Caterpillarasphalt paverasphalt screed

Caterpillar AS2251

Maintenance schedule, common problems & OEM parts breakdown

The Cat AS2251 is a hydraulically extendible asphalt screed, not a self-propelled paver. It has no engine of its own: it mounts to the front of a Cat paver tractor and draws its hydraulic and electrical power from that tractor. Standard paving width is 2.5 m (8'2"), extended wider through bolt-on or hydraulic power-extending mainframe sections in front-mount or rear-mount configurations. Cat offered the AS2251 in both diesel-burner and electric-heat versions for warming the screed plates. It was built to fit Cat's mid-size paver tractor line, including the AP-1000B, AP1055B, AP800D, and AP-655C, and was on the market roughly from the mid-1990s through the 2000s alongside that generation of tractors.

In the used and parts market, the AS2251 shows up as a wear and replacement attachment rather than a machine buyers shop for on its own. It trades alongside serviced or rebuilt paver tractors, or gets sourced separately when a screed's plates, extension slides, or heating system are worn out and a compatible unit is needed to keep an older AP-series tractor working. Configuration matters: diesel-heat versus electric-heat, front-extension versus rear-extension, and bolt-on versus power-extending mainframes are not interchangeable, so buyers search the AS2251 model number specifically to match the control interface and hydraulic hookups of their tractor rather than treating it as a generic screed.

Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.

Caterpillar AS2251 specifications

Engine

Identity note	AS2251 is a hydraulically-extendible asphalt screed (a towed/mounted paver attachment), not a self-propelled machine. It carries no engine of its own.
Power source	Draws hydraulic flow from the paving tractor it is mounted to; electrical system operates at 24V to match the tractor. Compatible tractors include AP-1000B, AP1055B, AP800D and AP-655C paver bases.

Weights

Operating weight (approximate)	3214 kg (7,070 lb)
305 mm (12") bolt-on extension weight	73 kg (160 lb)
610 mm (24") bolt-on extension weight	152 kg (335 lb)
Shipping weight / ground pressure	Not published — screed has no wheels or tracks of its own; it is carried on the paving tractor's tow arms.

Dimensions

Length without end gates	1478 mm (58")
Length with end gates	1933 mm (76")
Width without end gates	2.6 m (8' 9")
Width with end gates	2.8 m (9' 3")
Height	2309 mm (91")
Standard paving width	2.5 m (8' 2")
Paving range, hydraulically extendible	2.5 - 4.27 m (8' 2" - 14' 5")
Paving range, with bolt-on extensions	2.5 - 6.10 m (8' 2" - 20' 5")
Paving range, with cutoff shoes	down to 1.9 m (6' 2")
Screed plate width (front to back)	457 mm (18") per plate, main and extenders
Walkway width	476 mm (18.75")
End gate length	1283 mm (50.5")

Performance

Vibrator speed	Adjustable 0 - 50 Hz (0 - 3,000 vpm), main screed and extenders synchronized
Extender slope range	+10% to -3% (+76 mm to -25 mm)
Crown range	+10% to -3% (+133 mm to -38 mm)
Extender height adjustment increments	6.4 mm (0.25") per graduation
Screed plate material	Abrasion-resistant alloy steel, 360-440 Brinnell hardness
Travel speed / gradeability	Not applicable — screed is not self-propelled; travel performance is governed by the host paving tractor.

Service capacities (summary)

Screed plate heating system	Four diesel-fuel burners (two on main screed, one per extender) with glow-plug ignition and a built-in 15-minute heating timer to prevent plate overheating.
Fuel tank capacity	Not separately published; burner fuel supply is integral to the heating system, sized for the timed heating cycle rather than continuous operation.
Hydraulic system	No dedicated onboard reservoir — extenders and vibrators run on hydraulic flow supplied by the paving tractor through O-ring face seal (ORFS) fittings and high-pressure hose.
Engine oil / cooling system	Not applicable — screed has no engine.

Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.

AS2251 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable — the AS2251 has no engine of its own	Not applicable
Cooling system	Not applicable — the AS2251 has no engine or radiator of its own	Not applicable
Fuel tank	Not applicable — the AS2251 carries no fuel tank of its own	Not applicable
Transmission/powertrain	Not applicable — the AS2251 has no transmission of its own	Not applicable
Final drives	Not applicable — the AS2251 has no final drives	Not applicable
Hydraulic system and tank	Not applicable as a standalone reservoir — screed extension, crown, and tilt cylinders run off the towing paver's hydraulic system and share its tank capacity and fluid	Match the host paver's hydraulic fluid spec (Cat HYDO Advanced or equivalent per that paver's OMM); no separate screed-side hydraulic fluid recommendation is published
Axles/differentials	Not applicable — the AS2251 has no axles or differentials	Not applicable
Grease points (extension tubes, crown/tilt adjustment linkage, vibrator and auger drive bearings)	Spec only — no fill volume published; apply grease at each fitting per the interval schedule until purge is visible at the joint	Cat Multipurpose Grease (MPGM), NLGI Grade 2 lithium-complex EP grease; no separate cold-climate viscosity grade is published for this grease

Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.

Caterpillar AS2251 maintenance schedule

Service interval	Tasks
Every 50 h	Grease extension slide rails and tube bearings at both ends of the screed frame before each shift. Inspect screed plates and nose bar for uneven wear, gouging, or bowing across the paving width. Check diesel burner flame pattern or electric heating element output for even heat across all plate zones before startup. Cycle extensions fully in and out and clear packed asphalt from the tubes before shutdown. Inspect hydraulic hoses and cylinder rods at the extension, crown, and tilt actuators for leaks, chafing, or loose fittings. Check thickness control screw linkage for free movement and confirm locking collars are secure.
Every 250 h	Grease crown/tilt pivot points and vibrator or auger drive bearings on the full schedule, not just the daily points. Inspect auger and vibrator shaft bearings for play, heat, or abnormal noise. Check burner nozzle, igniter, and fuel line fittings (diesel-heat units) or heating element wiring and connectors (electric-heat units) for wear and corrosion. Inspect screed plate mounting bolts and shims; retorque or reset as needed. Check hydraulic extension cylinder alignment and mounting hardware for wear.
Every 500 h	Inspect crown/tilt linkage bushings and pins for wear; replace any with excess play. Check auger drive chain or gearbox oil level and condition where fitted. Test heating system thermostat or temperature controller calibration across all zones. Inspect main frame-to-extension wear strips and slide pads; adjust or replace as needed. Inspect the electrical harness and screed generator/control connections for chafe points and corrosion.
Every 1,000 h	Replace hydraulic filter elements serving the screed extension, crown, and tilt circuits per the host tractor's schedule. Inspect screed plates and nose bar for wear beyond service limits; replace as needed. Inspect and resurface or replace worn extension slide pads and rails. Pull vibrator bearing seals for inspection; repack or replace grease and seals. Check burner fuel lines or electric heating element resistance for degradation.
Every 2,000 h	Tear down and inspect the crown/tilt actuator and pivot assembly; replace worn pins and bushings. Check the main frame and extension tubes for warpage from repeated heat cycling; true up or replace as needed. Replace vibrator and auger drive bearings. Fully inspect and recalibrate the thickness control screw mechanism end to end. Evaluate the heating system (burner assembly or electric elements) for full component replacement versus spot repair.

Servicing the AS2251 beyond the schedule

Predictive Maintenance & Fluid Analysis

The AS2251 has no engine or transmission of its own, so predictive care centers on the hydraulic oil supplied by the host tractor and on the screed's own wear points. Sample and trend hydraulic fluid condition at the extension, crown, and tilt circuits for contamination that signals cylinder seal or hose wear. Track grease consumption and color at extension slides and crown/tilt pivots for early bearing wear. Use a thermal camera across the screed plates each burner or electric-heat cycle to catch uneven heating before it shows up as paving mat defects.

Corrective & Common Repairs

Typical AS2251 repairs involve the extension and heating systems rather than any driveline. Worn or gouged screed plates and nose bars cause mat texture problems and need replacement once below service limits. Extension tubes bind when slide pads wear or debris packs into the tunnels, so clean and re-shim before forcing a stuck extension. Diesel burner units commonly need igniter, nozzle, or fuel-line repairs; electric-heat units more often lose individual heating elements or connectors. Leaking extension, crown, or tilt cylinders are the most frequent hydraulic complaint.

Overhaul & Rebuild Points

A full AS2251 rebuild focuses on the crown/tilt pivot assembly, extension slide system, and heating package. Pivot pins and bushings wear from constant on-the-go crown and tilt adjustment and should be replaced as a set rather than piecemeal. Extension tubes and slide pads take the brunt of heat-cycling and asphalt abrasion, so resurfacing or full replacement is common at higher hours. Vibrator and auger drive bearings and seals are wear items that get replaced together during an overhaul. Heating system components, burner assemblies or electric element banks, are evaluated for full replacement once individual repairs stop holding.

Seasonal & Environment Servicing

Before cold-weather paving, test diesel burner ignition and flame stability or, on electric-heat units, load-test each heating element bank; both lose heat-up speed in low ambient temperatures. Retract and clean extension tubes before winter storage to keep asphalt residue from cementing them shut. Check hydraulic hoses for cold-weather stiffness and cracking. Ahead of the paving season, verify crown/tilt and thickness control screw ranges are free and recalibrated, and confirm screed plates and nose bar are within wear limits before the first mat of the year.

AS2251 common service parts

Part number	Part	Notes
9S-8752	Nut-Full	Scheduled service item	Check fitment →
245-9061	Harness As-Screed	Scheduled service item	Check fitment →
250-6705	Element-Heating	Scheduled service item	Check fitment →
250-6706	Element-Heating	Scheduled service item	Check fitment →
250-6712	Element-Heating	Scheduled service item	Check fitment →

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AS2251 attachments & work tools

Machine identity note

AS2251 is a Cat asphalt screed, not a self-propelled paver. It mounts to a tractor unit (AP-1000B, AP1055B, AP800D, AP-655C) and draws hydraulic flow and 24V electrical power from that tractor. Entries below cover the screed's own bolt-on/optional hardware rather than attachments carried by a separate host machine.

Hydraulic screed extenders

Two front-mounted, hydraulically driven extenders vary paving width within the standard range, 2.5-4.27 m (8'2"-14'5") on the AS2251 base screed (a close-model AS2301 sibling covers 3.05-5.49 m/10-18'). Extenders ride on 51 mm (2") diameter tubes for torsional rigidity and can be controlled from the tractor, the main screed console, or remote boxes at each extender end.

Bolt-on screed extensions

Mechanical width extensions bolt onto the heavy-duty extender frames to push paving width up to about 6.1-6.2 m (20'5"), varying slightly by source. Offered in 305 mm (12") and 610 mm (24") widths; they pick up screed heat by convection from the main screed rather than carrying their own burners, and add roughly 73 kg (160 lb) and 152 kg (335 lb) respectively.

Cutoff shoe package

Shoes reduce paving width down to about 1.9 m (6'2") for narrow lanes and shoulders. Available in 305 mm (12") or 610 mm (24") widths with 76 mm (3") increment adjustment, used when the job calls for less than the 2.5 m standard width.

Vibratory compaction and screed heat

Main screed and extenders share a hydraulically driven vibrator system for initial compaction, adjustable from 0 to 50 Hz (about 3,000 vpm). Screed plate heating is by four diesel burners as standard (two on the main screed, one per extender) with a 15-minute auto-shutoff timer; an electric-heat variant is also offered, which adds a tractor-mounted generator in place of the diesel burner set.

Screed plates and nose bar

Main and extender screed plates are abrasion-resistant alloy steel (roughly 360-440 Brinnell), about 457 mm (18") front-to-back, mounted on a trailing-edge adjusting/leveling system that removes the need for shims. Curved nose bar aids precompaction and material flow ahead of the plate.

End gates

Bolt-on, spring-loaded end gates about 1283 mm (50.5") long follow the paved surface profile to hold a clean longitudinal joint. False-wall design limits mix contact with the sliding gate face, and a replaceable wear strip extends service life.

Power crown and height control kits

Manual hand-crank adjustment is standard for main screed crown (+10% to -3%, roughly +133/-38 mm) and extender height/slope (+10% to -3%, roughly +76/-25 mm). Optional electric motor-driven gearboxes convert crown and extender-height adjustment to fingertip switch control from the screed consoles.

Thickness control screw configurations

Mat-depth thickness screws are offered in four thread variants — clockwise standard, counterclockwise standard, clockwise Acme, or counterclockwise Acme — selected to match operator preference/handedness rather than paving condition.

Pre-strikeoff shields

Patented pair of adjustable shields at the front of the screed meter material into the main screed to smooth mat texture and reduce segregation; they track the main screed's leading edge automatically when thickness screws are adjusted, with manual fine-tune handles also provided.

All AS2251 assemblies by section

Every catalogued assembly group for the Caterpillar AS2251. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Controls

206-6698 Adjuster Gp-Height

10***24	Tube As; (Vertical)	4
10***39	Key-Square	2
10***40	Spacer; (10.74x17.14x7-mm Thk)	2
11***39	Spacer; (10.5x18x21-mm Thk)	8

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197-5277 Adjuster Gp-Manual -Crown

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
13***49	Cable As	1
19***77	Adjuster Group-Manual; -Crown	1
1F***47	Bushing	1

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201-5130 Adjuster Gp-Manual -Crown

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	2
13***49	Cable As	2
1F***47	Bushing	2
1V***62	Ring-Retaining	2

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165-4722 Adjuster Gp-Power

16***22	Adjuster Group-Power	1
17***83	Stud	2
27***06	Motor Group-Power Adjuster	2
4L***54	Capscrew; (3/8-16x21 In) (Gd8) (Hex Hd) (4-Roller)	2

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197-9844 Chain Gp-Screed

10***87	Link-Connecting	1
13***39	Chain	71
19***33	Link-Offset	1
19***44	Chain Group-Screed	1

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165-4720 Control Gp-Thickness -Lh Thread

13***21	Rod-Threaded; (1-5-Acme Thd, Lh)	2
13***24	Sleeve As-Adjustment	2
16***20	Control Group-Thickness; -Lh Thread	1
1J***36	Pin-Spring; (Spring)	2

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165-4721 Control Gp-Thickness -Rh Thread

13***22	Rod-Threaded; (1-5-Acme Thd)	2
13***25	Sleeve As-Adjustment	2
16***21	Control Group-Thickness; -Rh Thread	1
1J***36	Pin-Spring; (Spring)	2

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165-4718 Control Gp-Thickness -Standard Cw

13***07	Rod	2
13***08	Sleeve As-Adjustment	2
16***18	Control Group-Thickness; -Standard Cw	1
1J***36	Pin-Spring; (Spring)	2

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165-4719 Control Gp-Thickness -Standard Ccw

13***20	Rod-Threaded	2
13***23	Sleeve As-Adjustment	2
16***19	Control Group-Thickness; -Standard Ccw	1
1J***36	Pin-Spring; (Spring)	2

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197-5288 Crown Gp

10***39	Key-Square	1
11***50	Sprocket; (12-Teeth)	1
19***83	Bolt-Shoulder; (3/8-16x0.63-In)	1
19***10	Bearing Group-Screed	2

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197-5278 Crown Gp-Power

19***78	Crown Group-Power	1
23***74	Motor Group-Power Adjuster	1
4L***54	Capscrew; (3/8-16x21 In) (Gd8) (Hex Hd) (4-Roller)	2
8T***96	Washer-Hard- Line From Pipe As. To Gear	2

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196-2503 Jack Gp-Height Adjuster

10***64	Bearing-Thrust	2
11***49	Worm	1
19***03	Jack Group-Height Adjuster	1
19***44	Cap	1

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277-2006 Motor Gp-Power Adjuster

07***77	Bushing-Terminal	2
10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
10***87	Sleeve; (26-cm)	0
12***07	Screw-Hex; (10-16x1-In)	8

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165-3729 Motor Gp-Power Adjuster

07***77	Bushing-Terminal	2
10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
10***87	Sleeve; (26-cm)	0
12***07	Screw-Hex; (10-16x1-In)	6

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236-0474 Motor Gp-Power Adjuster

07***77	Bushing-Terminal	2
10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
10***87	Sleeve; (26-cm)	0
12***07	Screw-Hex; (10-16x1-In)	6

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197-9850 Shaft Gp-Drive -Front

17***69	Kit-Bearing; (Universal Joint)	1
19***11	Shaft As	1
19***12	Spindle As	1
19***50	Shaft Group-Drive; -Front-Non-Actuated	1

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197-9849 Shaft Gp-Drive -Rear

17***69	Kit-Bearing; (Universal Joint)	1
19***11	Shaft As	1
19***45	Spindle As	1
19***49	Shaft Group-Drive; -Rear-Actuated	1

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Electrical And Starting System

122-9303 Buffer Gp-Sensor -Material Height

10***03	Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge)	1
12***03	Buffer Group-Sensor; -Material Height-Propel Forward, Reverse-Propel Speed Dial	2
18***35	Pin-Connector; (16-Ga To 18-Ga)	3
19***01	Plate As	1

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232-0728 Cover Gp-Wiring Harness

10***05	Plate	3
15***71	Kit-Connecting Plug; (4-Pin)	2
17***15	Strap; (Dual Clamp)	2
17***45	Kit-Receptacle; (2-Pin)	1

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322-9153 Sensor Gp-Temperature

10***05	Plate	3
17***15	Strap; (Dual Clamp)	2
22***81	Film-Warning; -Universal	1
22***47	Film-Identification; (Service Codes)	1

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334-7882 Sensor Gp-Temperature

08***51	Film-Warning; (Lighting Screed Burner)	2
10***01	Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge)	1
10***03	Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge)	1
10***13	Receptacle As-Connector; (70-Pin)	1

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250-6718 Wiring Gp-Heater -Electric

10***01	Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge)	1
10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
10***03	Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge)	1
10***13	Receptacle As-Connector; (70-Pin)	1

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241-6812 Wiring Gp-Screed -Electric Heat

17***65	Plug As-Connector	1
19***96	Panel Group-Electronic; -Material Height, Rh	1
19***97	Panel Group-Electronic; -Material Height	1
23***35	Handrail As; (Lh)	1

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241-6809 Wiring Gp-Screed -Electric Heat

19***98	Panel Group-Electronic; -Material Height-Rh	1
19***99	Panel Group-Electronic; -Material Height-Lh	1
22***64	Harness As-Screed; (Paver To Screed)	1
23***35	Handrail As; (Lh)	1

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206-6685 Wiring Gp-Screed -Diesel Heat

17***65	Plug As-Connector	1
19***97	Panel Group-Electronic; -Material Height	2
20***85	Wiring Group-Screed; -Diesel Heat	1
23***35	Handrail As; (Lh)	1

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243-1843 Wiring Gp-Screed -Electric Heat

00***39	Bearing-Aligning; (Self Aligning)	1
14***61	Plug	2
14***62	Seal-Washer	2
22***51	Kit-Seal; (Hydraulic Cylinder)	1

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244-4975 Wiring Gp-Screed -Electric Heat

10***02	Valve Group-Solenoid; -Extender, Slope	2
14***18	Connector As	2
14***74	Elbow As	2
14***78	Elbow, 90°,-6 Orb /-6 Orfs; (90°) (-6 Orbx-6orfs)	2

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244-4976 Wiring Gp-Screed -Electric Heat

10***02	Valve Group-Solenoid; -Extender, Slope	2
14***18	Connector As	2
14***74	Elbow As	2
14***78	Elbow, 90°,-6 Orb /-6 Orfs; (90°) (-6 Orbx-6orfs)	2

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243-1844 Wiring Gp-Screed -Electric Heat

20***62	Kit-Seal; (Extender Cylinder)	0
24***44	Wiring Group-Screed; -Electric Heat	1
5D***86	Locknut; (7/8-14-Thd)	1

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244-4974 Wiring Gp-Screed -Electric Heat

20***62	Kit-Seal; (Extender Cylinder)	1
24***74	Wiring Group-Screed; -Electric Heat	1
5D***86	Locknut; (7/8-14-Thd)	1

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Electrical System

116-4490 Box Gp-Extension

09***17	Washer	4
10***54	Box-Extension	1
10***48	Harness As-Screed; (Extender)	1
11***90	Box Group-Extension	1

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229-3132 Box Gp-Screed Control -Rh

10***04	Kit-Receptacle; (4-Pin)(Start Switch)	1
15***60	Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness)	3
15***74	Kit-Connecting Plug; (6-Pin)(Cat Electronic Display Harness)	2
19***03	Plate; (Rh)	1

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229-3131 Box Gp-Screed Control -Lh

10***04	Kit-Receptacle; (4-Pin)(Start Switch)	1
15***60	Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness)	3
15***74	Kit-Connecting Plug; (6-Pin)(Cat Electronic Display Harness)	2
19***02	Plate; (Lh)	1

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306-7442 Box Gp-Screed Control

06***51	Clamp	1
12***49	Lockwasher	1
16***71	Terminal As; (18-Ga To 20-Ga)	2
18***14	Nut; (1-11/16-18-Thd)	1

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229-3133 Box Gp-Screed Control

06***51	Clamp	1
12***49	Lockwasher	1
15***55	Kit; (Connecting Plug) (12-Pin) (Includes Plug As Wedge & Interface Seal)	1
15***56	Kit-Connecting Plug; (12-Pin)	1

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196-1299 Panel Gp-Electronic -Material Height-Lh

10***03	Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge)	1
11***83	Relay-Time Delay; (Electric Heat)	1
12***03	Buffer Group-Sensor; -Material Height-Propel Forward, Reverse-Propel Speed Dial	1
18***35	Pin-Connector; (16-Ga To 18-Ga)	3

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196-1298 Panel Gp-Electronic -Material Height-Rh

10***03	Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge)	1
10***05	Kit-Receptacle; (6-Pin)(Display Monitor Harness)	1
19***98	Panel Group-Electronic; -Material Height-Rh	1
19***01	Plate As	1

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196-1297 Panel Gp-Electronic -Material Height

10***03	Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge)	1
10***05	Kit-Receptacle; (6-Pin)(Display Monitor Harness)	1
11***83	Relay-Time Delay; (Electric Heat)	1
19***97	Panel Group-Electronic; -Material Height	1

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196-1296 Panel Gp-Electronic -Material Height, Rh

15***60	Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness)	1
15***71	Kit-Connecting Plug; (4-Pin)	1
18***36	Socket-Connector; (16-Ga To 18-Ga)	6
19***96	Panel Group-Electronic; -Material Height, Rh	1

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Frame And Body

221-4345 Arm Gp-Drop

22***45	Arm Group-Drop	1
24***58	Heater As-Screed	1
24***66	Plate As	1
24***70	Plate As	1

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206-6689 Carriage Gp-Extender

13***89	Clip; (Ladder)	1
20***89	Carriage Group-Extender	1
24***70	Plate As	1
25***75	Bracket	2

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206-6699 Deflector Gp

20***99	Deflector Group	1
24***58	Heater As-Screed	2
24***61	Harness As-Screed; (Heater Element)	1
24***64	Plate As	1

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206-6690 Frame Gp-Screed

18***31	Bolt-Special; (1 1/4-12-2athd)	4
1K***72	Locknut Horn To Guard	4
20***90	Frame Group-Screed	1
21***69	Stud	4

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216-6989 Gate Gp-End

18***31	Bolt-Special; (1 1/4-12-2athd)	4
1K***72	Locknut Horn To Guard	4
21***69	Stud	4
21***89	Gate Group-End	1

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250-6710 Plate Gp-Screed -Electric Heat, Extender, Rh

10***95	Bearing	2
10***35	Key-Square; (3/16in X 3/4in Lg)	2
10***51	Harness As-Screed; (Extension)	1
11***76	Shaft Group-Drive; -Eccentric Weight	1

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250-6716 Plate Gp-Screed -Electric Heat, Extender, Lh

24***84	Extension Group-Screed; -Electric Heat With Vibration, 24-In	1
25***16	Plate Group-Screed; -Electric Heat, Extender, Lh	1
25***11	Relay As; (24-Volt)(Screed Control)	1
30***55	Wire As	1

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245-9080 Plate Gp-Screed -Electric Heat, 24-In

24***80	Plate Group-Screed; -Electric Heat, 24-In	1
25***75	Bracket	5
25***12	Element-Heating; (Outer)	1
25***13	Element-Heating; (Inner)	1

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250-1074 Plate Gp-Screed -Electric Heat

10***95	Bearing	2
10***35	Key-Square; (3/16in X 3/4in Lg)	2
10***51	Harness As-Screed; (Extension)	1
11***76	Shaft Group-Drive; -Eccentric Weight	1

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311-6561 Plate Gp-Screed -Electric Heat, Main

02***87	Fitting-Grease; (Universal Joint)	1
24***28	Seal	1
24***41	Kit-Bearing; (Drive Shaft)	2
2F***26	Setscrew; (3/8-16x0.375-In)	4

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250-6703 Plate Gp-Screed -Electric Heat, Main

1A***68	Nut	4
20***59	Plate	1
20***63	Frame As	1
20***67	Plate As	1

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206-6695 Plate Gp-Screed -Diesel Heat

20***95	Plate Group-Screed; -Diesel Heat	1
25***75	Bracket	16
25***05	Element-Heating; (Outer)	2
25***06	Element-Heating; (Inner)	2

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245-9079 Plate Gp-Screed -Electric Heat, 12-In

24***79	Plate Group-Screed; -Electric Heat, 12-In	1
25***75	Bracket	5
25***11	Plate As; (Rh)	1
25***12	Element-Heating; (Outer)	1

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Fuel System

206-6693 Burner Gp -Diesel Heat

03***12	Screw-Forming; (10-24x0.5-In)	16
10***98	. Roller (With Bushing), Housing-Blower	4
10***25	Adapter	4
11***40	Valve-Check; (Fuel Flow)	4

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206-6686 Lines Gp-Burner -Diesel Heat

00***10	Tee; (Pipe)	1
08***91	Adapter	1
11***83	Connector	1
12***78	Valve As-Shutoff	4

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Hydraulic System

278-0617 Cylinder Gp-Hydraulic

10***40	Spacer; (10.74x17.14x7-mm Thk)	4
10***84	Pin As	4
14***13	Adapter Group	1
14***36	Adapter; (Straight) (-6 Orb X -6 Orfs)	2

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206-6682 Cylinder Gp-Hydraulic -Extender

10***02	Valve Group-Solenoid; -Extender, Slope	2
10***40	Spacer; (10.74x17.14x7-mm Thk)	4
10***84	Pin As	4
14***13	Adapter Group	1

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197-9766 Cylinder Gp-Hydraulic -Slope

14***78	Elbow, 90°,-6 Orb /-6 Orfs; (90°) (-6 Orbx-6orfs)	2
15***36	Elbow As.	2
16***32	Pin	2
16***44	Adjuster	2

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311-4880 Lines Gp-Extender

06***39	Seal-O-Ring	1
16***21	Kit-Bearing; (Vibratory Motor)	1
31***80	Lines Group-Extender	1
4D***86	Seal--Bushing To Selector Valve Group	1

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206-6691 Lines Gp-Extender

10***05	Plate	7
14***09	Adapter As	2
14***17	Adapter, -12 Orb / -16 Orfs	1
14***18	Connector As	8

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311-1959 Lines Gp-Slope

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	2
11***21	Coil	2
13***39	Valve-Block	1
15***50	Kit-Solenoid Valve; (Bank Valve)	1

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197-5285 Lines Gp-Slope

19***85	Lines Group-Slope	1
19***47	Valve Group-Control; (Vibratory)	1
19***41	Cartridge As-Valve	1
20***57	Kit-Seal; (Flow Control Valve)	1

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232-0726 Lines Gp-Vibratory

10***90	Coupling	4
10***95	Bearing	8
10***39	Key-Square	4
10***33	Key-Square; (1/4in X 3/4in Lg)	4

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8i-0721 Motor Gp-Gerotor -Vibratory

19***83	Bolt-Shoulder; (3/8-16x0.63-In)	2
19***01	Bracket	2
19***03	Platform As; (Extender)	2
19***04	Plate	2

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208-1631 Valve Gp-Control -Vibratory

19***83	Bolt-Shoulder; (3/8-16x0.63-In)	2
19***01	Bracket	2
19***03	Platform As; (Extender)	2
19***04	Plate	2

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300-0505 Valve Gp-Solenoid

18***25	Scraper; (Brass)	4
19***57	Scraper As	4
1A***68	Nut	6
20***07	Shaft	4

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332-1453 Valve Gp-Solenoid

16***24	Rod-Threaded	4
16***25	Rod-Threaded	4
16***26	Turnbuckle	4
16***29	Rod-Threaded	2

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103-3602 Valve Gp-Solenoid

10***02	Valve Group-Solenoid; -Extender, Slope	1
11***99	Pin As-Pivot	2
13***20	Shaft	2
13***77	Lockout	2

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197-5294 Vibratory Gp

10***68	Grip-Handle	2
10***84	Screw-Flat Head; (1/2-13x1.5-In)(22.22x7.94x1/2-13 Thd)	6
10***82	Scale; (Rh)(Screed Ext)	1
10***83	Scale-Screed Extender-Lh	1

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Implements

185-5419 Extension Gp-Screed -Diesel Heat, 12-In

11***83	Connector	1
14***13	Adapter Group	1
18***19	Extension Group-Screed; -Diesel Heat, 12-In	1
19***58	Bracket As	1

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245-9084 Extension Gp-Screed -Electric Heat With Vibration, 24-In

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	2
15***79	Film-Instruction; (Grease)(Instructions)	2
16***89	Tack-Fastener	4
18***68	Plate-Serial Number	1

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185-5408 Extension Gp-Screed -Diesel Heat, 24-In

10***82	Shoe As-Cutoff; (1 Foot)	1
10***88	Shoe As-Cutoff; (2 Foot)	1
18***08	Extension Group-Screed; -Diesel Heat, 24-In	1
1K***72	Locknut Horn To Guard	2

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256-1132 Extension Gp-Screed -Electric Heat, 1-Ft

11***99	Nipple-Pipe	1
12***78	Valve As-Shutoff	1
14***37	Connector As	1
15***68	Tee Group	1

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256-1133 Extension Gp-Screed -Electric Heat With Vibration, 2-Ft

25***33

Extension Group-Screed; -Electric Heat With Vibration, 2-Ft

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245-9083 Extension Gp-Screed -Electric Heat, 12-In

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	2
15***79	Film-Instruction; (Grease)(Instructions)	2
16***89	Tack-Fastener	4
18***68	Plate-Serial Number	1

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112-1276 Shaft Gp-Drive -Eccentric Weight

11***76

Shaft Group-Drive; -Eccentric Weight

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104-4482 Shoe Gp-Cutoff

10***82

Shoe Group-Cutoff

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Machine Arrangement

241-6810 Installation Ar-Screed -Electric Heat

24***10	Installation Ar-Screed; -Electric Heat	1
24***12	Wiring Group-Screed; -Electric Heat	1
25***74	Plate Group-Screed; -Electric Heat	1
25***18	Wiring Group-Heater; -Electric	1

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241-6807 Installation Ar-Screed -Diesel Heat

20***85	Wiring Group-Screed; -Diesel Heat	1
20***86	Lines Group-Burner; -Diesel Heat	1
20***93	Burner Group; -Diesel Heat	1
20***95	Plate Group-Screed; -Diesel Heat	1

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241-6806 Screed Ar

19***85	Lines Group-Slope	1
19***88	Crown Group	1
19***94	Vibratory Group	1
20***89	Carriage Group-Extender	1

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Operator Station

247-2709 Platform Gp-Operator

10***68	Grip-Handle	2
10***35	Support As	2
10***09	Chain; (14-In Each)	0
14***55	Support As	2

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Service Equipment And Supplies

231-4644 Lines Gp-Spray Down

23***44

Lines Group-Spray Down

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254-0055 Plate & Film Gp

25***55

Plate & Film Group

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231-6641 Washdown Gp

23***41

Washdown Group

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AS2251 serial number reference

The screed's PIN plate is riveted to the screed frame near the tow/hitch end that couples to the paver's tractor unit, in the same style as other Cat attachment PIN plates - it is a separate plate from the paver's own PIN. It reads as an 8-character PIN: a 3-character prefix identifying the screed model and production series, followed by a 5-digit sequence number (e.g. ASP00123). Since the screed carries its own serial identity apart from the tractor it is mounted to, check the screed's own plate rather than assuming it matches the paver's serial range.

Prefix	Identifies	Notes
ASP	AS2251 Screed - base catalog series	Parts catalog lists AS2251 Screed ASP00001-UP under the hydraulic system group (extender/slope solenoid valve group). Screed mounts to Cat AP-1000B, AP1055B, AP800D and AP-655C tractor units as the 2.5 m (8'2") standard extendable screed.
CWF	AS2251 Screed - diesel-heat wiring block (confirm with dealer)	Parts catalog lists a separate AS2251 Screed range CWF00001-UP under the electrical and starting system group, tied to a diesel-heat screed wiring group entry, distinct from the ASP block. Whether CWF marks a diesel-heat-equipped production run versus simply a later serial break is not stated outright by the catalog text - confirm with dealer.

Frequently asked questions

What powers the Cat AS2251 screed?

The AS2251 has no engine of its own. It draws hydraulic power for its extension, crown, and tilt functions, and electrical power for its controls (and for electric-heat versions, the plate heating system), from the paver tractor it is mounted to.

How wide does the AS2251 pave?

Standard paving width is 2.5 m (8'2"). The screed reaches wider widths through bolt-on or hydraulic power-extending mainframe sections, available in front-mount or rear-mount configurations; the exact maximum width depends on which extension package is fitted.

Which Cat paver tractors is the AS2251 compatible with?

The AS2251 was built to mount on Cat's AP-1000B, AP1055B, AP800D, and AP-655C paver tractors, matching those tractors' hydraulic and electrical interfaces.

What AS2251 owners discuss

What's the difference between the diesel-fired and electric heat versions of the AS2251 screed, and does it matter which one you get?

Early AS2251 screeds use a diesel-fired burner to heat the screed plates; later production and factory-updated units run electric heating elements powered off the tractor's onboard generator. Operators report the electric setup heats the plate more evenly and holds temperature better once dialed in, with less risk of hot spots. The diesel burner works fine but rewards an operator who shuts it down promptly at the end of a shift or during extended stops - leaving it lit on an idle screed is the most commonly cited cause of plate warp on this generation of screed. Have your dealer verify the burner shutoff and flame-out sequence on any diesel-heat unit before putting it into regular service.

The extension tubes on our AS2251 feel loose or rattly after several seasons - is this normal wear?

Some play develops over time in the extension slide bushings and mainframe pivot pins as hours accumulate; it is one of the most consistently flagged wear points on hydraulically extendible screeds generally, not something unique to this model. Small amounts of slop at each pivot add up across the width of the screed and start to show as a wavy or inconsistent mat, especially near the extension joint. Check bushing clearance and tow-point pivot movement during routine service rather than waiting for a mat-quality complaint to surface.

What causes a warped or bowed screed plate on the AS2251, and how do owners check for it?

The most frequently cited cause on diesel-heated Cat screeds is a burner left running with no mat under the plate, or one not shut off promptly at the end of a run - the plate heats unevenly and bows or crowns permanently. Owners check for this with a straight edge or string line stretched corner to corner under the plate, using shims to measure gap at several points; a lot of crown showing up corner-to-corner rather than a smooth even curve points to a warped plate rather than a simple adjustment issue. A warped plate cannot be adjusted out through crown or tilt settings - it needs replacement or, if within tolerance, machining flat.

How does crown and tilt control work on the AS2251, and is it easy to dial in a good mat?

Crown is set through adjustment at the screed mainframe and tilt/slope is controlled through the extension cylinders on each side, referenced off tow-point height, the same general layout as other extendible screeds of this era. Getting a consistent mat depends as much on the mechanical condition of the crown-adjustment linkage and depth cranks as on the settings themselves. Worn depth-crank threads are a commonly reported cause of the screed creeping out of a set depth mid-run, so thread condition is worth checking before chasing a mat-thickness complaint through the settings alone.

How much maintenance do the screed vibrator units need, and what's the typical failure pattern?

The vibrator units run in an oil bath rather than on simple grease-and-forget bearings, so the routine service item is checking oil level and condition rather than periodic greasing. Reported failures trace back almost always to oil starvation or contamination: once a bearing runs dry or picks up water or grit, it overheats, the races pit, and the fit against the shaft degrades, which then damages the shaft itself and forces a shaft replacement along with the bearing. Units that stay on top of oil checks report long service life; the ones that fail early are usually the ones with an unnoticed seal leak or a skipped oil check.

Which paver tractors does the AS2251 actually mount to, and can it be run on a tractor it wasn't originally paired with?

Caterpillar paired the AS2251 with the AP-655C, AP-800D, AP-1000B and AP1055B tractors, drawing hydraulic power and, on electric-heat versions, generator power from the host machine. Used-equipment listings confirm AP-655C units sold new with an AS2251 fitted. Owners describe mixing screeds across tractor packages outside the documented pairings, but hydraulic flow, electrical connector pinout and generator capacity all need to match what the screed expects. Have your dealer verify hydraulic and electrical compatibility before assuming a screed from a different tractor package will bolt on and function correctly.

What should I check before buying a used AS2251 screed?

Buyers consistently check the same items on a screed this age: every pivot point for slop, since small amounts at each point add up across the width of the mat; depth-crank threads for wear, which lets the screed creep during operation; extension-tube bushings for play; tow-arm and tow-point wear, since movement there shows up directly in finish quality; and the plate itself, checked with a straight edge or string line for warp rather than just visible damage. Also cycle the lift cylinders - uneven lift from tired seals is a common tell on an older unit. Ask for the screed's service and burner or heating-element history, since burner-shutoff neglect and oil-starved vibrator units are the two failure patterns reported most often. Have your dealer verify hydraulic and electrical compatibility with your tractor before purchase.

Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.

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