Rear Axle Ring & Pinion Gear Set with Master Install Kit for Broce Broom 350 - Koyo Bearings - Replaces 7066139X / 076613-9X

Rear Axle Ring & Pinion for Broce Broom 350 — Replaces 7066139X

Complete ring and pinion gear set with a master install kit for the rear axle of Broce Broom 350 sweepers. This is everything you need to rebuild the rear differential — gears, bearings, seals, shims, bolts, and hardware — in one box. Correct gear ratio for Broce hydraulic drive systems. Premium Koyo brand bearings throughout. Replaces Broce 7066139X and 076613-9X. In stock at $895 — less than half the Broce dealer price.

The Problem

Your Broce Broom is howling, grinding, or clunking from the rear axle. The gear whine gets louder under load. You might be leaking gear oil from the pinion seal. Or the rear axle has completely locked up and the broom won't drive at all. A failed ring and pinion means the broom is off the road — and if you're a municipality under contract, an airport with an FOD sweep schedule, or a contractor with a deadline, that broom needs to be running.

You call the Broce dealer. The ring and pinion set is $1,475+ just for the gears. Then you need bearings, seals, shims, and hardware — all sold separately at dealer markup. By the time you add everything up, you're looking at $1,800–$2,000+ in parts alone, before labor. And the dealer lead time might be weeks.

The Solution

We sell the complete gear set AND the master install kit as one package for $895 — less than half the dealer price for the gears alone. This is the correct ratio ring and pinion for the Broce 350 hydraulic drive system, bundled with every bearing, seal, shim, and bolt you need for a professional-grade rebuild. Nothing else to buy.

What's Included — Master Install Kit

This is a complete kit. Everything you need is in the box:

Gears

• Ring Gear — correct ratio for Broce 350 hydraulic drive
• Pinion Gear — matched set, lapped together

Bearings (Koyo Brand — Premium Quality)

• Carrier Bearings (2) — Koyo brand, Japanese-made
• Carrier Bearing Races (2) — matched to bearings
• Pinion Bearings (2) — Koyo brand, front and rear
• Pinion Bearing Races (2) — matched to bearings

Seals & Gaskets

• Pinion Seal — new seal prevents gear oil leaks
• Differential Cover Gasket or RTV Silicone — for sealing the cover

Shims & Hardware

• Complete Shim Kit — for setting pinion depth and carrier bearing preload
• Ring Gear Bolts — new bolts (never reuse ring gear bolts)
• Pinion Nut — new nut for proper preload
• Crush Collar — if applicable to your axle configuration

Setup Supplies

• Threadlocker — for ring gear bolt installation
• Marking Compound — for checking gear tooth contact pattern
• Applicator Brush — for applying marking compound

Why Koyo Bearings?

This kit uses Koyo bearings — not generic imports. Koyo (JTEKT Corporation) is a Tier 1 Japanese bearing manufacturer and a direct OEM supplier to Toyota, Honda, Ford, and major drivetrain manufacturers worldwide. Koyo bearings are used as original equipment in millions of vehicles and industrial applications. They are heat-treated, precision-ground, and rated for the loads and temperatures of differential service. Cheap bearings in a ring and pinion rebuild are a recipe for premature failure and doing the job twice.

Specifications

• Broce OEM Part Numbers: 7066139X, 706613-9X
• Type: Ring & Pinion Gear Set with Master Install Kit
• Application: Rear Axle Differential
• Gear Ratio: Correct ratio for Broce 350 hydraulic drive system
• Bearings: Koyo (JTEKT) — Japanese OEM-grade
• Kit Type: Master Install — includes all bearings, seals, shims, and hardware
• Condition: Brand New — gears and all components

Compatible Equipment

This ring and pinion set with master install kit fits the following Broce Broom models:

• Broce Broom RJT350
• Broce Broom RCT350
• All other Broce Broom 350 models

⚠️ Verify your Broce part number (7066139X or 076613-9X) in your service manual before ordering. If your broom is a 250 model or a non-standard configuration, contact us with your model and serial number to confirm fitment.

Symptoms of a Failing Ring & Pinion

• Gear whine: A high-pitched whine from the rear axle that gets louder under load or at speed — this is gear tooth wear
• Grinding or crunching: Metal-on-metal noise from the differential — severe gear damage
• Clunking on acceleration/deceleration: Excessive backlash between ring and pinion teeth
• Rear axle locked up: Complete gear failure — the broom won't drive
• Gear oil leak at pinion seal: Worn pinion seal or bearing allows oil to escape — if the axle runs dry, the gears will destroy themselves
• Metal shavings in gear oil: Pull the differential cover or drain the gear oil — if you see metal flakes or particles, the gears are failing
• Vibration at speed: Worn pinion bearings or damaged gear teeth cause vibration through the drivetrain
• Overheating rear axle: Excessive friction from worn bearings or damaged gears generates heat — the axle housing will be noticeably hot

Why Buy From Trenchwell?

• Save $580+: The Broce dealer charges $1,475+ for the gear set alone — and sells the bearings, seals, and shims separately at additional cost. Our $895 kit includes everything: gears, Koyo bearings, seals, shims, bolts, hardware, and setup supplies. One box, one price, nothing else to buy.
• Master Install Kit = Do the Job Once: Cheap rebuild kits skip the shim kit, the crush collar, or use generic bearings. Then you're tearing the axle apart again in 6 months. This master kit includes every component for a professional, by-the-book rebuild — from the Koyo bearings down to the marking compound for checking your gear pattern.
• Koyo Bearings — Not Junk: The bearings are the most critical part of a ring and pinion install. Cheap bearings fail under load and take the new gears with them. Koyo is a Tier 1 Japanese OEM supplier. These are the same quality bearings used by major automotive and industrial manufacturers worldwide.
• Correct Ratio: This is the correct gear ratio for the Broce 350 hydraulic drive system. Not a "close enough" ratio from an automotive catalog — this is the specific set designed for the Broce drivetrain.
• Never Reuse Ring Gear Bolts: We include new ring gear bolts and threadlocker in the kit. Reusing stretched ring gear bolts is the #1 cause of ring gear separation — which is a catastrophic (and expensive) failure.
• In Stock, Ships Fast: Broce dealers often backorder drivetrain components for weeks. We have it on the shelf. Your broom will be back on the road in days, not months.

Installation Notes

⚠️ Ring and pinion installation requires specialized knowledge, tools, and experience. If you are not experienced with differential rebuilds, we strongly recommend having a qualified drivetrain shop perform the installation. Improper setup (pinion depth, backlash, bearing preload) will destroy the gears and bearings in short order.

Required Tools (Not Included)

• Dial indicator and magnetic base
• Inch-pound torque wrench (pinion bearing preload)
• Foot-pound torque wrench (ring gear bolts, pinion nut)
• Bearing puller / press
• Pinion depth gauge (or equivalent setup method)
• Gear oil (check Broce service manual for type and quantity)

General Procedure

• Drain the gear oil and remove the differential cover
• Mark and remove the carrier assembly
• Remove the old ring gear from the carrier (drill out old ring gear bolts if necessary)
• Remove the old pinion gear, seal, and bearings
• Press new pinion bearing races into the housing
• Set pinion depth using the shim kit and pinion depth gauge
• Install pinion gear with new front bearing, crush collar (if applicable), seal, and nut
• Set pinion bearing preload to spec (check service manual — typically measured in inch-pounds of rotating torque)
• Install new ring gear onto carrier using new bolts and threadlocker — torque to spec in a star pattern
• Press new carrier bearings onto the carrier
• Install carrier assembly into housing
• Set ring gear backlash using carrier bearing shims (typically 0.006"–0.010" — check service manual)
• Apply marking compound to ring gear teeth and check contact pattern under load
• Adjust pinion depth shims if contact pattern is incorrect
• Install differential cover with new gasket or RTV silicone
• Fill with the correct type and quantity of gear oil
• Test drive at low speed, check for noise, then gradually increase load
• Re-check gear oil level after 50 miles / 2 hours of operation

Frequently Asked Questions

Can I install this myself?
If you have experience with differential rebuilds and the proper tools (dial indicator, bearing press, torque wrenches), yes. If this is your first ring and pinion job, we strongly recommend having a qualified drivetrain shop do the install. Incorrect pinion depth or backlash settings will destroy the new gears — and you'll be buying another set. The gears are not difficult to physically install, but the setup and adjustment require precision.

Why can't I just replace the ring gear (or just the pinion)?
Ring and pinion gears are manufactured as a matched, lapped set. The tooth profiles are ground together at the factory to ensure proper mesh and contact. You must always replace them as a set. Installing a new ring gear with an old pinion (or vice versa) will result in excessive noise, heat, and rapid failure.

What's the difference between a "master" kit and a "basic" kit?
A master install kit includes everything: carrier bearings, pinion bearings, all races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush collar, threadlocker, marking compound, and gasket material. A "basic" kit might only include bearings and a seal — leaving you to source shims, bolts, and hardware separately. Our master kit means nothing else to buy.

What are Koyo bearings?
Koyo is the bearing brand of JTEKT Corporation — a Tier 1 Japanese manufacturer and the world's third-largest bearing producer. Koyo bearings are OEM equipment in Toyota, Honda, Ford, GM, and many industrial applications. They are precision-ground, heat-treated, and rated for the high loads and temperatures of differential service. This is not a "cheap aftermarket bearing" — this is the same quality used by major OEMs.

How do I know if my gears are bad vs. just needing bearings?
If the noise is a constant whine that changes pitch with speed, it's usually the gears. If the noise is a rumble or growl that doesn't change with speed but changes when you turn, it's usually a carrier bearing. If you see metal particles in the gear oil, the gears are shedding material and need to be replaced. In most cases, if the gears are damaged enough to make noise, the bearings are also worn — which is why we sell the complete kit.

Is this the correct ratio for my Broce 350?
Yes. This is the factory-correct ratio for the Broce Broom 350 hydraulic drive system, matching OEM part number 7066139X / 076613-9X. It is not a generic automotive ratio — it is specific to the Broce drivetrain.