Ambrose Equipment

2019 ROSCO RA400 at www.ambroseequipment.com2019 ROSCO RA400 at
2019 ROSCO RA400 at www.ambroseequipment.com2019 ROSCO RA400 at
2019 ROSCO RA400 at www.ambroseequipment.com2019 ROSCO RA400 at
2019 ROSCO RA400 at www.ambroseequipment.com2019 ROSCO RA400 at
2019 ROSCO RA400 at www.ambroseequipment.com2019 ROSCO RA400 at

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The ultimate output of the RA-400, which is capable of correcting over 200 road defects in a single day by a single individual, has been deployed by contractors looking to maximize productivity while finding a cost-effective patching solution. The driver operated joystick performs a four-step spray injection process typically in less than one minute per repair. Including one of the largest emulsion tanks available in the market, the RA-400 patching boom extends and retracts providing a wide patching range with minimal required maintenance.

Performance Features:
• Front-Corner Mounted Boom for Greater Working Range
• VORTEC System (Vacuum Operated Rock Transfer Emulsion Control)
• 10’ 3” x 7’ (3.12 x 2.13 m) Rectangular Aggregate Hopper
• 300 Gallon (1,135 l) Liquid Asphalt Emulsion Tank
• Can-Bus Plus 1 In-Cab Control System
• One Person Operation, Easy-to-Use Joystick Controls
• Industry Leading Hydraulic “Patch on the Go” System
• Tier 4 Final 65 HP (48.4 kw) Kubota Diesel Auxiliary Engine
• 30” x 60” (.762 x 1.52 m) Rear-Mounted Arrow Board
• Computerized material application rate control

Job Application:
• Road repair
• Pothole patching
• Shoulder erosion
• Alligator cracking repair


Auxiliary Engine
Output (gross intermittent): 65 hp (48.4 kw) @ 2,600 rpm | Tier 4 Final, naturally aspirated 4 cylinder Kubota diesel engine | In-cab aux engine controls at operator’s station with tachometer, hour meter and warning system
Overnight heating by two 4,500 watt, 240 volt thermostatically controlled heater elements, located in water heat exchanger tube | Alternate heat source provided to maintain heat on work site, regulated automatically to prevent over or under heating of materials | Asphalt line heated to prevent clogging during operation | Tank mounted 5” (127 mm) dial thermometer and emulsion level indicator both visible from cab | Tank size: 300 gallons (1,135.6 l) | Tank fill opening: 12” (305 mm)
Styrofoam-incased liquid asphalt emulsion tank
Aggregate System
Low profile, 5 cubic yard (3.82 cubic m) hopper, or 11,000 lbs (4,990 kg) | Rectangular welded 10’ 3” x 7’ (3.12 x 2.13 m) aggregate hopper | In-cab controlled vibration system | Dual electric over hydraulic activated hopper lids, rear access open/close switch | Cab controlled adjustable, feed slide gate meters aggregate flow | System will accept aggregates up to .75” (19 mm) | Plus+1 system store settings: rock flow, emulsion flow and air flow
System utilizes no mechanical or moving parts to move aggregate | Ease of access to clean and service the slide gate and sub systems | Conveyors and/or paddle feeders are NOT acceptable | Venturi nozzle with cleanout
Feed and Flush System
Air pressurized system to deliver sufficient asphalt to completely cover aggregate at full feed capacity | Delivery system capable of maintaining 60 psi | Flush system 30 gallon (113.5 l) minimum capacity with provisions for storing used flush material | Asphalt tank is equipped with a three-way valve for flush, delivery and shut-off
Optional Equipment
Back-up/reverse camera with in-cab color display | LED lights in the 30” x 60” (.76 x 1.5 m) arrow board, 13 light | Larger arrow board 48” x 96” (1.2 x 2.4 m) | LED night working light package, 2 front, 1 rear | LED lights, stop, turn signals and tail lights | 240V heater conversion in lieu of 120V | Emergency triangle kit, flare, fire extinguisher | Jet flush system


26’ (7.9 m) with boom retracted | 38’ 5” (11.7 m) with boom fully extended
8’ 6” (2.59 m)
10’ (3 m)
18,000 lbs (8,164 kg) with standard chassis


Cab-over Peterbilt 220 (or equivalent) | Front axle: 12,000 lbs (5,443 kg) | Rear axle: 21,000 lbs (9,525 kg), rear springs rated for 23,000 lbs (10,433 kg) | Wheelbase: 164” (4.165 m) | Cab-to-axle: 153” (3.88 m) | *Rosco to review truck specifications prior to bid and/or order
240 hp (179 kw) @ 2,400 rpm diesel engine
Gross Vehicle Weight
33,000 lbs (14,969 kg)


Dual hydraulic pump | 28 gallons per minute (105.9 l per minute) for blower function | 9 gallons per minute (34 l per minute) for all other functions driven from auxiliary engine
Tank Reservoir
20 gallons (75.7 l)


Front-corner mount boom storage system | Eliminating windshield obstruction in stow position | One piece, double acting boom with three-stage telescoping aggregate delivery tube | Cable/hose carrier, heated water lines with individual nozzle shut-offs | Double acting swing and hoist hydraulic cylinders | Position censored safety system that does not allow boom swing into traffic beyond center line | Capable swing operations to shoulder and center with caution
Reach, Extracted
7’ 5” (2.3 m)
Reach, Extended
11’ 5” (3.5 m)
Patching Area
42 ft² (12.8 m²)

Compressed Air System

High volume, low pressure. Positive displacement blower driven by truck hydraulics motor | Hydraulically-driven blower with variable CFM from 0-850
Capable of
850 cfm @ 2,850 rpm

Operator Controls

Electric hydraulic flow control for independent operation allows patching while moving at slow speeds
Single Joystick Control
Boom swing, extend/retract and push button for up/down
Push Button Operates
Blow out mode, emulsion on/off, blower on/off, blow inc/dec, rock flow inc/dec and emulsion inc/dec

General Comments

The technical data contained herein is subject to change due to continuous engineering and development.

Ambrose Equipment

get a quote now!


1401 Hooksett Road Hooksett, NH 03106

Phone: (603) 644-8787 | Fax: (603) 644-8747
Hours: Monday-Friday (7 AM-5 PM)


1 Madison Street Plainville, MA 02762

Phone: (508) 643-0044 | Fax: (508) 643-0034
Hours: Monday-Friday (7 AM-5 PM)

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