circumference (like a gear), this is the correct splined shaft style. If the shaft is round with a single flat key slot, you need a keyed shaft motor (and this is NOT it).

The Problem

The main broom core motor is the heart of any Broce sweeper. It's a high-displacement hydraulic motor that converts hydraulic flow into the rotational force that drives the broom core at the correct speed and torque. The broom core sits in the worst possible environment — dust, dirt, debris, water, and abrasive materials are constantly being thrown against the motor. Over time:

• Internal gerotor elements wear — loss of displacement = loss of torque and speed
• Shaft seal failure — hydraulic oil leaks externally, contamination enters the motor
• Internal bypass — oil flows through the motor without generating rotation
• Bearing failure — shaft wobble, noise, and eventually seizure
• Case drain overpressure — internal leakage exceeds case drain capacity

When the broom motor fails, the sweeper can't sweep. It becomes a very expensive truck that can't do its job. Every day the broom is down is lost contract revenue — municipalities, airports, and construction companies don't wait for parts.

The Solution

This is a high-torque, low-speed hydraulic motor built to the same specification as the OEM unit: 24.0 cubic inch displacement (395 cc) provides the massive torque needed to drive an 8-foot broom core through heavy debris, wet material, and compacted dirt. The 14-tooth splined shaft engages directly with the broom core hub, and the 2-bolt SAE A flange bolts directly to the core housing. Remove the old motor, bolt on the new one, connect the hydraulic lines, and the broom is sweeping again.

Specifications

• Broce OEM Part Number: 305943
• Type: Hydraulic Motor — High Torque / Low Speed (Gerotor)
• Displacement: 24.0 cu in (395 cc)
• Shaft: 1-1/4" — 14-Tooth Spline
• Mounting: 2-Bolt SAE A Flange
• Application: Main Broom Core Drive
• Dust Seal: Included — nose-mounted seal guard for debris protection
• Condition: Brand New

Compatible Equipment

The 305943 main broom core motor fits:

• Broce 350 Series Sweepers
• Broce Broom models using the 305943 broom core motor with splined shaft

⚠️ Verify Broce part number 305943 in your parts manual. Confirm your broom core hub accepts a 14-tooth splined shaft (not keyed). Contact us with your sweeper model and serial number if you're unsure.

Installation Notes

• Relieve hydraulic pressure before disconnecting any lines — shut down the engine, cycle the broom controls several times with the engine off, and allow the system to depressurize
• Raise and secure the broom core housing for access to the motor
• Clean the area around the motor and hydraulic connections thoroughly
• Label the hydraulic lines (pressure, return, and case drain) before disconnecting
• Cap all open lines and ports immediately to prevent contamination
• Remove the 2-bolt SAE A flange mounting bolts
• Slide the old motor out of the broom core hub — the splined shaft will disengage from the hub splines
• Inspect the broom core hub splines for wear or damage — replace the hub if splines are severely worn
• Apply a thin film of clean hydraulic oil to the splined shaft of the new motor
• Align the splines and slide the new motor into the hub — do not force it
• Install and torque the 2-bolt flange mounting bolts to spec
• Connect the hydraulic lines — pressure to pressure port, return to return port, case drain to case drain
• Check that the dust seal on the motor nose is properly seated against the core housing
• Check hydraulic fluid level and top off
• Start the engine and slowly engage the broom — check for leaks and proper rotation direction
• Run the broom at low speed for several minutes to circulate oil through the new motor before full-speed operation

Symptoms of a Failing Broom Core Motor

• Broom rotates slowly or has noticeably less sweeping power
• Broom stalls under load — stops when hitting heavy debris or wet material
• Broom won't rotate at all — motor has seized or completely bypassed internally
• Hydraulic oil leaking from around the motor shaft or mounting flange
• Motor runs hot — excessive internal leakage generating heat
• Unusual noise from the broom area — grinding, whining, or knocking from internal bearing or gerotor failure
• Hydraulic oil contaminated with metal particles — visible in filter or tank
• Case drain flow excessive — indicates severe internal wear

Frequently Asked Questions

What is the difference between the main broom motor and the gutter broom motor?
The main broom core motor (this part) is a large 24.0 cu in displacement motor with a 14-tooth splined shaft — it drives the full 8-foot main broom. The gutter broom motor is a smaller displacement motor with a keyed shaft — it drives the small side-mounted gutter broom. They are NOT interchangeable. Different size, different shaft, different mounting.

Why does the shaft type matter so much?
The broom core hub has internal splines that mesh with the motor's splined shaft. This spline connection is what transfers torque from the motor to the broom. A keyed shaft motor cannot engage these splines — it physically will not fit into the hub. Always verify your shaft type before ordering.

Should I flush the hydraulic system when replacing the motor?
If the old motor failed catastrophically (metal particles in the oil, seized internals), yes — you should flush the system and replace the hydraulic filter before installing the new motor. Contaminated oil will damage the new motor immediately. If the old motor simply wore out gradually (loss of power, slow rotation), a filter change and oil top-off may be sufficient.

How many hours does a broom core motor typically last?
A well-maintained broom motor typically lasts 2,000–4,000+ hours depending on operating conditions. Sweeping abrasive materials (gravel, sand, construction debris) wears motors faster than sweeping light debris (leaves, paper). Keeping the hydraulic oil clean and the filter changed on schedule is the single most important factor in motor longevity.

What hydraulic oil should I use?
Use the hydraulic oil grade specified in your Broce operator's manual — typically AW-46 (ISO VG 46) hydraulic oil. Do not mix oil types or grades. If the system has been contaminated, flush completely before refilling with fresh oil.