Caterpillarasphalt paverasphalt screed

Caterpillar 10-20B

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar 10-20B, marketed as the Extend-A-Mat 10-20B, is a bolt-on, hydraulically extending trailing screed, not a self-propelled paver. It mounts behind Cat AP1000, AP1000B, and AP1000D wheeled paver tractors and AP1055, AP1055B, and AP1055D tracked paver tractors, with period Barber-Greene BG-260-series and BG-2455-series tractors built to the same fit. It carries no engine, weight class, or undercarriage of its own — heating, extension, crown, and vibrator functions all draw off the host tractor's hydraulic and electrical systems. The base frame runs 2.5 m (8 ft) or 3.0 m (10 ft) wide and extends with bolt-on inserts to a maximum that varies by configuration and source, roughly 5.9-7.4 m (19-24 ft). It paves up to 300 mm (12 in) thick and was offered with either diesel-fired torch heating or an electric multi-zone heating system, the electric version reaching 122°C (220°F) plate temperature in under 30 minutes at 4°C (40°F) ambient and above. Serial prefixes documented against this screed and its AP1000D/AP1055D pairing include AGT, BWN, 2KN, 2LN, and 3HL, with 3EL, 3FL, and 2MN reported on single sources and worth confirming with a dealer.

Across its production run the screed itself changed less than the tractors it rides behind: the core differences are heat-system choice — diesel torch versus electric — and how much bolt-on extension length and how many insert sections a given unit carries, plus which era of tractor (Barber-Greene-badged versus D-series Cat) it was built to pair with. Because it attaches through the tractor's leveling arms and tow-point brackets rather than a quick-attach coupler, it is matched to a specific tractor frame rather than freely interchangeable, but that same bolted arrangement means screeds are routinely pulled, rebuilt, or transferred to another tractor independent of the tractor's own service life. That is exactly why the 10-20B still moves in the used and parts market today: screed plates, wear strips, extension bushings, end gate hardware, and heater elements wear out and get replaced on a cycle of their own, and a solid used screed frame is often worth rebuilding and rematching to a working tractor rather than scrapping when the original tractor is retired.

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 10-20B specifications

Engine

Machine type	Extend-A-Mat 10-20B is a bolt-on/extending screed unit mounted behind a Cat or Barber-Greene tracked paver (e.g. AP-1000B, BG-240B). It is not a self-propelled machine and carries no engine of its own.
Heating system	Screed plate heating only, not a drive engine. Diesel-fired option uses four burners (two on main screed, one per extender). Electric option uses multi-zone heating elements, warm-up to 122 degrees C (220 degrees F) in 30 minutes or less at 22 degrees C (40 degrees F) ambient and above. One trade listing describes an LPG-standard heating variant; treat fuel type for the heating burners as varying by configuration/series and confirm against the specific serial-number build.
Emissions tier	Not applicable to the screed itself; emissions certification applies to the host paver's engine, not documented here.

Weights

Screed unit weight	Not published in available factory literature for the 10-20B as a standalone unit. Weight is normally quoted for the paver plus screed combination and varies by carrier model and screed extension configuration.
Combined machine weight	Varies by which paver the screed is paired with (e.g. AP-1000 series, BG-240B); no single figure applies to the 10-20B screed alone.
Ground pressure	Not published for the screed; ground pressure figures apply to the tracked or wheeled paver, not the trailing screed.

Dimensions

Base screed width	2.5 m (8 ft) or 3.0 m (10 ft) base frame, depending on heavy-duty frame selection.
Extended paving width	Sources vary: one factory-style listing gives 2.44 m to 7.37 m (8 ft to 24 ft 2 in) with bolt-on extensions; another gives a basic 2.5 m extending to up to 5.9 m. Treat maximum extended width as varying by configuration/series and number of bolt-on extension inserts fitted.
Transport dimensions	Not documented independently for the screed; transport length/width/height figures are normally published for the complete paver-and-screed combination, not the screed alone.
Ground clearance	Not published for this screed model.

Performance

Paving thickness range	Up to 300 mm, adjustable.
Paving speed	Roughly 0 to 20 m/min reported for the paver-and-screed combination; this is a system-level figure governed by the carrier paver, not an independent screed rating.
Gradeability	Not applicable; the screed is a trailing, non-powered attachment with no independent travel or grade rating.
Vibration system	Hydraulically driven vibrators on the extenders, synchronized in frequency and amplitude with the main screed vibrators.

Service capacities (summary)

Fuel tank	Not documented as a separate capacity for the screed; diesel-fired heating burners draw from the paver's fuel system on most installations.
Hydraulic system	Screed extension, crown, and vibrator functions run off the host paver's hydraulic system; no standalone hydraulic reservoir capacity is published for the 10-20B.
Engine oil	Not applicable; the screed has no engine.
Cooling system	Not applicable; the screed has no engine or independent cooling circuit.

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

10-20B fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable — no onboard engine	N/A. The 10-20B is an Extend-A-Mat screed attachment towed/mounted on a paver tractor (e.g. Cat or Barber-Greene base units). It has no engine of its own; engine oil spec and capacity belong to the tractor, not the screed.
Cooling system	Not applicable — no onboard engine or radiator	N/A. Screed carries no coolant circuit.
Fuel tank (propulsion)	Not applicable — screed is not self-propelled	N/A. Fuel tank and diesel fuel spec belong to the paver tractor.
Screed heater fuel supply (older diesel/torch-fired heat variants only)	Not documented in available sources for this unit — varies by heater configuration; verify against the serial-specific OMM	Where a diesel-fired screed heater is fitted, use the same clean diesel fuel grade specified for the towing tractor's engine. Most 10-20B installations use electric screed-plate heating drawn from the tractor's generator, which needs no separate fuel.
Transmission / powertrain compartment	Not applicable — no drivetrain on the screed	N/A. The screed has no transmission; it is towed and steered by the paver tractor.
Final drives (each)	Not applicable	N/A. No final drives fitted to the screed.
Axles/differentials	Not applicable	N/A. The screed floats on the mat behind the tractor; it carries no axle or differential.
Hydraulic system (screed extension/lift/crown cylinders) and tank	No separate screed reservoir documented in available sources — extension and leveling cylinders are typically supplied from the towing paver tractor's hydraulic tank via hose connections; consult the OMM for the specific tractor pairing	Match the hydraulic fluid used in the host paver's system. Cat's standard recommendation across this era of equipment is Cat HYDO Advanced, with a lighter-viscosity (arctic-grade) HYDO in cold climates and heavier grade in sustained high ambient heat, per Cat's general machine fluid guidance.
Grease (chassis, slide rails, pivots, extension mechanism, auger/tamper bearings) — spec only	No fill volume specified; lubricated by grease-point interval, not by reservoir capacity	NLGI 2 multipurpose chassis grease from Cat's standard grease line (e.g. Cat multipurpose/moly-fortified grease). Cat's general climate guidance calls for a softer NLGI 1 or arctic-grade grease in sustained sub-freezing conditions and standard NLGI 2 for normal ambient ranges; confirm exact grade against the serial-specific lubrication chart in the OMM.

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

Caterpillar 10-20B maintenance schedule

Service interval	Tasks
Every 50 h	Clean extension tubes and slide rails of caked mix and release agent before it grinds into the seals Check end gate wear strip condition and gate alignment against the mat edge Cycle every heater zone and confirm even warm-up; spot-check with an infrared gun on electric units, watch burner flame on diesel units Inspect vibrator hydraulic hoses at the extender linkage for weeping, chafing, or brittle spots Check screed plate thickness and look for feathered or one-sided wear versus even wear Grease extension slide points and pivots per the lubrication chart
Every 250 h	Re-torque bolt-on extension insert hardware and hinge pins Inspect heater harness connectors and junctions for moisture intrusion and corrosion Check crown control linkage or cylinder for play; re-adjust manual crown if fitted Verify extension alignment: parallel run to the main screed, angle of attack, and height offset Inspect diesel burner nozzles and confirm the automatic shutoff timer cuts heat as intended
Every 500 h	Meter each electric heating zone and harness leg for insulation breakdown before a breaker trips Inspect extension tube bushings for play and check tubes for scoring from grit buildup Replace screed plates at or near service limit, or any showing feathered wear Inspect end gate spring tension and false-wall wear strips; replace if scored or bent Check vibrator drive output and confirm frequency/amplitude still tracks the main screed vibrator
Every 1,000 h	Inspect the screed frame and heater boxes for heat-cycle fatigue, cracking, or warping Rebuild or replace worn extension slide bushings and wear pads Service the trailing-edge adjusting system and reset screed plate geometry Load-test the full heater circuit and replace any harness or breaker found borderline at the 500-hour check Inspect hydraulic hoses feeding the extension, vibrator, and crown circuits for age hardening; replace as needed
Every 2,000 h	Have the frame checked for twist or warp from repeated heat cycling, especially around diesel heater boxes Rebuild the extension frame — bushings, slide rails, alignment — back to factory tolerance Replace heater elements or diesel burner assemblies reaching end of service life Recondition the crown control cylinder/linkage and the tow-arm/pull-arm mounting points to the host tractor Have the dealer re-certify the heater circuit or torch assembly for fire/burn risk before returning the screed to production
Every 4,000 h	Pull the screed for a full teardown inspection of frame, extension carriage, and heater assembly at major overhaul Replace all extension bushings, slide rails, and wear strips as a set rather than piecemeal Re-baseline crown, angle of attack, and extension height against factory reference dimensions Repaint and reseal heater box penetrations to slow further heat-cycle fatigue before the next long service run

Servicing the 10-20B beyond the schedule

Predictive Maintenance: Heater Circuit & Zone Checks

The 10-20B has no engine, so there is no oil or coolant to sample — predictive maintenance here means tracking the heater circuit. On diesel-torch units, watch burner nozzle condition and confirm the automatic shutoff timer actually cuts heat; repeated heat and cool cycling fatigues the heater boxes and surrounding frame steel over the years. On electric units, meter each heating zone and harness connector for insulation breakdown before a breaker trips, and run an infrared gun over every zone each shift to catch a cold band the control panel won't show. Watch hydraulic hose condition at the extender linkage too — constant vibration ages those hoses faster than anywhere else on the paving train.

Corrective Repairs: Extension Slides & Vibrator Hydraulics

Most corrective work on this screed traces to the extension frame, since there is no drivetrain to fail. Worn or dirty extension bushings let the extenders walk out of alignment once mix load comes on, so re-check parallel run, angle of attack, and height offset against the main screed at the start of every shift. Extension tube seals fail when caked mix or release agent grinds into them, so daily cleaning of the tubes heads off hydraulic leaks before they start. Vibrator hoses running through the eccentric extender linkage go brittle and weep after a season or two of duty — treat that as routine replacement, not a defect.

Overhaul Points: Frame, Plates & Slide Rebuild

Screed plates are the fastest-wearing part on the 10-20B — budget one to two replacement sets a season depending on mix abrasiveness, swapping near 6 mm (1/4 in) remaining from a 12-16 mm (1/2-5/8 in) new plate. Uneven or feathered wear concentrated at one edge points to a twisted screed frame, not a bad plate batch, and swapping plates without addressing the frame just repeats the wear. At major overhaul, rebuild the extension slide bushings and rails to factory tolerance, reset geometry through the trailing-edge adjusting system, and inspect the heater boxes and surrounding frame for heat-cycle cracking or rot.

Seasonal Servicing: Cold-Weather Heat-Up & Warm-Weather Thermal Expansion

Electric-heat units only hit the 30-minute warm-up to 122°C (220°F) at 4°C (40°F) ambient and above — colder starts take longer, so IR-check every zone before paving begins in cold weather. Diesel-torch units need the burners shut down between passes rather than left idling; unattended idle time is a leading cause of warped plates and heater-box fatigue over repeated seasons. In hot weather, recheck extension alignment and crown settings more often, since frame thermal expansion shows up as the same alignment drift that worn bushings cause.

10-20B fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
No fault code system (no ECU on the screed)	The 10-20B Extend-A-Mat is a bolt-on trailing screed attachment with no engine, no propulsion, and no electronic control module of its own. It cannot generate or display MID/CID/FMI or J1939 SPN/FMI diagnostic codes, which are properties of an engine or machine ECM.	Not applicable - the screed has no controller to fault.	For any electrical or diagnostic code shown in the paver cab, that code belongs to the host tractor (period Cat AP-series paver or Barber-Greene equivalent) engine/machine ECM, not the screed. Diagnose it through the tractor's own service literature or Cat ET on the tractor ECM.
Heater circuit breaker tripped (no numeric code, mechanical breaker)	Screed heat zones are protected by resettable circuit breakers on the heater control panel; a tripped breaker cuts power to one heater bank and shows as a popped-out breaker button, not a coded fault.	Shorted or grounded heating element, moisture intrusion in a heater junction, or an overloaded zone circuit.	Let the breaker cool, reset it, and if it trips again isolate and megger the heater elements/wiring for that zone before reapplying power.
Heat zone indicator lamp off / not cycling	Panel-mounted pilot lamps show which heater zones are energized; a lamp that stays dark or never cycles indicates that zone is not calling for heat.	Failed thermostat/heat control switch, blown lamp, open heater element, or a tripped breaker for that zone.	Check the zone breaker first, then verify element continuity and thermostat operation per the screed's electrical schematic before replacing components.

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

10-20B attachments & work tools

Identification note

The 10-20B is Caterpillar's Extend-A-Mat screed model, not a standalone paver. It is the screed fitted to Cat AP1000/AP1055-class base pavers (and their Barber-Greene BG equivalents), so its "attachments" are screed-side extensions and options rather than a full machine work-tool line.

Hydraulic power-extending frame

Standard paving width is about 3.05 m (10 ft), extending via a triangular hydraulic extender frame to a maximum near 7.37 m (24.16 ft), with a minimum working width around 2.44 m (8 ft). Some equipment listings cite a narrower 2.5-5.9 m span for the same screed, so treat exact min/max as varying by configuration/series.

Bolt-on extension modules

Fixed bolt-on extensions add paving width beyond the hydraulic extender range, seen in the 300 mm (12 in) class on used AP1000B units carrying this screed. Extender height adjusts independently so the bolt-on sections track main-screed elevation.

Screed heating package

Offered as a diesel-fired system with burners on the main screed and one on each extender, controlled by an automatic shutoff timer to prevent overheating, or as an electric heating-element system that brings plates to working temperature in roughly 30 minutes from a cold start. Heating type is a factory/dealer order option, not a field retrofit.

Extender vibratory compaction

Extensions carry their own hydraulically driven vibrators, synchronized in frequency and amplitude with the main screed's vibrators so compaction stays uniform across the full paving width, including when the extenders are deployed.

End gates

Bolt-on, spring-loaded end gates follow the mat profile to hold a clean edge and joint, using a false-wall design with replaceable wear strips sized to match whatever paving width the extenders are set to.

Crown control

Manual crown adjustment is standard equipment; power (hydraulic) crown control is offered as an option for faster crossfall changes between passes.

Screed plate / trailing-edge adjustment

A trailing-edge adjusting system speeds installation of new screed plates and resets of worn plates without disturbing overall screed geometry. This is a maintenance feature built into the screed rather than a bolt-on tool.

Mounting to base paver

The screed attaches through the base paver's leveling (pull) arms and tow-point brackets rather than a quick-attach coupler, and is matched to specific paver frames instead of being interchangeable across unrelated models. Documented base-machine fits include Cat AP1000/AP1000B/AP1000D wheeled pavers with Barber-Greene BG-260/260C/260D equivalents, and Cat AP1055/AP1055B/AP1055D tracked pavers with Barber-Greene BG-2455C/2455D equivalents.

Power source / hydraulic arrangement

The screed carries no engine of its own. Heating, extension, and vibrator functions draw off the host paver's hydraulic and electrical systems, so no separate power pack or add-on hydraulic kit is required beyond the base machine's circuits.

Base-paver factory options (hopper/auger side)

On the AP1000/AP1055-class pavers this screed serves, dealer/factory options include hopper material-level and mix-temperature sensors, revised hopper flashing and rear scrapers to limit spillage, and auger-chamber fume ventilation for the operator platform. These are base-paver options, not screed attachments, but are commonly ordered together with this screed.

All 10-20B assemblies by section

Every catalogued assembly group for the Caterpillar 10-20B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Controls

112-3471 Adjuster Gp-Height -Power

10***39	Key-Square	2
10***10	Wire As	4
10***36	Motor Group-Power Adjuster	2
11***71	Adjuster Group-Height; -Power	1

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102-2703 Adjuster Gp-Height -Manual

10***03	Adjuster Group-Height; -Manual	1
10***47	Gear-Worm	1
10***50	Guide-Bushing	1
11***81	Worm	1

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8i-0257 Adjuster Gp-Height -Manual

10***03	Adjuster Group-Height; -Manual	2
10***04	Bolt-Shoulder	2
10***24	Tube As; (Vertical)	4
10***33	Clevis	2

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8i-0732 Adjuster Gp-Height -Manual

10***01	.. Roller, Bearing	2
10***14	Handle	2
10***39	Key-Square	4
13***77	Lockout	1

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8i-0338 Control Gp-Thickness -Counterclockwise

13***77	Lockout	2
1A***75	Bolt; (3/4-16x1.75in)(Fine Thread)	8
1D***20	Nut,Plain,Hexagon Gear Mtg	2
1D***06	Nut 13.89 mm (.546 In.)	4

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8i-0340 Control Gp-Thickness -Counterclockwise Acme

13***77	Lockout	2
1A***75	Bolt; (3/4-16x1.75in)(Fine Thread)	8
1D***20	Nut,Plain,Hexagon Gear Mtg	2
1D***06	Nut 13.89 mm (.546 In.)	4

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8i-0337 Control Gp-Thickness -Clockwise

13***77	Lockout	2
1A***75	Bolt; (3/4-16x1.75in)(Fine Thread)	8
1D***20	Nut,Plain,Hexagon Gear Mtg	2
1D***06	Nut 13.89 mm (.546 In.)	4

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120-5898 Crown Gp-Manual

00***39	Bearing-Aligning; (Self Aligning)	4
05***09	Bolt-Socket Head	4
10***87	Link-Connecting	1
10***01	.. Roller, Bearing	2

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8i-0734 Crown Gp-Manual

10***14	Handle	1
10***28	Shaft As-Adjustment	1
13***77	Lockout	1
2D***35	Locknut (Visor To Bracket)	1

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112-3472 Crown Gp-Power

10***10	Wire As	2
11***72	Crown Group-Power	1
11***83	Wire As	1
11***84	Wire As	1

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102-2699 Jack Gp-Sloper

10***99	Jack Group-Sloper	1
10***46	Gear-Worm	1
10***49	Guide-Bushing	1
10***64	Bearing-Thrust	2

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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
12***07	Screw-Hex; (10-16x1-In)	6
12***83	Bushing-Bronze	2

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109-7038 Motor Gp-Power Adjuster

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
10***11	Pin-Grooved	1
10***73	Gasket	1
10***74	Limiter-Torque	1

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165-3728 Motor Gp-Power Adjuster

07***77	Bushing-Terminal	2
10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
10***74	Limiter-Torque	1
12***07	Screw-Hex; (10-16x1-In)	6

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109-0336 Motor Gp-Power Adjuster

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
10***11	Pin-Grooved	1
10***73	Gasket	1
10***75	Gear	1

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8i-0730 Sloper Gp-Manual

10***14	Handle	2
13***77	Lockout	2
2D***35	Locknut (Visor To Bracket)	2
5S***49	Bolt; (1/4-20x0.5-In)(1/4-20x.5in)	2

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8i-0214 Sloper Gp-Manual

06***93	Lockwasher-Bearing	2
10***99	Jack Group-Sloper	2
10***00	. Axle, Rod End	2
10***22	Support As; (Lh)	1

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112-3470 Sloper Gp-Power

10***39	Key-Square	2
10***10	Wire As	4
11***70	Sloper Group-Power	1
11***83	Wire As	2

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Electrical And Starting System

111-9078 Wiring Gp-Screed

09***66	Washer; (Hard) (4.5x9x1mm Thk)	2
10***57	Clamp	2
10***63	Bracket As	1
10***64	Bracket As	1

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Electrical System

107-0411 Box Gp-Extension

09***17	Washer	4
10***54	Box-Extension	1
10***29	Plate	1
10***48	Harness As-Screed; (Extender)	1

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118-7933 Box Gp-Extension

08***41	Switch As-Toggle; (Lh Feeder Auto/Manual Control)	1
09***17	Washer	4
10***54	Box-Extension	1
10***48	Harness As-Screed; (Extender)	1

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144-3500 Box Gp-Screed Control -Lh

03***49	Nut-Self Lock; (No.10.Unc)	1
08***41	Switch As-Toggle; (Lh Feeder Auto/Manual Control)	1
10***19	Box; (Lh)	1
10***36	Plate	1

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107-4022 Box Gp-Screed Control -Lh

10***63	Plate; (Lh)	1
10***98	Resistor	1
10***99	Bracket As-Mounting	1
10***19	Box; (Lh)	1

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129-9810 Box Gp-Screed Control -Lh

03***49	Nut-Self Lock; (No.10.Unc)	2
08***41	Switch As-Toggle; (Lh Feeder Auto/Manual Control)	1
10***98	Resistor	1
10***99	Bracket As-Mounting	1

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129-9811 Box Gp-Screed Control -Rh

08***41	Switch As-Toggle; (Lh Feeder Auto/Manual Control)	1
10***14	Plate	1
10***20	Box-Rh	1
11***83	Relay-Time Delay; (Electric Heat)	1

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107-4023 Box Gp-Screed Control -Rh

10***64	Plate; (Rh)	1
10***14	Plate	1
10***82	Timer	1
10***20	Box-Rh	1

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Frame And Body

8i-0342 Arm Gp-Drop

10***68	Nipple-Pipe	2
11***99	Pin As-Pivot	2
3B***52	Elbow; --Cross To Hose Assembly To Air Gauge	2
5P***82	Fitting-Grease; (Hydraulic)	2

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119-7093 Arm Gp-Drop

10***68	Nipple-Pipe	2
11***99	Pin As-Pivot	2
11***93	Arm Group-Drop	1
11***95	Bracket As	2

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8i-0292 Deflector Gp

10***31	Nut-Spring	8
10***84	Screw-Flat Head; (1/2-13x1.5-In)(22.22x7.94x1/2-13 Thd)	8
12***50	Plate	1
12***51	Plate	1

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120-5905 Frame Gp-Screed

10***31	Nut-Spring	6
10***83	Screw-Flat Head; (1/2-13x1-In)	10
11***50	Clamp As; (Bar)	2
12***05	Frame Group-Screed	1

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120-4569 Gate Gp-End

10***19	Locknut; (2-1/4-16-Thd)	2
10***76	Cap	4
10***70	Support As	2
10***47	Washer	2

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145-9438 Gate Gp-End

09***87	Washer-Plated	1
10***19	Locknut; (2-1/4-16-Thd)	2
10***76	Cap	4
10***70	Support As	2

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8i-0177 Plate Gp-Screed -Diesel Heat

13***47	Plate-Main	1
13***48	Plate; (Rh)	1
13***49	Plate; (Lh)	1
5P***76	Washer Guard To Support Assembly And Guard Assembly	74

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Fuel System

112-3465 Burner Gp -Diesel Heat

03***12	Screw-Forming; (10-24x0.5-In)	24
04***65	Screw 19.05 mm(.750 In.) Long	16
10***97	Wheel-Blower	4
10***98	. Roller (With Bushing), Housing-Blower	4

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8i-0658 Lines Gp-Burner -Diesel Heat

00***47	Elbow; (Rh Side)	2
07***84	Clamp	4
2P***79	Locknut- Tube Assembly To Upper Frame	2
2T***05	Elbow	2

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Hydraulic System

135-0217 Cylinder Gp-Hydraulic -Extender

03***39	Ring-Back-Up	1
12***75	Ring-Wear	2
13***17	Cylinder Group-Hydraulic; -Extender	1
13***19	Kit-Seal; (Extender Cylinder)	1

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8i-0692 Cylinder Gp-Hydraulic

03***39	Ring-Back-Up	1
10***50	Seal-Polypak	1
10***51	Seal-Polypak	1
10***52	Seal-Wiper	1

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112-3469 Lines Gp-Extender

10***02	Valve Group-Solenoid; -Extender, Slope	2
11***69	Lines Group-Extender	1
13***17	Cylinder Group-Hydraulic; -Extender	2
14***65	Elbow	2

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112-3467 Lines Gp-Vibratory

07***84	Clamp	6
08***86	Clamp	2
10***84	Hose As	1
11***67	Lines Group-Vibratory	1

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8i-0721 Motor Gp-Gerotor -Vibratory

06***39	Seal-O-Ring	1
16***21	Kit-Bearing; (Vibratory Motor)	1
4D***86	Seal--Bushing To Selector Valve Group	1
7R***57	Seal	1

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138-4308 Valve Gp-Control

13***08	Valve Group-Control	1
15***09	Orifice	1
15***10	Valve; (Sensing)	1
15***11	Valve-Needle	1

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103-3602 Valve Gp-Solenoid

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	2
10***02	Valve Group-Solenoid; -Extender, Slope	1
11***21	Coil	2
13***39	Valve-Block	1

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8i-0143 Vibratory Gp

09***99	Fitting-Grease; (Hydraulic)	3
10***90	Coupling	4
10***95	Bearing	8
10***35	Key-Square; (3/16in X 3/4in Lg)	2

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Implements

106-3483 Extension Ar -Diesel Heat, 28-In

10***52	Harness As-Screed; (Extension)	1
10***83	Extension Ar; -Diesel Heat, 28-In	1
4M***81	Capscrew; (Hex Hd 1/4-20x3/4) (Use W/Spacer 2)	8
6V***85	Nut-Full (1/4-20 Thd); (1/4-20-Thd)(Full)	1

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106-3482 Extension Ar -Diesel Heat, 12-In

10***51	Harness As-Screed; (Extension)	1
10***82	Extension Ar; -Diesel Heat, 12-In	1
4M***81	Capscrew; (Hex Hd 1/4-20x3/4) (Use W/Spacer 2)	5
6V***85	Nut-Full (1/4-20 Thd); (1/4-20-Thd)(Full)	1

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8i-0520 Extension Gp-Screed -Diesel Heat, 12-In

10***19	Locknut; (2-1/4-16-Thd)	2
10***32	Bar-Spacer	1
10***34	Plate	1
10***31	Nut-Spring	2

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8i-0521 Extension Gp-Screed -Diesel Heat With Vibration, 28-In

10***95	Bearing	2
10***12	Shaft As-Vibratory	1
10***19	Locknut; (2-1/4-16-Thd)	2
10***31	Bar-Spacer	1

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104-7655 Plate Gp-Bevel End

10***55	Plate Group-Bevel End	1
12***27	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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104-7653 Plate Gp-Bevel End

10***53	Plate Group-Bevel End	1
12***25	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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145-9418 Plate Gp-Bevel End -2.0-Inch

14***18	Plate Group-Bevel End; -2.0-Inch	1
14***26	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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145-9420 Plate Gp-Bevel End -3.0-Inch

14***20	Plate Group-Bevel End; -3.0-Inch	1
14***28	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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104-7654 Plate Gp-Bevel End

10***54	Plate Group-Bevel End	1
12***26	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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145-9419 Plate Gp-Bevel End -2.5-Inch

14***19	Plate Group-Bevel End; -2.5-Inch	1
14***27	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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104-7656 Plate Gp-Bevel End

10***56	Plate Group-Bevel End	1
12***28	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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145-9417 Plate Gp-Bevel End -1.5-Inch

14***17	Plate Group-Bevel End; -1.5-Inch	1
14***25	Plate As	2
1K***72	Locknut Horn To Guard	8
5P***66	Capscrew; (Hex Hd) (1/2-13 Nc X 1 1/2) (Gd 8 Z)	8

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112-1276 Shaft Gp-Drive -Eccentric Weight

02***87	Fitting-Grease; (Universal Joint)	1
11***76	Shaft Group-Drive; -Eccentric Weight	1
24***28	Seal	1
24***41	Kit-Bearing; (Drive Shaft)	2

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195-4414 Shoe As

19***14	Shoe As	1
8C***78	Stud-Weld; (1/2 X 13 X 1.25in Oal)	4

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104-4482 Shoe Gp-Cutoff

10***82	Shoe Group-Cutoff	1
10***82	Shoe As-Cutoff; (1 Foot)	1
10***88	Shoe As-Cutoff; (2 Foot)	1
1K***72	Locknut Horn To Guard	2

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Machine Arrangement

112-3474 Screed Ar

11***78	Wiring Group-Screed	1
11***65	Burner Group; -Diesel Heat	1
11***67	Lines Group-Vibratory	1
11***69	Lines Group-Extender	1

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Operator Station

118-4339 Platform Gp

11***14	Platform As-Top	1
11***39	Platform Group	1
12***51	Support As-Platform; (Rh Outer)	1
12***52	Support As-Platform; (Lh Outer)	1

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Service Equipment And Supplies

8i-0471 Finish Gp

08***51	Film-Warning; (Lighting Screed Burner)	1
08***54	Film-Notice; (Screed Retract)	2
10***08	Film; (Screed Adjustment)(Extender Screed)	1
10***14	Handle	1

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10-20B serial number reference

The 10-20B is a screed attachment, not a self-propelled machine; it mounts to an AP1000D or AP1055D paver tractor and carries its own serial plate separate from the tractor's own PIN. Check the screed itself, not the paver tractor, when reading the prefix for screed-specific parts (deflectors, screed plates, screed service kit, heating elements). The first three characters are the prefix, identifying the screed's model/production block; the remaining characters are the sequential unit serial number, needed to confirm exact part fitment with a dealer. Exact plate placement on this screed is not documented in available sources; confirm location with your dealer or the screed's operation and maintenance manual. Diesel-heat units use a diesel-fired burner group to heat the screed plates; electric-heat units use resistive heating elements instead, so heating-element kits and burner-group parts are not interchangeable between the two configurations.

Prefix	Identifies	Notes
AGT	10-20B screed, Diesel-heat and Electric-heat configurations, mounted to Cat AP1000D/AP1055D paver tractors	Listed as a current serial prefix for the 10-20B screed in the factory pavers-and-screeds parts reference, in both the standard and extended-life screed maintenance kit tables (deflector, screed plate, screed service, heating element kits). Paired with AP1000D and AP1055D paver tractors only, not the E-series AP1000E/AP1055E (that pairing belongs to a different screed line in the same guide). Diesel-heat and electric-heat configurations share this prefix set. No plant, region, or production-year breakout documented; treat as one production block within the current-support range.
BWN	10-20B screed, Diesel-heat and Electric-heat configurations, mounted to Cat AP1000D/AP1055D paver tractors	Same factory parts-guide grouping as AGT/2KN/2LN/3HL for the 10-20B screed on AP1000D/AP1055D, confirmed in both the standard and extended-life kit tables. No year or plant data documented.
2KN	10-20B screed, Diesel-heat and Electric-heat configurations, mounted to Cat AP1000D/AP1055D paver tractors	Same factory parts-guide grouping as AGT/BWN/2LN/3HL for the 10-20B screed on AP1000D/AP1055D, confirmed in both the standard and extended-life kit tables. No year or plant data documented.
2LN	10-20B screed, Diesel-heat and Electric-heat configurations, mounted to Cat AP1000D/AP1055D paver tractors	Same factory parts-guide grouping as AGT/BWN/2KN/3HL for the 10-20B screed on AP1000D/AP1055D, confirmed in both the standard and extended-life kit tables. No year or plant data documented.
3HL	10-20B screed, Diesel-heat and Electric-heat configurations, mounted to Cat AP1000D/AP1055D paver tractors	Same factory parts-guide grouping as AGT/BWN/2KN/2LN for the 10-20B screed on AP1000D/AP1055D, confirmed in both the standard and extended-life kit tables. No year or plant data documented.
3EL	10-20B asphalt screed (thin, single-source)	Appears only in a standalone parts-book listing bundled with 3FL for the 10-20B screed. Not present in the factory parts reference guide's current prefix grouping (AGT/BWN/2KN/2LN/3HL). Likely an earlier production block predating the guide's current-support range, but not corroborated by a second source. Confirm with dealer before ordering against this prefix.
3FL	10-20B asphalt screed (thin, single-source)	Appears only in the same standalone parts-book listing that bundles it with 3EL. Not present in the factory parts reference guide's current prefix grouping. Confirm with dealer before ordering against this prefix.

Frequently asked questions

What paver does the 10-20B screed mount to?

It mounts behind Cat AP1000, AP1000B, and AP1000D wheeled paver tractors and AP1055, AP1055B, and AP1055D tracked paver tractors, with period Barber-Greene BG-260-series and BG-2455-series tractors built to the same fit. It attaches through the tractor's leveling (pull) arms and tow-point brackets rather than a quick-attach coupler, so it is matched to a specific tractor frame rather than swapped freely across unrelated models.

How wide does the 10-20B pave?

Base frame width is 2.5 m (8 ft) or 3.0 m (10 ft) depending on frame selection. With bolt-on extension inserts fitted, working width grows further — sources vary on the exact ceiling, roughly 5.9 m to 7.4 m (19 ft to 24 ft) depending on configuration and insert count. Paving thickness reaches up to 300 mm (12 in), adjustable.

Is the 10-20B diesel or electric heated?

Both were offered. Diesel-fired torch heating uses burners on the main screed and one on each extender, with an automatic shutoff timer. Electric heating uses multi-zone elements that bring the plates to working temperature — 122°C (220°F) — in under 30 minutes at 4°C (40°F) ambient and above. Heating type is set at the factory or dealer order stage, not a field retrofit.

What 10-20B owners discuss

What's the most common complaint about the 10-20B's extensions holding their alignment?

The recurring theme is that extensions can be set dead-on with the screed empty, then walk out of alignment once mix load comes on the extenders - to the point the screed won't close evenly. One well-documented dispute involved a contractor and Caterpillar disagreeing over whether that behavior was within tolerance or a defect, with Caterpillar holding it met spec. Outside that specific dispute, the accepted field practice is to treat alignment as something to re-check at every start rather than something that holds on its own: verify the extension runs parallel to the main screed, its nose-up angle of attack (roughly 3-6 mm / 1/8-1/4 in), and its height relative to the main plane (rear-mount extensions typically ride a few mm above the main screed, front-mount a few mm below - exact offset varies by configuration). Worn or dirty extension bushings are the most common root cause when alignment won't hold.

Diesel torch or electric heat - what quirks come with each on this screed?

This screed was offered with either a fuel-fired (diesel) torch heating system or an electric band system, and each has its own known failure mode. On the diesel system, operators learn early to shut the burners down rather than let them idle unattended - leaving them lit too long warps the plates, and repeated heat/cool cycles over the years fatigue the screed frame around the heater boxes until it cracks or rots. On the electric system there's no open flame, but individual heating zones can short from moisture intrusion or a loose harness connection without tripping the whole panel, leaving a cold band in the mat while the rest of the screed reads normal - the accepted practice is to check every zone with an infrared gun each shift instead of trusting the control panel alone. Because heater-box fatigue and wiring shorts both carry a burn/fire risk, have your dealer verify the heater frame and heating circuit before putting a suspect unit back into production.

How do the extension vibrators and hydraulics typically behave as they age?

The extenders are hydraulically driven and synchronized in frequency and amplitude to the main screed's vibrator, and the hoses running through that eccentric linkage take constant vibration - going brittle and starting to weep within a couple of paving seasons is considered normal wear, not a defect. The other routine leak point is the extension tube seals: if mix or release agent is left to cake onto the tubes it grinds the seals and starts a hydraulic leak, which is why daily cleaning of the extension tubes is treated as basic upkeep rather than optional.

What wear pattern shows up on the end gate and crown transition?

The end gate bolts on and carries a replaceable wear strip, and the most common damage reported is a bent or gouged gate from the crew retracting the extension faster than the material head can keep up with it. On the crown side, if an extension's crown and elevation don't closely match the main screed's, it shows up as a streak line right at the transition - so the accepted habit is to re-check extension height against the main screed every time the screed is set down on a new reference, not just once at the start of the day.

How fast do screed plates wear, and what pattern means trouble beyond normal wear?

Screed plates are the fastest-wearing part of the whole unit - depending on mix abrasiveness and how hot the heat system runs, expect to replace a set at least once, sometimes twice, a season. New plates run roughly 12-16 mm (1/2-5/8 in) thick and typically get swapped once worn down to around 6 mm (1/4 in). What experienced operators watch for beyond straight thickness is uneven wear concentrated at one edge of a plate, especially a feathered or sharp tail edge - that pattern points to a twisted screed frame, not a bad batch of plates, and swapping plates repeatedly without addressing the frame just repeats the problem.

What should you check before buying a used 10-20B screed?

Run the extensions out and grab the end gate to check for play - wobble there means worn bushings, and scoring or gouging on the extension tubes themselves tells you buildup has already been grinding at those bushings. Check plate thickness and look for the uneven, feathered wear pattern that flags a twisted frame. On a diesel-heated unit, look hard at the heater boxes and the surrounding frame for heat-cycle fatigue, cracking, or rot - years of scorch cycles eventually compromise that steel and it isn't a simple weld-up fix. On an electric unit, meter the heating elements and harnesses and watch for breakers that trip. Most important, start it and run the screed long enough to confirm every section reaches temperature evenly before you buy. Because heater-frame integrity and wiring condition carry both structural and fire risk, have your dealer verify the heater circuit and surrounding frame before the unit goes back into production.

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

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