Caterpillarasphalt paverasphalt screed

Caterpillar AS2302

Maintenance schedule, common problems & OEM parts breakdown

The Cat AS2302 is a Vers-A-Mat hydraulic screed attachment for asphalt paving, not a self-propelled machine. It has no engine, fuel tank, coolant system, transmission, or final drives of its own — it mounts on and draws hydraulic power from a host paver tractor, specifically the AP1000D or AP1055D track paver. Basic tamper-and-vibrator weight runs about 3084 kg (6800 lb). Standard paving width is 3.05 m (10 ft), hydraulically extendible from 2.44 m (8 ft) minimum to 5.5 m (18 ft) maximum using front-mounted bolt-on extensions in 305 mm (12 in) or 610 mm (24 in) increments. Compaction comes from a tamper bar and vibrator running up to roughly 3000 rpm, and screed heat is electric, split into four zones and powered from the host tractor's generator. Units carry the AYC serial prefix from around 2006 onward and sit in a family alongside the narrower AS2251 and AS2301 Vers-A-Mat screeds.

The AS2302 widened standard paving width to 3.05 m (10 ft) versus the AS2301's 2.5 m (8 ft 2 in) and moved from diesel-fired screed heat to an electric four-zone system, cutting burner upkeep and jobsite emissions. Some later-production units are associated with an AS2302C heat-control revision, though its own documentation is thin and its specs should be treated as unconfirmed pending data-plate verification. Caterpillar has since moved its current screed lineup to SE-series naming, so the AS2302 is a prior-generation attachment rather than an active catalog model. It still shows up regularly in the used market, almost always paired with a used AP1000D or AP1055D tractor, and dealers continue to stock service parts for it. No AS-numbered or otherwise confirmed direct successor model exists in the public record.

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 AS2302 specifications

Engine

Power source	Not self-powered. The AS2302 is a Vers-A-Mat screed with no engine of its own; it mounts on and draws hydraulic and electrical power from its host paver tractor (Cat AP1000D or AP1055D).
Heating power supply	Electric screed heat is fed from a tractor-mounted single-phase generator running at 1,800 rpm.

Weights

Operating weight, basic tamper and vibrator configuration

approx. 3,084 kg (6,800 lb); increases with bolt-on extension packages fitted

Dimensions

Maximum screed width, fully extended	3,310 mm (10.83 ft)
Height	2,300 mm (7.5 ft)
Screed plate length	457 mm (18 in)
Screed plate thickness	13 mm (0.5 in)
Extension packages	Bolt-on, 305 mm or 610 mm (12 in or 24 in); front-mounted, hydraulically driven extenders

Performance

Maximum paving width	5.5 m (18 ft)
Standard paving width	3.05 m (10 ft)
Minimum paving width	2.44 m (8 ft)
Maximum vibrator frequency	3,000 RPM
Crown adjustment	Power (hydraulic) control

Service capacities (summary)

Heating system	Electric, supplied by the tractor generator; no separate fuel tank on the screed
Hydraulic system	Extenders and crown control run off the host tractor's hydraulic circuit; no separate reservoir capacity documented for the screed itself
Engine oil / cooling system	Not applicable; the screed carries no onboard engine

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

AS2302 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable — the AS2302 is a screed, not a self-powered paver. It has no engine of its own.	Not applicable — no engine on this unit.
Cooling system	Not applicable — no engine, no radiator/cooling circuit on the screed itself.	Not applicable.
Fuel tank	Not applicable — no fuel tank on the screed; fuel is carried and metered by the host paver (AP1000D/AP1055D).	Not applicable.
Transmission/powertrain	Not applicable — the screed has no transmission or powertrain compartment.	Not applicable.
Final drives	Not applicable — no final drives on a screed unit.	Not applicable.
Hydraulic system (screed drive circuit)	Not separately documented. The screed's tamper, vibrator, extenders, and crown-adjust functions run on hydraulic power supplied from the host paver's hydraulic tank and pump circuit — there is no standalone screed hydraulic reservoir or fill capacity to publish.	Follow the hydraulic oil spec published for the host paver (AP1000D or AP1055D) supplying the screed, since the screed draws from that shared system rather than carrying its own fluid.
Axles/differentials	Not applicable — a screed has no axles or differentials.	Not applicable.
Grease (screed pivot pins, tow-arm pins, extension slides, bushings)	Spec only — no fill volume; applied by grease gun at scheduled lube points per the OMM.	Cat multipurpose chassis grease (NLGI 2 lithium-complex-type), same general-purpose grease spec used across Cat paver/screed pivot and bushing points. Confirm exact grease points and intervals against the OMM for the specific paver/screed serial range, since lube-point counts and heat-system design vary by screed width/extension configuration.

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

Caterpillar AS2302 maintenance schedule

Service interval	Tasks
Every 10 h	Clean asphalt buildup off screed plates, tamper bar, and vibrator housings before and after each shift. Check screed plate flatness with a stringline and inspect plates for nicks, gouges, or uneven wear. Grease tamper bar and vibrator shaft bearings at every fitting. Inspect crown-adjust cylinder rod and pins for leaks, scoring, or excess play. Check heat-zone wiring and connectors at the screed control box for chafing or looseness. Inspect hydraulic hoses and quick-couplers on the tractor-to-screed circuit for abrasion or seepage.
Every 250 h	Measure screed plate thickness and compare against minimum service limit. Check tamper bar bushings and vibrator bearings for play; regrease per the lube chart. Check extension tube slide and wear-pad clearance on the main screed and bolt-on extensions; shim if excessive. Torque-check crown cylinder mounting pins and screed frame fasteners. Verify temperature uniformity across all four electric heat zones with a surface thermometer.
Every 500 h	Open and inspect the heater control box: relays, current sensors, and connectors, checking for corrosion. Check the tamper bar drive linkage and eccentric shaft for wear. Inspect crown, extension, and leveling cylinder seals for leakage. Inspect strike-off and pre-strike plates for measurable wear; clean or replace as needed. Check the pins and bushings joining the screed frame to the tractor tow point for wear.
Every 1,000 h	Disassemble and measure tamper bar and vibrator shaft bushings/bearings against service limits; replace as needed. Fully inspect extension tube wear pads and slide rails; replace worn pads. Test heat element resistance in each of the four zones and replace elements out of spec. Inspect wiring harness insulation and grounds along the full screed-to-tractor run. Inspect crown-adjust and leveling cylinder rods for scoring; reseal if needed.
Every 2,000 h	Overhaul the tamper bar assembly: shaft, bushings, and drive components as a set. Rebuild vibrator housing bearings and shaft. Check screed frame and extension rails for flatness and twist; straighten or replace bent components. Replace screed plates and strike-off plates at or beyond minimum thickness. Pressure-test hydraulic hoses on the screed circuit and replace any showing age or damage. Recalibrate the heat control ECM and verify all zone sensors against a reference thermometer.
Every 4,000 h	Reseal crown-adjust and leveling cylinders and inspect rods for wear beyond service limits. Replace the full electric heat wiring harness if insulation or connectors show age-related degradation. Replace all extension wear pads and slide-rail bushings as a set. Inspect the screed frame and tow-point structure for cracks or fatigue. Replace tow-point pins and bushings connecting the screed to the host tractor.

Servicing the AS2302 beyond the schedule

Predictive Maintenance & Fluid Analysis

The AS2302 has no engine or reservoir of its own, so predictive work centers on the shared hydraulic circuit and the electric heat system. Sample hydraulic fluid at the host AP1000D/AP1055D reservoir and trend it, since screed cylinders and the tamper/vibrator motor run off that same oil. Track heat-zone amperage and resistance readings at the control box to catch a failing element before it goes cold. Use a handheld thermal camera across all four zones and check tamper bar/vibrator bearings for rising vibration or noise between services.

Corrective & Common Repairs

Typical AS2302 failures trace to wear items, not an engine. Worn tamper bar bushings or vibrator shaft bearings show up as chatter marks or a rough-textured mat. A cold or uneven zone points to a burned-out heat element or a loose connector in the control box. Hydraulic seepage usually starts at the quick-couplers linking the screed to the tractor or at the crown-adjust cylinder seals. Extension tube wear-pad play lets the main and bolt-on sections drift out of alignment, showing up as an uneven paving width.

Overhaul & Rebuild Points

Plan overhaul around the screed's mechanical wear points rather than powertrain hours. Tamper bar shafts, bushings, and vibrator bearings wear fastest and should be pulled and measured against service limits at major intervals. Screed plates, strike-off plates, and extension slide rails need thickness and flatness checks, with replacement once below minimum spec. Crown-adjust and leveling cylinders should get new seals during a rebuild, and the electric heat harness and control box connections deserve a full check since corrosion there causes intermittent zone failures.

Seasonal & Environment Servicing

Electric heat means no diesel burner to winterize, but cold starts still need a longer heat-soak before mix hits the plates — verify all four zones reach temperature before paving in low ambient conditions. For off-season storage, clean and lightly oil bare screed plates and tamper shoes to stop surface rust, grease every fitting, and cap or protect the hydraulic quick-couplers that connect to the tractor. Keep the heater control box dry and covered, since moisture at the relays and connectors is a common no-heat complaint after storage.

AS2302 common service parts

Part number	Part	Notes
9S-8752	Nut-Full	Scheduled service item	Check fitment →

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AS2302 fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
0906-03	Left grade (slope) sensor - voltage above normal / open circuit	Grade sensor connector unplugged or damaged, open wire between sensor and screed control module	Check sensor harness and connector for damage or corrosion, reseat connector, retest before replacing sensor
0907-04	Right grade (slope) sensor - voltage below normal / short to ground	Chafed or pinched harness wire shorting to frame, failed sensor	Inspect harness routing near the screed frame for chafing, test sensor resistance, replace sensor if out of spec
2555/2556-05	Left or right screed extender (slide-out) solenoid - open circuit	Solenoid coil failure or broken wire at the extender solenoid connector	Check coil resistance at the extender solenoid, inspect connector for corrosion, replace solenoid coil if open
2569-06	Screed float solenoid - short circuit to ground	Damaged solenoid coil insulation or pinched wiring at the float valve	Disconnect solenoid and check coil for short to case, repair or replace harness section, replace solenoid if shorted
2570-06	Screed raise solenoid - short circuit to ground	Same failure pattern as the float solenoid circuit - damaged coil or shorted wiring	Check coil resistance to ground, inspect wiring harness for damage, replace solenoid if faulty
2563/2564-02	Screed height adjustment switch - erratic or incorrect signal	Worn or sticking switch contacts, moisture intrusion at the switch housing	Cycle the switch and check for consistent signal on Cat ET, clean or replace switch if contacts are worn
Heat zone indicator - flashing (no published CID)	Screed electric heat zone (left main, right main, left extender, or right extender) has a circuit fault and will not reach setpoint	Blown zone fuse, tripped heat relay, open heating element, or failed temperature sensor in that zone	Check the zone fuse and relay first, then verify element continuity and temperature sensor before replacing the heat control board

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

AS2302 attachments & work tools

Compatible base pavers

AS2302 is a front-mounted screed, not a standalone paver. It installs directly onto D Model asphalt pavers, specifically the AP1000D and AP1055D. It is not sold or operated as its own machine.

Paving width range

Standard paving width is about 3.05 m (10 ft), with a minimum of 2.44 m (8 ft) and a maximum of 5.5 m (18 ft) once extensions are fitted. Actual maximum varies by which extension package is installed.

Hydraulic extenders

Front-mounted extenders are hydraulic-driven, each with its own cylinder controlled through a valve assembly, allowing width changes from the screed console without bolt-on hardware for the base range.

Bolt-on extension packages

Add-on extension inserts are offered in 305 mm (12 in) and 610 mm (24 in) sizes to step the screed beyond its hydraulic extender range. These bolt to the extender ends and are the main way to reach the class's wider paving widths.

Compaction system (tamper/vibrator)

Base configuration is a tamper-and-vibrator (T/V) screed, with vibrator frequency adjustable up to about 3000 rpm. Tamper and vibration settings are tuned from the screed control panel to match mix depth and paving speed; heavier tamper-bar variants exist in the same screed family for higher-density work.

Screed heating

Electric heat system warms the underside of the main screed and the extenders as standard. Optional bolt-on extensions carry their own heater circuits, which need extra heater relays and an ID plug so the paver ECM recognizes the heated extensions are installed.

Crown control

Screed crown adjustment is power-controlled from the operator station rather than manual, letting the operator dial in crown shape without stopping to hand-crank it.

Screed plates

Wear plates on the main screed run about 457 mm (18 in) long and 13 mm (0.5 in) thick; plate wear is a routine service item on this screed family.

Weight class

Basic tamper-and-vibrator configuration weighs roughly 3084 kg (6800 lb), before any bolt-on extensions or extras are added. Add-ons increase this figure incrementally per section fitted.

All AS2302 assemblies by section

Every catalogued assembly group for the Caterpillar AS2302. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Controls

284-0636 Adjuster Gp-Height

10***24	Tube As; (Vertical)	4
10***39	Key-Square	2
10***40	Spacer; (10.74x17.14x7-mm Thk)	2
16***05	Frame As; (Lh)	1

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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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253-4738 Control Gp-Thickness -Lh Thread

1J***36	Pin-Spring; (Spring)	2
25***38	Control Group-Thickness; -Lh Thread	1
25***56	Sleeve As-Adjustment; (Lh Thread)	2
25***62	Rod-Threaded; (1-8-Acme Thd, Lh)	2

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253-4739 Control Gp-Thickness -Counterclockwise Rotation

1J***36	Pin-Spring; (Spring)	2
25***39	Control Group-Thickness; -Counterclockwise Rotation	1
25***63	Rod-Threaded; (1-8-Acme Thd)	2
25***64	Sleeve As-Adjustment; (Rh Thread)	2

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290-1628 Crown Gp-Power

10***39	Key-Square	1
11***50	Sprocket; (12-Teeth)	1
18***45	Boss; (12.7x25.4x15.7-mm Thk)	2
19***83	Bolt-Shoulder; (3/8-16x0.63-In)	1

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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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277-2004 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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197-9850 Shaft Gp-Drive -Front-Non-Actuated

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-Actuated

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***05	Plate	6
12***03	Buffer Group-Sensor; -Material Height-Propel Forward, Reverse-Propel Speed Dial	1
12***75	Tube-Heat Shrink; (7.44-mm Dia)(560-cm)	0
13***89	Clip; (Ladder)	4

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322-9153 Sensor Gp-Temperature

10***05	Plate	6
17***15	Strap; (Dual Clamp)	3
1G***59	Clamp	4
22***81	Film-Warning; -Universal	1

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334-7882 Sensor Gp-Temperature

25***69	Plate Group-Screed	1
25***70	Wiring Group-Screed	1
25***71	Wiring Group-Heater	1
33***82	Sensor Group-Temperature	1

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255-8071 Wiring Gp-Heater

10***01	Kit; (Receptacle) (12-Pin) (Includes Receptacle As & Wedge)	1
10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	4
10***03	Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge)	1
10***13	Receptacle As-Connector; (70-Pin)	1

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255-8070 Wiring Gp-Screed

10***05	Plate	3
14***09	Adapter As	2
14***17	Adapter, -12 Orb / -16 Orfs	1
14***18	Connector As	4

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229-3119 Wiring Gp-Screed -Electric Heat

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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253-4737 Wiring Gp-Screed

10***40	Spacer; (10.74x17.14x7-mm Thk)	4
10***84	Pin As	4
14***13	Adapter Group	1
14***38	Adapter, -6 Orb / Orfs X-Long	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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255-8079 Box Gp-Screed Control

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***06	Box As	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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255-8078 Box Gp-Screed Control

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***06	Box As	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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348-2399 Box Gp-Screed Control

15***60	Kit-Connecting Plug; (3-Pin)(Engine Sensor Wiring Harness)	1
15***62	Wedge-Plug Lock; (4-Pin)	1
15***71	Kit-Connecting Plug; (4-Pin)	1
15***76	Wedge-Plug Lock; (3-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
12***03	Buffer Group-Sensor; -Material Height-Propel Forward, Reverse-Propel Speed Dial	1
13***48	Potentiometer As; (Rh Conveyor Speed Dial)	1
19***99	Panel Group-Electronic; -Material Height-Lh	1

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Frame And Body

250-9997 Arm Gp-Drop

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
13***89	Clip; (Ladder)	4
16***14	Clip	1
25***97	Arm Group-Drop	1

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282-3305 Carriage Gp-Extender

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	3
13***89	Clip; (Ladder)	6
18***35	Pin-Connector; (16-Ga To 18-Ga)	2
25***97	Clamp	4

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253-4726 Frame Gp-Screed

1K***72	Locknut Horn To Guard	2
25***26	Frame Group-Screed	1
25***14	Shoe As-Cutoff; (1-Ft)	2
27***88	Shoe As-Cutoff; (2-Ft)	2

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253-4735 Gate Gp-End

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)	6
16***89	Tack-Fastener	4
18***68	Plate-Serial Number	1

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255-8069 Plate Gp-Screed

25***69

Plate Group-Screed

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255-8133 Plate Gp-Screed

25***33

Plate Group-Screed

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253-4740 Plate Gp-Screed

13***83	Hose As	1
14***18	Connector As	1
14***71	Elbow, 45, -6 Orfs Fm Swivel	1
15***02	Spacer; (11x20x15-mm Thk)	2

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Hydraulic System

263-2817 Cylinder Gp-Hydraulic -Slope

19***47	Valve Group-Control; (Vibratory)	1
19***41	Cartridge As-Valve	1
20***57	Kit-Seal; (Flow Control Valve)	1
20***58	Knob; (Hand)	1

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197-9766 Cylinder Gp-Hydraulic -Slope

06***39	Seal-O-Ring	1
16***21	Kit-Bearing; (Vibratory Motor)	1
19***66	Cylinder Group-Hydraulic; -Slope	1
4D***86	Seal--Bushing To Selector Valve Group	1

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283-6378 Lines Gp-Extender

25***57	Kit-Seal; (Check Valve)	1
25***37	Valve Group-Solenoid; (24-Volt)	2
27***10	Coil-Solenoid	2
28***78	Lines Group-Extender	1

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253-4731 Lines Gp-Slope

00***39	Adapter-Pipe	4
10***95	Bearing	4
10***39	Key-Square	4
10***33	Key-Square; (1/4in X 3/4in Lg)	4

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274-5700 Lines Gp-Slope

13***20	Shaft	2
13***77	Lockout	2
17***69	Kit-Bearing; (Universal Joint)	1
1D***06	Nut 13.89 mm (.546 In.)	4

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253-4736 Lines Gp-Vibratory

16***39	Bolt; (5/8-11x3.5-In)	6
18***25	Scraper; (Brass)	6
19***57	Scraper As	6
1D***18	Nut-Plt-Jam; (5/8unc)	6

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308-2125 Motor Gp-Gear

19***12	Plate	2
1A***75	Bolt; (3/4-16x1.75in)(Fine Thread)	4
1D***06	Nut 13.89 mm (.546 In.)	4
20***59	Pin-Lock	2

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317-3789 Valve Gp-Control -Vibratory

24***16	Actuator Group	4
25***29	Support As; (Lh)	1
25***36	Support As; (Rh)	4
25***41	Plate As; (Lh)	1

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300-0505 Valve Gp-Solenoid

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
12***64	Receptacle As-Connector; (1-Pin)	2
13***89	Clip; (Ladder)	4
18***35	Pin-Connector; (16-Ga To 18-Ga)	1

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332-1453 Valve Gp-Solenoid

18***31	Bolt-Special; (1 1/4-12-2athd)	4
1K***72	Locknut Horn To Guard	4
21***69	Stud	4
25***33	Plate Group-Screed	1

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253-4733 Vibratory Gp

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
12***64	Receptacle As-Connector; (1-Pin)	2
13***89	Clip; (Ladder)	4
18***35	Pin-Connector; (16-Ga To 18-Ga)	2

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Implements

253-4742 Berm Gp

25***42

Berm Group

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253-4741 Berm Gp

25***41

Berm Group

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253-4745 Extension Gp-Screed -Electric Heat, 24-In

25***45

Extension Group-Screed; -Electric Heat, 24-In

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253-4744 Extension Gp-Screed

25***44

Extension Group-Screed

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253-4747 Shoe Gp-Cutoff

25***47

Shoe Group-Cutoff

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Machine Arrangement

251-8303 Screed Ar

16***22	Adjuster Group-Power	1
22***19	Wiring Group-Screed; -Electric Heat	1
25***97	Arm Group-Drop	1
25***03	Screed Ar	1

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Operator Station

253-4734 Platform Gp-Operator

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
12***64	Receptacle As-Connector; (1-Pin)	1
13***89	Clip; (Ladder)	4
18***35	Pin-Connector; (16-Ga To 18-Ga)	2

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Service Equipment And Supplies

253-4732 Plate & Film Gp

25***32

Plate & Film Group

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253-4746 Washdown Gp

25***46

Washdown Group

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AS2302 serial number reference

The serial/PIN tag is riveted to the screed's own main frame, not the paver tractor's PIN plate — check the frame rail near the tow hitch or front cross-member. The first three characters are the prefix, tying the unit to its build series/variant; the digits that follow are the individual unit's sequence number.

Prefix	Identifies	Notes
AYC	AS2302 screed, base series	Front-mounted vibratory/tamper asphalt screed, direct-mount on D-model track pavers (AP1000D, AP1055D), no engine of its own. Dealer inventory records show units from roughly AYC00200 through AYC00230, built circa 2006 through 2014.
TDJ	AS2302C screed	C-series update of the AS2302 screed, front-mounted with electric plate heat, same host-paver mounting. AS2302C is a real, currently-sold configuration, but the TDJ prefix itself never turned up on a dealer listing with a full unit serial number attached — confirm with dealer before relying on it.

Frequently asked questions

What engine does the Cat AS2302 screed have?

None. The AS2302 is a Vers-A-Mat screed attachment with no engine, fuel tank, or coolant system of its own. It mounts on a host paver tractor — the AP1000D or AP1055D — and runs off that tractor's hydraulic system and generator power for screed heat.

What is the operating weight of the AS2302?

Basic weight for the tamper-and-vibrator configuration is about 3084 kg (6800 lb). Actual installed weight varies with which bolt-on extension package (305 mm/12 in or 610 mm/24 in) is fitted.

What replaced the Cat AS2302 screed?

No confirmed direct successor carries the AS2302 name. Caterpillar's current screed lineup uses SE-series naming, so the AS2302 reads as a legacy, prior-generation screed. It remains supported through Cat dealers and still circulates in the used market, typically paired with a used AP1000D or AP1055D paver tractor.

What AS2302 owners discuss

How does the AS2302 electric screed heat system work, and what actually goes wrong with it in the field?

The heat circuit runs off the host tractor's generator through a heater control box mounted on the screed, with a tactile membrane panel, current sensors, and a heater ECM watching separate circuit breakers for the main screed's left/right elements and the extender/extension left/right elements. In practice, uneven heat-up between zones is more often a tripped breaker or a failed current sensor feeding bad data to the ECM than a burned-out element itself. Moisture or corrosion at the connectors behind the control box's lockable cover is a common root cause worth checking before condemning a heat strip. Have your dealer verify any heater ECM or wiring diagnosis before returning the screed to service, since element circuits carry enough current to pose a burn/shock hazard.

What wear pattern shows up on the main screed plates, and why does it matter for mat quality?

The screed plate is the fastest-wearing part of the assembly. Wear concentrated near the front or rear edge of a plate points to a twisted frame or a bad setup rather than simple mileage, and a screed running out of level accelerates that wear while dragging down mat density. The general consensus is to check plate thickness while hot with calipers on a routine basis and to clean the plates at the end of the shift while they're still warm, since hardened asphalt buildup left overnight causes ongoing corrosion damage.

Are there known quirks with the extender and crown-adjust hydraulics on this Vers-A-Mat screed?

The extend circuit is straightforward: control switches energize a solenoid that opens a valve passage, letting auxiliary pump flow reach the extender cylinder while a check valve holds pressure on the return side, and crown position is set through the same power-control scheme. The quirk operators run into is that a thickness-control screw that binds usually points to a worn guide bushing rather than a bad screw, and extender tubes that show scoring or collect dirt and debris will bind or extend unevenly even when the cylinder and valve are healthy. Have your dealer verify hydraulic pressures and bushing clearances before replacing cylinders on a binding extender.

Owners describe the screed plate not holding adjustment, or extensions racking out of level once material is loaded on. What's the general consensus on chasing that down?

Before blaming the plate itself, the standard checks are the pivot points for slop and the depth-crank threads for wear, since either will let the screed move under load even with the plate correctly set. A stringline or straight edge run across the plate front and rear is the standard way to confirm alignment rather than trusting the mechanical adjustment alone. On more than one report, what looked like a bad extension turned out to be a lift cylinder needing reseal. Persistent misalignment despite repeated adjustment attempts is generally a sign of frame or pivot wear, not an operator setup mistake.

What should owners know about tamper bar and vibrator wear on this style of screed?

The tamper bar's job is to tuck material under the plate for precompaction, and stroke needs to be matched to the mix, paving depth, and paving speed. A worn tamper bar edge gives inconsistent precompaction, and operators tend to compensate by running more vibration, which then accelerates plate wear. Screeds with hydraulic stroke adjustment let the operator dial this in from the control panel rather than shimming mechanically, which is the main quality-of-life improvement over older tamper bar designs.

Since the AS2302 has no engine of its own, what should owners understand about relying on the host tractor for power?

Every screed function — heat, extend, crown, and vibration — draws entirely off the AP1000D or AP1055D tractor's generator and hydraulic system, since the screed carries no independent power source. The general troubleshooting order is to check the host tractor's generator output and hydraulic pump condition first when screed functions act up, because a screed that tests fine on its own wiring and valves can still show heat or extend faults that trace back to the tractor-to-screed connection interface, including harness connectors and generator brushes. Have your dealer verify generator output and connector condition at the tractor interface before replacing screed-side components.

What should a buyer check on a used AS2302 before purchase?

Confirm the screed's Vers-A-Mat mounting is actually compatible with the buyer's host tractor (AP1000D or AP1055D), since the two are not interchangeable without the correct hookup. Check main and extension plate thickness against minimum spec with calipers rather than relying on visual condition. Cycle the extenders and crown through their full range watching for binding or scoring in the extender tubes. Power up each heat zone individually to confirm even heat-up and check for tripped breakers or dead zones on the heater control panel. Inspect pivot points and depth-crank threads for slop, and run a stringline across the plate side to side to confirm alignment. Have your dealer verify the heater control panel and ECM for any stored fault indicators before finalizing the purchase.

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

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