Caterpillarasphalt paver

Caterpillar AP-300

Maintenance schedule, common problems & OEM parts breakdown

The Cat AP-300 is a compact to mid-size wheel-type asphalt paver built as a triple-axle tractor for urban streets, bike/walking paths, shoulders, and small-to-medium paving jobs. It spans three factory generations on the same general chassis footprint: the base AP300 (Cat 3054C engine, about 52 kW/71 hp, mechanical/earlier-electronic and pre-Tier or Tier 2/Stage II era, produced roughly the mid-2000s into the early 2010s as the direct replacement for the Cat BB 730), the AP300D (about 2013-2016, Cat C4.4 ACERT engine, about 55.5 kW/74.4 hp, Tier 3/Stage IIIA equivalent), and the current AP300F (Cat C3.3B engine, about 55 kW/73.8 hp, configurable from Tier 4 Final/Stage V with DPF and SCR/DEF aftertreatment down to lower-tier equivalents by market). Operating weight runs roughly 6.6-8.2 tonne (14,550-18,078 lb) depending on generation and screed fitted. All three generations pave in the 1.75-4.0 m (5.7-13.1 ft) range using a hydraulic power-extendible screed - the AS3173 on the base AP300 and AP300D, and the electrically heated SE34 V/VT "Command for Screed" system on the AP300F - with travel speed around 16 km/h (10 mph) across the line.

What changed across generations is mainly engine emissions technology and screed control, not the machine's basic layout. The base AP300 ran a simpler mechanical/early-electronic 3054C with no aftertreatment; the AP300D moved to ACERT combustion tuning to hit Tier 3/Stage IIIA without a particulate filter; the AP300F added full Tier 4 Final/Stage V aftertreatment (DPF plus SCR using DEF) along with Eco-Mode automatic engine-speed control and simplified electric-only screed heat with independent zone temperature control. That progression matters in the used and parts market because the three generations are not interchangeable on engine, emissions, or screed-heat components - a buyer or parts counter needs the exact serial prefix and generation before ordering engine, DEF/aftertreatment, or screed-heating parts. The AP300 family's compact size and wheel-type simplicity (versus tracked pavers) keep it in steady demand for municipal, county, and small-contractor fleets, which means a large population of base AP300 and AP300D units remains active in the used market well after AP300F became the current production version.

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 AP-300 specifications

Engine

Engine model (early AP300, pre-2013)	Cat 3054C, 4-cylinder turbocharged diesel
AP300 (3054C) gross power	52 kW (71 hp) at 2200 rpm (SAE J1995)
AP300 (3054C) displacement/cylinders	4.4 L, 4 cylinders, 105 mm bore x 127 mm stroke
Engine model (AP300D, ~2013-2016)	Cat C4.4 ACERT, 4-cylinder
AP300D gross power	55.4-55.5 kW (74-74.4 hp)
AP300D emissions tier	Meets Tier 4 Interim / Stage IIIB for the paving-equipment application of the C4.4 ACERT
Engine model (AP300F, current/2016-on)	Cat C3.3B, 4-cylinder
AP300F gross power	55 kW (73.8 hp)
AP300F displacement	Approximately 3.3 L, 4 cylinders
AP300F emissions tier	Tier 4 Final / Stage V, with diesel oxidation catalyst and diesel particulate filter aftertreatment; engine also offered in lower-regulation configurations for non-regulated markets
Net power	Not separately published for this machine across sources; treat gross power figures above as the documented rating

Weights

AP300 (3054C generation) operating weight	7,300 kg (16,094 lb) as equipped with screed
AP300D operating weight, tractor only	6,300 kg (13,889 lb)
AP300D operating weight, with AS3173 screed	7,400 kg (16,314 lb)
AP300D operating weight, with AS4173 screed	8,100 kg (17,857 lb)
AP300F operating weight, tractor only	6,600 kg (14,550 lb)
AP300F operating weight, with SE34V screed	8,000 kg (17,637 lb)
AP300F operating weight, with SE34VT vibratory screed	8,200 kg (18,078 lb)
Shipping weight	Not separately published; use tractor-only operating weight as the closest documented figure
Ground pressure	Not published for this model

Dimensions

AP300D transport length	Approximately 4.8 m (15.7 ft)
AP300D transport width	1.82-2.0 m (6.0-6.6 ft), varies by source/screed
AP300D transport height	Approximately 2.96 m (9.7 ft)
AP300F transport length	Reported 4.82-5.03 m (15.8-16.5 ft); varies by configuration/source
AP300F transport width	Reported 1.73-1.94 m (5.7-6.4 ft); varies by configuration/source
AP300F transport height	Reported 2.65-2.96 m (8.7-9.7 ft); varies by configuration/source
Standard paving width	1.75 m (5.6 ft)
Maximum paving width (hydraulically extended)	3.42-4.0 m (11.1-13.1 ft) depending on screed fitted
Minimum paving width (reduction option)	0.70 m (27 in), for trench and narrow work
Hopper width (AS4173 screed)	3.2 m (10 ft 6 in)
Wheelbase, track gauge, ground clearance	Not documented in available public spec sheets for this model

Performance

Travel speed	16 km/h (10 mph), consistent across the 3054C, C4.4 and C3.3B generations
Paving speed (AP300F)	Up to 61 m/min (200 ft/min) per dealer and industry spec listings
Paving speed (earlier AP300, general marketing figure)	Up to 85 m/min reported in older brand material; treat as varying by generation/source versus the 61 m/min figure documented for AP300F
Gradeability	Not published for this model

Service capacities (summary)

Fuel tank (AP300F)	110 L (29 gal)
Washdown/spray water tank (AP300F)	28 L (6.2 gal)
Hopper (bunker) capacity	3.8 m3 (134 ft3), consistent across AP300/AP300D/AP300F
Fuel tank (AP300 / AP300D)	Not confirmed from available sources; do not assume it matches the AP300F figure
Hydraulic system, engine oil, cooling system capacities	Not documented in available public spec sheets for any AP300 generation - verify with a dealer or the service manual for the exact serial range

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

AP-300 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter) - Cat C3.3B, four-cylinder	13.2 L (3.5 US gal)	Cat DEO-ULS diesel engine oil, multigrade. SAE 15W-40 for general service; SAE 10W-30 or Cat DEO-ULS SYN 5W-40 in colder climates; Cat DEO Cold Weather 0W-40 for sustained sub-zero starts. Use Caterpillar oil filters.
Cooling system	9 L (2.4 US gal)	Factory-filled with Cat Extended Life Coolant (ELC), a pre-mixed ethylene glycol antifreeze. Cat Diesel Engine Antifreeze/Coolant (DEAC) is an accepted alternate. Premix 50/50 coolant and water on refill; do not mix ELC with other coolant products.
Fuel tank	110 L (29 US gal)	Ultra-low sulfur diesel, 15 ppm sulfur or less. Blends up to 20% biodiesel (FAME) are approved; engines without exhaust aftertreatment can run higher biodiesel blends up to 100%. Up to 100% renewable diesel (HVO) or gas-to-liquid (GTL) fuel is also approved.
Hydraulic system and tank	80 L (17.6 US gal)	Cat HYDO Advanced (SAE 10W) is the standard factory fill, suited to ambient temperatures from -20 C to 40 C (-4 F to 104 F). Cat Bio HYDO Advanced, an EU Ecolabel-certified biodegradable hydraulic oil, is available as an option. Sight gauge and S.O.S sampling port provided.
Washdown spray tank	28 L (6.2 US gal)	Water-based wash solution for the optional wash-down pump and reel; not a lubricated fluid system.
Grease points (chassis and screed pivots) - spec only	Not itemized with a fill volume in Cat literature	General-purpose Cat Advanced 3Moly or 4Moly grease, NLGI 2, for the normal -20 C to 40 C (-4 F to 104 F) range; Cat Arctic Platinum grease for sustained sub-zero cold. No separate propel-gearbox or final-drive oil capacity is published for this model - the wheel-drive hydrostatic motor and its servo-assisted gearbox draw off the main hydraulic system rather than carrying their own sump.

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

Caterpillar AP-300 maintenance schedule

Service interval	Tasks
Every 10 h	Clean asphalt buildup from the hopper, augers, screed plates, and conveyor tunnels after every shift before it hardens. Check engine oil level, coolant level, and fuel-water separator before startup each day. Inspect auger and conveyor drive chains for tension, slack, and visible wear weekly. Grease screed extension slide rails, auger bearings, and conveyor bearing points weekly. Check tire condition, inflation, and wheel lug torque weekly on the wheeled tractor. Test screed heat (burner or electric elements) and confirm even plate temperature before each paving run.
Every 250 h	Change engine oil and filter (3054C, C4.4 ACERT, or C3.3B per series) or confirm interval against an S.O.S sample. Replace primary fuel filter and drain water/sediment from the fuel tank. Check hydraulic oil level and inspect hoses, fittings, and cylinder rods for leaks. Adjust auger and conveyor chain tension and check sprockets for wear. Grease screed vibrator/tamper bar bearings and check for play. Inspect wheel bearings and steering linkage for looseness.
Every 500 h	Replace hydraulic return filter element. Check coolant condition and pull a coolant sample for level 1 analysis. Grease all propel and steering pivot points on the tractor frame. Inspect screed moldboard and extension wear plates, replace if scored or thinned. Check DEF tank, lines, and dosing components for leaks or fault codes on Tier 4 Final/Stage V AP300F units. Inspect air intake piping and turbocharger mounting for leaks or looseness.
Every 1,000 h	Change hydraulic tank oil or extend per S.O.S results (HYDO Advanced supports longer intervals with monitoring). Replace secondary fuel filter and inspect primary air filter element, replace if restricted. Check auger and conveyor gearbox oil level and condition, top up or change as needed. Inspect auger and conveyor drive sprockets and idlers for wear, replace worn sets. Check engine mounts, drive belts, and injector performance. Torque-check screed main frame, pull-arm, and hitch fasteners.
Every 2,000 h	Change engine coolant if running conventional coolant, or sample extended-life coolant (ELC) for continued use. Replace hydraulic tank breather and inspect suction strainer/screen. Inspect propel wheel motors and drive components for internal wear or leakage. Check diesel particulate filter condition and regeneration performance on C3.3B Tier 4 Final/Stage V units. Inspect and service screed heating elements, thermocouples, and control wiring. Clean and repack wheel bearings across the tractor undercarriage.
Every 4,000 h	Perform engine valve lash inspection and adjustment per the applicable engine series (3054C, C4.4 ACERT, or C3.3B). Inspect turbocharger for shaft play and replace if worn. Rebuild or replace worn auger and conveyor gearboxes. Inspect hydraulic pump and main control valve for internal wear and leakage.
Every 6,000 h	Replace extended-life coolant (ELC) at 6000 hours or 6 years, whichever comes first. Service diesel particulate filter ash buildup on Tier 4 Final/Stage V C3.3B units. Inspect and rebuild screed extension hydraulic cylinders. Evaluate engine for major overhaul (injectors, liners, bearings) based on hour meter and oil analysis trends.

Servicing the AP-300 beyond the schedule

Predictive Maintenance & Fluid Analysis

Run S.O.S sampling on engine oil, hydraulic oil, and coolant to catch wear metals early - these small-displacement engines (3054C, C4.4 ACERT, or C3.3B) work a high-vibration, dust-heavy paving duty cycle that ages oil faster than the hour meter suggests. On AP300F Tier 4 Final/Stage V units, track DEF quality and DPF soot-loading trends to catch aftertreatment problems before a derate. Sample auger and conveyor gearbox oil too - abrasive asphalt fines are the main contaminant path into those drives.

Corrective & Common Repairs

Recurring failure points on the AP300 line: auger and conveyor chain stretch and sprocket wear from abrasive mix fines, screed heating-element and thermocouple failures, hopper wing-cylinder seal leaks, tamper bar and vibrator bearing wear, and fuel-water separators clogged by field-sourced fuel. AP300F Tier 4 Final units add DEF dosing-valve and NOx-sensor faults to the list. Wheel bearings see steady wear from constant slow-speed, high-torque propel against loaded material.

Overhaul & Rebuild Points

Major wear items at overhaul are the auger and conveyor gearboxes, screed extension slide rails and wear plates, propel wheel motors, and the hydraulic pump/valve bank. Engine rebuild scope depends heavily on generation - the mechanical 3054C is a straightforward in-frame rebuild, while the C4.4 ACERT and especially the C3.3B (with DPF/SCR aftertreatment) require electronic diagnostics and emissions-system work as part of any major engine overhaul.

Seasonal & Environment Servicing

Before paving season, flush and test the screed heating system (burner ignition on AS3173, electric elements and thermocouples on SE34) and confirm even mat temperature across zones. Check coolant freeze protection ahead of cold weather and let the engine reach full operating temperature before propel in cold starts. On AP300F units stored over winter, verify DEF hasn't degraded or frozen. Hot, dusty summer paving demands more frequent air filter and fuel-water separator service.

AP-300 common service parts

Part number	Part	Notes
252-6338	Filter Element-Wtr Sep & Fuel	Fuel system service	Check fitment →
1R-1804	Filter Element-Wtr Sep & Fuel	Fuel system service	Check fitment →
207-2757	Seal	Fuel system service	Check fitment →
294-2519	Filter Element-Air	Air intake service	Check fitment →
294-2520	Filter Element-Air	Air intake service	Check fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

AP-300 fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
CID 0110 FMI 03	Engine coolant temperature sensor circuit reading above normal (open circuit or short to supply)	Damaged coolant temp sensor, corroded connector, or open wiring between sensor and ECM	Check connector and wiring for damage/corrosion, test sensor resistance against spec, replace sensor if out of range
CID 0110 FMI 00 (Event E360/E361)	Engine coolant temperature above normal operating range, triggers warning then automatic power derate/shutdown	Low coolant level, blocked or dirty radiator core, failed fan drive, or thermostat stuck closed	Shut down safely, check coolant level and radiator for debris, verify fan operation before restart
CID 0100 FMI 03/04	Engine oil pressure sensor circuit voltage above or below normal range	Faulty oil pressure sensor, pinched or corroded sensor wiring, bad ground	Inspect sensor wiring and connector, test sensor output, replace sensor if reading stays out of range with known-good wiring
CID 0168 FMI 02	System (battery) voltage erratic, intermittent, or incorrect	Loose or corroded battery terminals, failing alternator/charging system, chafed main harness wiring	Check battery terminals and ground straps, load-test battery and charging system, inspect main harness for chafe points
CID 0247 FMI 09	J1939 data link abnormal update rate between engine ECM and machine display/control modules	Damaged or poorly terminated CAN data link wiring, loose connector at display or ECM, module power/ground fault	Inspect data link wiring and connectors for damage, verify termination resistors, check module grounds before swapping components
SPN 1569 FMI 31	Aftertreatment/SCR inducement condition active, engine performance derated to protect emissions system	Low or contaminated DEF, DEF quality/level sensor fault, or an unresolved upstream aftertreatment fault left active too long	Check DEF level and quality first, clear the root aftertreatment fault, then run the ECM reset/regeneration procedure with Cat ET
SPN 3251 FMI 10	Diesel particulate filter differential pressure signal erratic, intermittent, or incorrect	Plugged or damaged DPF pressure sensing tubes, failed differential pressure sensor, high soot load preventing normal readings	Inspect and clear pressure tubing for soot/blockage, test the differential pressure sensor, perform a stationary forced regeneration if soot load is high

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

AP-300 attachments & work tools

Primary screed

AP-300 pairs with the AS3173 hydraulic power-extendible screed, standard paving range 1.75-3.2 m (5'9"-11'2") and maximum extended width 4.0 m (13'1"). Later F-series machines run electrically heated SE34 Series screeds in vibration-only or vibration/tamper-bar builds; earlier D and base units offer the AS3173 in LPG or electric heat.

Screed extensions

Heavy-duty 2.5 m (8 ft) and 3.0 m (10 ft) screed frames accept bolt-on extension sections to reach the machine's extra-wide paving widths. Extensions are mechanically bolted, not a quick-coupler system.

Paving-width reduction kit

An optional narrowing attachment drops paving width down to about 0.7 m (27.5 in) for trench work, narrow shoulders, and other confined-space paving.

Tamper bar / vibration system

Screed compaction is variable-frequency vibration, with an optional tamper bar for added precompaction; tamper bar and augers can be run in a slow-speed cleanout/warm-up mode before paving starts.

Screed heating system

Screed plates heat via LPG or electric elements depending on generation and market; F-series machines standardize on electric heating for the SE34 screeds. Heating arrangement is tied to the specific screed ordered, not field-interchangeable without the matching kit.

Auger and feed system

Feeding conveyors deliver mix to an auger assembly with two independently adjustable push rollers; auger height is adjustable and the augers raise automatically with the screed for transport. Auto-fill feeder logic and single-touch activation control the augers and conveyors together, and feed sensors set fill level.

Front wheel assist

An optional hydrostatic front wheel assist system powers two front bogie wheels in addition to the rear propel drive, adding rimpull and traction on grade or soft base.

Operator canopy

Two factory canopy options are offered: a manually folding canopy or a hydraulically folding canopy, both full-width with side-extending wings for operator coverage.

Engine / emissions configuration

Configuration varies by generation: the original AP300 (approx. 2008-2014) ran a Cat 3054C rated about 52 kW (71 hp) meeting Stage II-equivalent emissions, while the current AP300F runs a Cat C3.3B rated about 55 kW (73.8 hp) offered in Tier 4 Final/Stage V or lower-emissions variants for non-regulated markets. Confirm engine family against the machine's actual serial/generation before ordering engine-side parts.

Mounting / coupler notes

The screed attaches to the tractor via the paver's integrated tow-point/hitch arrangement rather than an aftermarket quick-coupler; screed model, heating type, and hydraulic hookups must match the specific paver generation and are not universally interchangeable across AP300/AP300D/AP300F builds.

All AP-300 assemblies by section

Every catalogued assembly group for the Caterpillar AP-300. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Air Inlet And Exhaust System

230-7581 Connection Gp-Inlet

12***78	Locknut; (M6x1-Thd)	1
13***40	Locknut; (M8x1.25-Thd)	2
13***89	Clip; (Ladder)	1
1P***86	Adapter	1

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237-5408 Manifold Gp-Exhaust

11***79	Gasket	3
11***62	Plate	3
23***08	Manifold Group-Exhaust	1
23***88	Gasket-Inlet	1

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234-1421 Mounting Gp-Exhaust

23***21	Mounting Group-Exhaust; -Turbo Exhaust	1
31***98	Muffler Group	1
6B***71	Clamp	1
6I***39	Gasket; (Exhaust)	1

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Basic Engine

299-2148 Camshaft Gp

06***95	Rod	8
13***53	Tappet	8
1B***36	Key-Woodruff	1
29***48	Camshaft Group, Set Of Main Bearing-.25, Set Of Main Bearing-.25; (- 0.254) (- 0.250), Set Of Main Bearing-.25; (-0.254) (-0.250)	1

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247-4923 Cover Gp-Engine

10***30	Bolt; (M10x1.5x20-mm)	1
11***22	Bolt; (M8x16-mm)	5
20***02	Cover As; (Power Take-Off)	1
20***03	Seal-Cover	1

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267-9420 Cover Gp-Valve Mechanism

10***38	Bolt; (M6x20-mm)	2
10***41	Bolt; (M6x1x10-mm)	2
11***04	Seal-O-Ring	1
13***88	Cap-Oil Filler; (Engine)	1

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247-4821 Crankshaft Gp

03***68	Bolt; (5/8-18x3.75-In)	10
06***02	Dowel	10
06***06	Plug	1
06***43	Plug-Side-(1.251 Dia.)	1

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232-7400 Crankshaft Gp

03***90	Washer-Thrust; (Standard-Upper)(Upper)	2
03***91	Washer-Thrust; (Standard-Lower)(Lower)	2
06***73	Washer-Thrush (Upper) .18mm (.007in)	0
06***74	Washer-Thrust; (0.18-mm Os)(Lower)	0

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359-0715 Crankshaft Gp

20***19	Bolt; (M8x1.25x16-mm)	10
23***49	Housing As	1
23***04	Cylinder Block Group	1
35***15	Crankshaft Group	1

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247-4820 Cylinder Block Gp

22***01	Bolt; (M15x1.5x137-mm)	7
22***02	Bolt; (M15x1.5x162-mm)	3
24***20	Cylinder Block Group	1
24***68	Cylinder Head Group	1

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232-7604 Cylinder Block Gp

06***06	Plug	4
14***79	Retainer-Valve Spring	16
18***82	Guide-Valve	8
19***51	Seal-O-Ring	1

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247-4873 Cylinder Head Gp

11***59	Bolt; (M10x1.5x35-mm)	4
13***80	Pulley-Fan Drive	1
23***65	Spring Extension, Housing As	1
24***73	Cylinder Head Group	1

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247-4868 Cylinder Head Gp

24***68	Cylinder Head Group	1
3K***60	Seal Pilot Manifold On; Seal To Boom Check Valve Drain	1
6V***38	Valve-Shutoff; (Engine Oil Pan Drain)	1

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271-7079 Drive Gp-Fan

03***87	Ring-Starting Motor; (126-Teeth)	1
0S***03	Bolt,Machine Fuel Pump Drive Gear Mounting	6
16***89	Flywheel As	1
27***79	Drive Group-Fan	1

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230-7286 Flywheel Gp

10***57	Plate	1
12***83	Bolt; (M10x1.5x30-mm)	6
14***76	Housing-Flywheel	1
19***08	Plug	1

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223-7825 Housing Gp-Flywheel

06***79	Dowel	1
10***51	Bolt; (M8x1.25x65-mm)	5
10***30	Bolt; (M10x1.5x20-mm)	1
12***15	Bolt; (M8x16x1.25-mm)	9

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243-3272 Housing Gp-Front

06***79	Dowel	1
10***51	Bolt; (M8x1.25x65-mm)	5
10***30	Bolt; (M10x1.5x20-mm)	1
12***15	Bolt; (M8x16x1.25-mm)	9

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232-3713 Lifting Gp-Engine

18***43	Stud	4
23***13	Lifting Group-Engine	1
6H***16	Plug-Protective	10

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232-6206 Mounting Gp-Engine

23***06	Mounting Group-Engine	1
28***90	Washer; (51x100x8-mm Thk)	3
28***95	Support As; (Engine)	1
28***82	Support As; (Engine)	1

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230-8278 Pan Gp-Oil

06***13	Gasket	1
10***71	Bolt	6
12***72	Bolt	1
22***05	Gasket	1

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247-4831 Piston & Rod Gp

12***36	Ring-Retaining	2
22***38	Bushing	1
22***39	Bolt-Special; (Connecting Rod)	2
22***41	Rod As-Connecting; (Length L)	4

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277-6295 Plug Gp-Engine

27***95	Plug Group-Engine	1
6I***01	Block	1
6I***02	Pulley	1
7W***34	Bolt; (7/16-20x1.5-In)	3

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225-4317 Plug Gp-Engine

22***17	Plug Group-Engine	1
29***84	Plug; (Blanking)	4

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360-7351 Pulley Gp-Crankshaft

36***51	Pulley Group-Crankshaft	1
7W***26	Filter As-Engine Oil	1

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230-7353 Pulley Gp-Crankshaft

06***95	Rod	8
13***53	Tappet	8
18***46	Screw	2
22***25	Lever As	4

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247-4876 Valve Mechanism Gp

24***76	Valve Mechanism Group	1
5D***26	Clamp-Band; (9/16 To 1 1/16)	1
5P***43	Hose 34 cm (13.39 In.)	0

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Cooling System

231-0033 Connection Gp-Water

10***95	Bolt; (M8x1.25x35-mm)	4
22***17	Cooler-Oil; (Engine)	1
22***18	Seal	2
23***33	Connection Group-Water	1

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354-1274 Cooler Gp-Engine Oil

22***41	Plug	1
22***44	Gasket; (Engine Oil Filter Base)	2
23***51	Plate; (Blanking)	1
24***74	Head As-Oil Filter; (Engine)	1

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323-6679 Cooler Gp-Fltr Base & Eng Oil

10***16	Fan; (10-Blade)	1
11***49	Nut; (M12-1.75x93-mm-Thd)	4
12***14	Extension-Fan	1
12***08	Spider As-Fan	1

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277-2972 Fan Gp-Suction

10***51	Bolt; (M8x1.25x65-mm)	5
11***29	Bolt; (M8x1.25x75-mm)	2
22***38	Seal-O-Ring	1
22***39	Seal-O-Ring	1

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230-7355 Pump Gp-Water

23***55

Pump Group-Water

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Valve Group-Fluid Sampling

16***90	Valve As-Fluid Sampling; (Coolant)	1
3J***54	Packing,Preformed Part Of Kit P/N 5r***27	1
8C***45	Cap-Dust; (Engine Oil Quick Disconnect)	1
8C***46	Valve-Fluid Sampling; (Transmission Oil)	1

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Electrical And Starting System

Alternator Group-Charging

06***66	Washer	1
10***51	Bolt; (M8x1.25x130-mm)	1
11***49	Nut; (M12-1.75x93-mm-Thd)	1
14***83	Bolt; (M10x1.5x45-mm)(Starter Motor)	2

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271-7077 Alternator Gp-Charging

15***75	Connector	2
25***34	Filter Group-Water Sep & Fuel	1
27***77	Alternator Group-Charging	1
31***93	Plate	1

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Sender Group

18***21	Gauge Group-Coolant Temperature	1
19***51	Seal-O-Ring	1
23***57	Switch-Water Temperature; (Engine Coolant)	1

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236-8758 Sender Gp-Temperature

23***58	Sender Group-Temperature; -Engine Coolant	1
25***38	Filter Element-Wtr Sep & Fuel	1

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Starting Motor Group

31***39	Starting Motor Group-Electric	1
6I***64	Stud; (M10x1.5x30-mm)	3
6I***94	Nut; (M10x1.15-Thd)	3

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323-6678 Starting Motor Gp-Electric

13***89	Clip; (Ladder)	2
31***27	Tube As	1
31***92	Filter Group-Fuel	1
32***78	Starting Motor Group-Electric	1

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Switch Group

19***67	Seal-O-Ring	1
23***61	Plug; (Blanking)	1
25***10	Switch As-Pressure; (Engine Oil)	1

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303-2131 Switch Gp-Pressure

12***78	Locknut; (M6x1-Thd)	4
29***12	Pin	1
30***31	Switch Group-Pressure	1
31***21	Plate	1

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Engine Arrangement

321-8229 Engine Ar-Primary

22***25	Housing Group-Flywheel	1
22***17	Plug Group-Engine	1
23***86	Flywheel Group	1
23***53	Pulley Group-Crankshaft	1

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285-7966 Installation Ar-Engine

20***79	Valve Group-Fluid Sampling; -Engine Oil	1
28***66	Installation Ar-Engine	1
29***89	Radiator Group	1
29***92	Mounting Group-Engine	1

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Fuel System

260-3128 Filter & Lines Gp-Fuel

17***38	Bolt	1
22***36	Gasket; (Exhaust Manifold)	1
25***12	Manifold-Exhaust	1
26***28	Filter & Lines Group-Fuel	1

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Filter Group-Fuel

1R***04	Filter Element-Wtr Sep & Fuel	1
20***57	Seal; (Fuel Filter)	1
22***14	Bowl As	1
22***17	Drain As; (Water Separator)	1

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243-4334 Filter Gp-Fuel

24***34	Filter Group-Fuel	1
6I***63	Nut; (M10x1.15-Thd)	3
6I***12	Stud	3

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252-6334 Filter Gp-Water Sep & Fuel

25***34	Filter Group-Water Sep & Fuel	1
31***17	Adapter As-Exhaust	1
31***18	Muffler	1
31***19	Tube-Exhaust	1

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Pump Group-Fuel Injection

10***30	Bolt; (M10x1.5x20-mm)	1
12***15	Bolt; (M8x16x1.25-mm)	1
14***14	Clip	1
14***18	Washer	1

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285-8528 Pump Gp-Fuel Injection

03***49	Plug	2
06***68	Nut-Fuel Line; (1/2-In)	2
22***78	Fitting-Compression	2
24***59	Washer-Sealing; (13.25x18.45x1.6-mm Thk)	2

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299-9265 Pump Gp-Fuel Prm & Prim Filter

12***72	Bolt	2
21***08	Fitting; (Quick Disconnect, Male)	1
21***09	Fitting; (Quick Disconnect, Female)	1
23***58	Washer; (6.51x17.785x1.6-mm Thk)	2

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Hydraulic System

Drive Group

0T***24	Bolt 9.525 mm(.375 In.) Dia. N. C.	8
32***71	Drive Group-Pump	1
32***86	Hub-Coupling	1
32***87	Flange	1

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Lubrication System

232-7378 Filter Gp-Engine Oil

10***61	Bolt; (M10x1.50x50-mm)	5
22***29	Pump As-Engine Oil	1
23***78	Filter Group-Engine Oil	1

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230-7578 Pump Gp-Engine Oil

23***78	Pump Group-Engine Oil	1
25***67	Regulator Group-Temperature; (Includes Connector)(Water)	1
25***70	Seal-O-Ring; (Water Temperature Regulator)	1
6I***60	Bolt; (M8x1.25x25-mm)	2

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Machine Arrangement

283-6955 Common Ar

28***55	Common Ar	1
28***66	Installation Ar-Engine	1

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AP-300 serial number reference

The PIN plate sits at the back of the paver, below the steps to the operator station. It shows the model number and the Product Identification Number; the serial number is the last eight characters of that PIN, and the first three characters of the serial number are the prefix that identifies the specific model and generation.

Prefix	Identifies	Notes
B2Y	AP300 (early / mechanical-screed generation)	Serial range begins at B2Y00001. Machine is powered by a 3054C engine. Shares feeder, auger and bearing kit part numbers with the AP300D (prefix TEN), indicating the same platform generation.
TEN	AP300D	Serial range begins at TEN00001, powered by a C4.4 engine. Paired with the B2Y-prefix AP300 in feeder, auger and bearing service kit tables, same generation platform under the D suffix.
7P8	AP300 (mechanical, pre F-series generation)	Grouped with 7P9 and 7PF for feeder, auger, flashing and grade-control kits, distinct from the AP300F prefix set. Appears independently on aftermarket electrical parts listings tied to this prefix.
7P9	AP300 (mechanical, pre F-series generation)	Same generation group as 7P8 and 7PF. Documented in parts-catalog literature covering the 7P91-and-up serial range.
7PF	AP300 (mechanical, pre F-series generation)	Same generation group as 7P8 and 7P9 across feeder, auger and grade-control kit tables. Confirm with dealer -- found only in Caterpillar's own parts catalog data.
FRA, NNN, WHY, YES	AP300F (F-series / Command for Screed generation)	Confirmed prefix set for the F-series update of the AP300 across feeder, auger, flashing, grade-sensor, beam and preventative-maintenance kit tables. Corroborated by an independent parts-compatibility listing separate from the primary catalog source.

Frequently asked questions

What engine does the Cat AP-300 asphalt paver use?

It depends on the generation. The base AP300 runs a Cat 3054C rated about 52 kW (71 hp). The AP300D (roughly 2013-2016) runs a Cat C4.4 ACERT rated about 55.5 kW (74.4 hp). The current AP300F runs a Cat C3.3B rated about 55 kW (73.8 hp), offered in configurations from Tier 4 Final/Stage V (with DPF and SCR/DEF aftertreatment) down to lower-tier equivalents depending on the market.

What is the operating weight of the Cat AP-300?

Operating weight varies by generation and screed. The current AP300F runs about 6.6 tonne (14,550 lb) tractor-only, about 8.0 tonne (17,637 lb) with the SE34 V screed, and about 8.2 tonne (18,078 lb) with the SE34 VT screed. The AP300D is documented around 7.4 tonne (16,314 lb). Confirm the exact figure against the screed and options fitted to a specific unit.

What replaced the Cat AP-300?

Within its own line, the base AP300 (Cat 3054C) was succeeded by the AP300D (Cat C4.4 ACERT) around 2013, which was in turn succeeded by the current AP300F (Cat C3.3B) around 2016. The AP300F remains in production with no announced successor. The original AP300 itself was launched as the direct replacement for the older Cat BB 730 paver.

What AP-300 owners discuss

What do operators say about the AP-300's propel and hydraulic behavior, and what usually causes it to act up?

On wheel-type AP300 units, propel is hydrostatic, driving the rear wheels with front-wheel assist offered as an option for soft or uneven base material. Sluggish or uneven travel speed traces most often to low hydraulic fluid, a partially clogged intake screen, or dust pulled into the tank through a leaking cylinder rod seal rather than a pump fault outright. Contaminated fluid also shows up as erratic auger and conveyor feed response since those circuits share the same hydraulic system. Stay on the seasonal fluid and filter interval and flush before the oil varnishes. Any teardown of the propel pump or motor circuit should go through a dealer to confirm root cause before parts get swapped on a guess.

What undercarriage or wear patterns are typical for the wheel-type AP-300?

The front bogie wheel set and the rear drive tires are the main undercarriage wear items on wheel-configuration AP300 machines. The rear tires, being solid rubber, wear faster than the front bogies since they carry propulsion and steering load. Watch the bogie wheel mounts for play — a bent shaft from curb strikes or hard turning under load shows up as vibration or uneven wheel contact against the mat. Check wheel hardware torque and steering linkage response on routine walk-arounds; loose hardware in this area is one of the more common comebacks reported on these machines, along with front-wheel-assist drive components on units so equipped.

How do engine quirks differ across the AP300, AP300D, and AP300F generations?

The base AP300 (3054C engine) is mechanically simpler with no diesel particulate filter, and complaints are mostly routine fuel-system service items rather than anything chronic. AP300D moved to the C4.4 ACERT with a DPF-based aftertreatment; regen trouble traces mostly to short-cycle jobsite duty (frequent idle or low-load stretches) that never lets passive regen finish, plus soot-loading faults when exhaust temperature sensors or harness connectors degrade — a heat-damaged or corroded harness pin is a repeat culprit for erratic aftertreatment readings. AP300F runs the C3.3B, adding SCR/DEF dosing alongside the DPF for Tier 4 Final/Stage V compliance, so DEF quality and freeze precautions plus dosing-system health join the checklist. Treat any persistent regen or DEF fault code as worth a proper diagnostic pull rather than assuming it's just a plugged filter.

What electrical or sensor issues come up most often on these pavers?

The feed sensor near the auger or conveyor (ultrasonic or ceramic-faced, used to auto-regulate material flow) is the most commonly reported nuisance — hot asphalt residue coats the sensor face and throws false readings, so wiping it down at the end of every shift while it's still warm is standard practice among crews. Screed heater circuits get flagged too: a failed temperature sensor on one heating zone typically just drops that zone to a fixed or limited heat output rather than killing the whole screed, so uneven temperature across the screed width is the tell, not a fully cold screed. Corroded or heat-damaged wiring harness connectors near the engine and aftertreatment bay are the other repeat offender across all three generations.

What's the wear pattern on screed plates and auger flights, and what do worn ones look like in practice?

Screed plates are the fastest-wearing part on any generation of this paver. A new plate runs roughly 12 mm (0.5 in) thick; once it wears down toward about 6 mm (0.25 in), it's due for replacement. Wear concentrated at the front or rear corners rather than even across the plate usually points to a twisted screed frame or a bad initial setup, not just normal material wear. Auger flight wear shows up as streaking in the finished mat or visibly sharpened, thinned edges. Check auger bearing play by hand at the mounts — noticeable movement means the bearings and seals need attention before the play works its way into a bent shaft.

What do operators say about the tamper bar and screed edge, and when does it become a safety issue?

Tamper bar condition gets checked before every shift on these pavers — it's a wear item that also drives mat compaction quality. As the bar edge wears down toward a knife edge it loses the stroke geometry that compacts material evenly, and a bar that thin is more prone to catching or cracking under load. Community practice is to swap it before it gets that thin rather than run it to failure, since a fractured tamper bar at full operating stroke near the screed is a pinch and projectile hazard. Have your dealer verify tamper bar clearance and stroke setting at your next service interval before returning the paver to full production.

What should I check when evaluating a used Cat AP-300 paver?

Confirm the exact generation first — base AP300 (3054C), AP300D (C4.4 ACERT with DPF), or AP300F (C3.3B with DPF plus SCR/DEF) — since maintenance history and emissions-system condition differ a lot between them. Walk the wear path: screed plate thickness at all corners, auger flight condition and bearing play, tamper bar edge, and conveyor/feeder chain tension. On the undercarriage, check the front bogie wheel mounts for play or bent shafts and rear tire wear, plus front-wheel-assist function on units so equipped. Cycle the feed sensors and screed heat zones to confirm even heating and clean sensor response. On D and F series, pull any active or stored aftertreatment or DEF fault codes before committing — a paver limped along on an ignored regen or DEF fault can mean an expensive aftertreatment bill down the road. Have your dealer verify engine hours, fault-code history, and aftertreatment component condition with a full diagnostic pull before finalizing a used purchase.

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

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