Fleet # –
Year – 1994
Make – International 4600
Model – Tymco 600
Body Style – Army Street Sweeper
VIN/SN – 1HTSAZPMORH555907
Odometer Numbers – 47980
Hours –
Engine Make/Model – Navistar/International 7.3L IDI (Indirect Injection) Non-turbo, Pony Motor / Auxiliary Engine (John Deere 4239D)
Cyl – 8
Fuel Type – Diesel
Transmission Name – 4-speed hydraulic
Transmission Type – Allison AT-500
Single Axle/Dual Axle – Single Axle Dual Wheel
Tire Size/Type – 9.00R20 with 2 spares
Tire Condition – Good
Plow Size –
Dump Box Size –
Drivetrain – 4×2
GVWR – Estimated 29,500Lbs
Does the unit operate? – Yes
Does the vehicle start? – Yes
Are keys available? – Yes
Ownership Information – Transferable Registration
Mechanical Condition – Fair
Mechanical Notes – Fair to good, well maintained. The JD pony motor has 5164 hours on it.
Body Condition – Fair
Body Notes – Solid with average wear. It has a Tymco #600 Regenerative Air System type sweeper has dual operator stations, dual 43" gutter brooms, Vac/dust control system, 7.3 cubic yard hopper capable of handling a structural payload of over 10,000 lbs.
Interior Condition – Fair
Misc Info –
The following general information is web-sourced and may contain variances from the subject unit:
This vehicle is a highly specialized, military-spec 1994 International 4600 Tymco Model 600 Regenerative Air Street Sweeper. Built on a medium-duty International 4600 4×2 chassis, this 29,500 lbs GVWR dual-station vehicle relies on a mechanical 7.3L IDI naturally aspirated V8 diesel main engine, an Allison AT-500 series automatic transmission, and an independent John Deere 4239D pony motor to power its high-capacity sweeping and vacuum system.
Chassis & Drivetrain (International 4600)
The International 4600 was a legendary workhorse platform for vocational and municipal applications during the 1990s.
- Drivetrain Configuration: Single-axle, dual-rear-wheel 4×2 setup designed for tight maneuvering around curbs.
- Tires: Heavy-duty 9.00R20 radial tires mounted on multi-piece or solid steel wheels.
- Dual Operator Stations: Equipped with dual steering wheels and dual pedal setups. This allows the operator to drive safely from either the left or right side of the cab to get a direct line of sight on the gutter brooms and curb line.
- GVWR: Estimated at 29,500 lbs, positioning it firmly as a Class 7 medium-duty vehicle requiring a Commercial Driver's License (CDL) to operate in most jurisdictions.
Main Propulsion Engine (7.3L IDI Diesel)
The truck chassis is powered by the Navistar/International 7.3L IDI (Indirect Injection) V8 engine. This is a legendary, pre-electronics powerplant loved for its bulletproof reliability.
- Aspiration: Naturally Aspirated (Non-Turbo), meaning it relies purely on atmospheric pressure.
- Output: Typically produces around 185 horsepower and 338 to 358 lb-ft of torque.
- Fuel System: Completely mechanical. It uses a dependable Stanadyne DB2 rotary injection pump that requires zero computer controls or wiring harnesses to keep running.
- Key Characteristic: While it won't win any speed races, it will tolerate variable fuel quality and is incredibly simple to maintain compared to modern electronic diesels.
Main Transmission (Allison AT-500 Series)
Mated to the 7.3L engine is an Allison AT-500 series automatic transmission (most commonly the AT-545 variant for this era).
- Type: 4-speed automatic hydraulic transmission designed for medium-duty service.
- Gear Ratios: First gear starts around 3.50:1 for high low-end pulling power, moving up to a direct 1.00:1 ratio in 4th gear.
- Torque Converter: Uses a purely hydraulic, non-lockup converter setup, providing smooth starts and high shock absorption during frequent stop-and-go sweeping patterns.
Pony Motor / Auxiliary Engine (John Deere 4239D)
Because a street sweeper requires consistent vacuum pressure regardless of how fast the truck is moving, it utilizes a "pony motor" configuration. The John Deere 4239D operates independently of the truck's main engine.
- Specs: A 3.9L (239 cubic inch) 4-cylinder, naturally aspirated diesel engine.
- Purpose: It runs at a constant, optimized RPM to directly belt-drive the massive blower turbine and run the gear-driven hydraulic pumps for the broom positioning and hopper dump mechanisms.
- Output: Delivers roughly 75 to 80 horsepower, ensuring constant suction even if the truck drops down to a crawl.
Sweeper System (Tymco Model 600)
The Tymco Model 600 is an industry-standard heavy-duty sweeper. Unlike traditional mechanical sweepers that use a main broom to pick up dirt, Tymco utilizes a patented Regenerative Air System.
- Regenerative Air Blast: The pony motor spins a heavy-duty, rubber-lined aluminum blower wheel. This blower pushes a high-velocity blast of air down into one side of the pick-up head, blasting debris loose from the pavement pavement. Simultaneously, the suction side pulls the debris-laden air up into the hopper.
- No Main Broom: Because it relies on air pressure rather than a central spinning broom, it has fewer wear parts and does not exhaust dusty air back into the atmosphere.
- Gutter Brooms: Equipped with dual 43-inch gutter brooms (one left, one right) to pull debris out of the curb line and directly into the path of the wide suction head.
- Hopper Capacity: Features a massive 7.3 cubic yard hopper capable of handling a structural payload of over 10,000 lbs.
- Dust Control System: Includes a high-efficiency centrifugal dust separator paired with a large onboard water tank (typically 330 to 440 gallons) to knock down fine dust particulates and keep operations clean.
Terms of Sale:
All sales are final. No refunds will be issued. This item is being sold as is, where is, with no warranty, expressed written or implied. The seller shall not be responsible for the correct description, authenticity, genuineness, or defects herein, and makes no warranty in connection therewith. No allowance or set aside will be made on account of any incorrectness, imperfection, defect or damage. Any descriptions or representations are for identification purposes only and are not to be construed as a warranty of any type. It is the responsibility of the buyer to have thoroughly inspected this item and to have satisfied himself or herself as to the condition and value and to bid based upon that judgment solely. The seller shall and will make every reasonable effort to disclose any known defects associated with this item at the buyer request prior to the close of sale. Seller assumes no responsibility for any repairs regardless of any oral statements about the item. Seller is NOT responsible for providing tools or heavy equipment to aid in removal. Items left on seller premises after this removal deadline will revert back to possession of the seller, with no refund.
