Caterpillarasphalt paver

Caterpillar AP-600

Maintenance schedule, common problems & OEM parts breakdown

The Cat AP-600 is a mid-to-high production wheel (rubber-tired) asphalt paver built for highways, rural roads, streets, and mid-sized paving jobs, sized between the smaller AP-500 wheel paver and the larger AP655/AP1000 wheel and track pavers in Caterpillar's line. The nameplate has covered more than one distinct machine: the original 2006-2010 generation ran a Cat 3056E ATAAC turbocharged, air-to-air aftercooled diesel rated around 173 gross hp (129 kW); a Tier 3 transitional AP600D moved to a Cat C6.6 ACERT engine; and current production reuses the bare "AP600" name on a Tier 4 Final/Stage V machine built around a Cat C4.4 ACERT base engine (also rated near 173 gross hp/129 kW) with a C7.1 ACERT offered as an upgrade option on some configurations. Operating weight varies by series, screed, and options, running roughly 13.8 to 18.2 tonnes (30,500 to 40,100 lb). All generations pair with a wheeled tractor and a choice of vibratory or tamper-vibratory screeds, with hydraulic screed extensions reaching out to about 7.5 m (24.6 ft) of paving width depending on screed model.

What changed across the AP-600's generations is mostly emissions tier and electronics: the mechanical/early-electronic 3056E gave way to the C6.6 ACERT Tier 3 unit, then to the fully electronic, aftertreatment-equipped C4.4/C7.1 ACERT engines used today, each swap bringing different filtration, cooling, and ECM diagnostic requirements even though the model name stayed the same. Screed heating also evolved, moving toward integrated generator-fed heating systems for faster startup and more even mat temperature on later F-series and current machines. Because Caterpillar has now reused "AP600" for two functionally different machines nearly two decades apart, correct engine and generation identification matters more than usual for anyone buying used or sourcing parts — filters, engine sensors, ECM components, and even some hydraulic parts are not interchangeable across the 3056E, C6.6, and C4.4/C7.1 generations. The AP-600 remains a common find in the used paving market given its long production run and broad dealer network support, making accurate serial-number-to-engine matching the first step before ordering parts or budgeting a rebuild.

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-600 specifications

Engine

Engine model (2006-2010 AP600)	Cat 3056E ATAAC, 6-cylinder turbocharged, air-to-air aftercooled diesel
Displacement (2006-2010 AP600)	6.0 L (366.2 cu in)
Gross power (2006-2010 AP600)	129 kW (173 hp) @ 2200 rpm
Net power (2006-2010 AP600)	121 kW (162 hp)
Emissions tier (2006-2010 AP600)	U.S. EPA Tier 3-era engine, typical for this generation
Engine model, base (current AP600)	Cat C4.4 ACERT, 4-cylinder turbocharged-aftercooled diesel
Displacement, base engine (current AP600)	4.4 L (268.5 cu in)
Gross power, base engine (current AP600)	129 kW (173 hp) @ 2200 rpm
Engine model, optional (current AP600)	Cat C7.1, 6-cylinder turbocharged-aftercooled diesel
Displacement, optional engine (current AP600)	7.01 L (428 cu in)
Gross power, optional engine (current AP600)	151 kW (205 hp) @ 2200 rpm
Net power (current AP600)	Not published in dealer spec sheets; only gross power is listed
Emissions tier (current AP600)	U.S. EPA Tier 4 Final / EU Stage V

Weights

Operating weight with screed (2006-2010 AP600)	18.1 t (39,904 lb)
Shipping weight, paver only (2006-2010 AP600)	approx. 14.15 t (31,200 lb); figure varies by source
Operating weight, SE47 FM screed (current AP600)	16,659 kg (36,716 lb)
Operating weight, SE50 V screed (current AP600)	17,125 kg (37,754 lb)
Operating weight, SE60 FM screed (current AP600)	17,380 kg (38,316 lb)
Operating weight, SE60 V screed (current AP600)	17,262 kg (38,056 lb)
Operating weight with C7.1 engine option, wide screed	approx. 17,794 kg (39,229 lb); varies by configuration and source
Shipping weight, paver only (current AP600)	13,556-13,558 kg (29,391-29,891 lb); varies by source

Dimensions

Transport length with screed (2006-2010 AP600)	6.4 m (21 ft)
Transport length without screed (2006-2010 AP600)	5.0 m (16.41 ft)
Transport width (2006-2010 AP600)	2.5 m (8.21 ft)
Transport height (2006-2010 AP600)	3.7 m (12.14 ft)
Width, hopper open (2006-2010 AP600)	3.2 m (10.5 ft)
Transport length (current AP600)	6.4 m (20.9 ft)
Transport width (current AP600)	2.9 m (9.8 ft); one source lists 2.55 m, varies by configuration/source
Transport height (current AP600)	3.0-3.3 m (9.9-10.8 ft); varies by source
Operating length (current AP600)	6.6 m (21.75 ft)
Operating width (current AP600)	3.3 m (10.8 ft)

Performance

Max paving speed (2006-2010 AP600)	60 m/min (196.9 ft/min)
Max travel speed (2006-2010 AP600)	15.1 km/h (9.4 mph)
Paving width range (2006-2010 AP600)	standard 2.5 m, max 4.7 m, hydraulic extension to 7.5 m
Max paving speed (current AP600)	76 m/min (250 ft/min)
Max travel speed (current AP600)	16 km/h (10 mph)
Max material throughput (current AP600)	1300 tonnes/hr (1433 US tons/hr)
Paving width, SE47 FM screed (current AP600)	2.44-6.2 m (8'-20'6")
Paving width, SE50 V screed (current AP600)	2.55-6.5 m (8'4"-21'4")
Paving width, SE60 FM screed (current AP600)	3.0-7.8 m (10'-25'6")
Paving width, SE60 V screed (current AP600)	3.0-7.5 m (9'10"-24'6")
Paving width, C7.1 engine with extended screed	up to 8.0 m (26'4") per one dealer source

Service capacities (summary)

Fuel tank (current AP600)	278 L (73 US gal)
Hydraulic oil tank (current AP600)	219 L (58 US gal)
Cooling system (current AP600)	approx. 31 L (8 US gal); one source lists 37 L, varies by source
DEF tank (current AP600)	19.1 L (5 US gal)
Washdown spray tank (current AP600)	approx. 27-30 L (7.9 US gal); varies by source
Engine oil capacity	Not documented in available dealer literature for this model; verify with dealer or operation manual
Fluid capacities, 2006-2010 AP600	Not documented for this earlier generation in available sources

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

AP-600 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter) - Cat C4.4 ACERT	approx. 11 L (11.6 US qt), varies by sump/gradeability option - verify exact figure on data plate or OMM refill chart	Cat DEO-ULS multigrade diesel engine oil. Viscosity by climate: SAE 10W-30 for -18C to 40C ambient, SAE 15W-40 for -9.5C to 50C ambient, Cat DEO-ULS SYN 5W-40 for -30C to 50C ambient. Requires ULSD-rated (15 ppm sulfur or less) fuel-compatible oil for the Tier 4 Final aftertreatment system.
Cooling system	31 L (8.0 US gal)	Cat ELC (Extended Life Coolant), premixed or concentrate to 50/50 with water; do not mix with conventional green coolant. Use a lower-freeze-point blend in cold climates per the coolant's freeze-point chart.
Fuel tank	278 L (73.0 US gal)	Ultra-low sulfur diesel (ULSD, 15 ppm sulfur max). Use winter-blend or treated fuel below freezing to prevent gelling; summer-grade fuel in warm climates.
DEF tank (Diesel Exhaust Fluid)	19.1 L (5.0 US gal)	API-certified Diesel Exhaust Fluid, 32.5% high-purity urea solution, required for the Tier 4 Final SCR aftertreatment system.
Hydraulic system (tank)	219 L (58.0 US gal)	Cat HYDO Advanced 10 multi-viscosity hydraulic oil. Cat TDTO or Cat MTO are listed alternates where Cat HYDO is unavailable. Select viscosity grade for ambient temperature per the Cat fluids chart; colder climates call for a lighter multigrade to keep cold-start viscosity within spec.
Washdown / spray tank	30 L (7.9 US gal)	Water or a Cat-approved biodegradable asphalt release agent for the screed spray system. Straight diesel fuel is not recommended as a release agent - it flashes off at hot-mix temperatures and can attack the asphalt binder.
Propel drive / final drives	not separately documented - wheel drive motors and gearing are serviced through the hydraulic system on this model	n/a - see hydraulic system oil above
Grease points (chassis, screed, conveyor, auger bearings)	spec only, no reservoir capacity	Cat multipurpose grease (NLGI 2 lithium complex), or Cat Advanced 3Moly / Extreme Application grease for high-load or high-temperature screed and auger bearing points. Apply per the lubrication schedule in the OMM.

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

Caterpillar AP-600 maintenance schedule

Service interval	Tasks
Every 50 h	Check engine oil level and top off before start-up Check coolant level in the sight glass or overflow bottle Check hydraulic tank oil level with the screed folded to running position Drain the fuel/water separator and check for contamination Walk-around inspection of the screed, auger, and conveyor for asphalt buildup or damage Grease auger and conveyor drive chain and screed slide rails weekly
Every 250 h	Change engine oil and the engine oil filter Replace the fuel filter elements (primary and secondary) Check and adjust alternator and fan drive belt tension Pull an S·O·S oil sample from the hydraulic tank Check auger gearbox oil level and top off as needed Inspect auger and conveyor drive chain tension and adjust
Every 500 h	Replace the hydraulic system return filter element Service or replace the engine air filter primary element Pull a Level 1 coolant sample and check corrosion inhibitor concentration Check the propel gearbox oil level Torque wheel mounting hardware to spec Check screed vibrator shaft bearings for play
Every 1,000 h	Change hydraulic tank oil or extend per S·O·S sample results Change auger and conveyor gearbox oil Inspect turbocharger shaft for play and check for oil leakage at the seals Check engine mounts and vibration dampers Verify ECM diagnostic codes and recalibrate as required on electronic-engine series Inspect main hydraulic pump and drive motor couplings for wear
Every 2,000 h	Change engine coolant (extended-life coolant) or perform the coolant extender service Inspect and rebuild screed vibrator shaft and bearings as needed Inspect auger gearbox bearings and seals for wear Overhaul or replace propel drive motors showing reduced output Inspect hopper wing and floor wear plates and replace as needed
Every 4,000 h	Full extended-life coolant replacement Preventive replacement of high-pressure hydraulic hoses on a fixed schedule Overhaul propel final drives and wheel bearings Replace screed heating elements and inspect wiring harness insulation for asphalt heat damage Inspect and resurface or replace screed plates worn past service limits

Servicing the AP-600 beyond the schedule

Predictive Maintenance & Fluid Analysis

Run S·O·S sampling on engine oil and hydraulic oil at every scheduled interval; asphalt dust and heat cycling accelerate hydraulic oil oxidation faster than on earthmoving machines. Track auger and conveyor gearbox oil for water or moisture intrusion from wash-down. On C4.4/C7.1-equipped current-production units, pull ECM fault history at each service to catch injector or aftertreatment trends before they strand the paver mid-mat. Confirm screed heater circuit amperage draw before each paving season.

Corrective & Common Repairs

Auger flights and conveyor chains wear fastest from abrasive mix contact and need regular tension checks and replacement before flighting thins out. Screed plates and extension wear strips lose thickness with mat contact and cause mat texture defects when worn. Tamper bar bushings and screed vibrator bearings loosen with hours and show up as uneven compaction. Hydraulic cylinder seals on screed lift, extend, and crown cylinders are common leak points given constant thermal cycling near the mat.

Overhaul & Rebuild Points

High-hour AP-600s typically need propel drive motor and gearbox rebuilds first, since creep-speed paving loads these components continuously. Main hydraulic pump wear shows up as slow screed response and reduced tamper/vibratory output. Auger gearbox bearings and seals need periodic rebuild given constant abrasive exposure. Engine overhaul scope depends on generation — 3056E and C6.6 units are due for turbo and injector work earlier than the electronically controlled C4.4/C7.1 series with tighter emissions control.

Seasonal & Environmental Servicing

Check coolant freeze protection and glow plug/ether-start systems before cold-weather paving on any engine generation. Verify screed heater function and element condition before the start of paving season, since a failed heater directly affects mat quality on cold-lay jobs. Clean asphalt buildup from the hopper, auger, and conveyor at the end of every shift; baked-on material accelerates wear and hides cracks. Protect ECM wiring and connectors on C4.4/C7.1 machines from pressure-washer intrusion around the engine bay.

AP-600 common service parts

Part number	Part	Notes
067-6897	Element Kit, Fuel Filter	Fuel system service	Check fitment →
145-4501	Filter Element As-Fuel	Fuel system service	Check fitment →
7W-2327	Filter As-Engine Oil	Lubrication service	Check fitment →
5C-1777	Nut	Scheduled service item	Check fitment →

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

AP-600 fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
100-03 / 100-04	Engine Oil Pressure Sensor circuit fault - signal voltage above normal (03) or below normal (04)	Open or shorted wiring at the oil pressure sensor connector, corroded pins, or a failed sensor	Inspect the sensor connector and harness for damage/corrosion, check sensor supply voltage against spec, replace sensor if reading stays out of range
100-01	Engine Oil Pressure - data valid but below normal (actual low oil pressure, not a wiring fault)	Low oil level, plugged oil filter, worn oil pump, wrong oil viscosity	Shut the engine down, check oil level and filter condition, verify pump pressure before restarting
110-03 / 110-04	Engine Coolant Temperature Sensor circuit fault - voltage above or below normal	Damaged two-pin sensor connector or open/shorted sensor wiring	Check the connector for corrosion, test sensor resistance against spec, replace the sensor if out of range
110-00	Engine Coolant Temperature above normal - actual overheat condition, can trigger a power derate	Low coolant level, restricted radiator core, failed fan drive or belt, stuck thermostat	Let the engine idle to cool, check coolant level and radiator for debris or blockage, inspect fan drive and belt tension
102-03 / 102-04	Boost/Intake Manifold Pressure Sensor circuit fault	Open or shorted sensor wiring, damaged three-pin connector, plugged sensor sense port	Inspect connector and harness, verify sensor supply voltage, replace sensor if faulty
111-01	Engine Coolant Level low	Coolant leak, low coolant fill, faulty coolant level sensor	Check coolant level at the surge tank, inspect hoses and radiator for leaks, top off with the correct coolant and bleed air if needed
168-02	Electrical System (battery) Voltage erratic, intermittent, or incorrect	Loose or corroded battery terminal, failing alternator/charging system, poor ground or main harness connection	Check battery terminals and ground straps, load-test the battery, test charging system output
190-02	Engine Speed/Timing Sensor signal erratic or intermittent	Damaged speed sensor wiring or connector, sensor air gap out of spec, sensor failure	Inspect sensor wiring and connector, check and reset sensor air gap, replace sensor if the fault persists

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

AP-600 attachments & work tools

Screeds - FM (front-mount extender)

SE47 FM screed paves roughly 2.4-6.2 m (8-20.5 ft); SE60 FM extends the range further, roughly 3.0-7.8 m (10-25.5 ft). Extenders sit ahead of the main screed, and both accept bolt-on berm plates and extension packages for extra-wide mats.

Screeds - V/VT (rear-mount extender)

SE50 V, SE50 VT, SE60 V, SE60 V XW, and SE60 VT XW screeds are rear-extending options for the AP600; VT variants add vibratory compaction and XW widens the base paving range. Pave-start assistant is offered on this screed family.

Legacy extendible screeds (earlier AP600 generation)

Earlier AP600/AP600D builds used the AS-3251 (2.5-4.7 m / 8-15.4 ft, up to 7.5 m with solid bolt-on extensions) and AS-4251 double-width screed (2.55-5.0 m / 8.4-16.4 ft, up to roughly 7.5-7.8 m with extensions). Both offered variable-frequency tamper/vibrator settings and a choice of LPG or electric screed heat - treat these as the prior-generation screed line, not the current FM/V lineup.

Screed heating system

Electric screed heat runs off the paver's onboard generator; sources give 15-25 minutes to working temperature depending on screed size and ambient conditions. Generator output is quoted at up to 70 kW on the current AP600 line for screed heat and auxiliary power - verify exact rating against the data plate since some prior-generation/D-suffix documentation shows a smaller genset.

Mainframe / paving-width extensions

Manual and power-operated mainframe extension kits widen the hopper/tunnel feed system to match wide-screed configurations. Wide-width paving packages are offered as a factory option alongside the extendable screeds for maximum-width mats.

Material handling attachments

Auger extensions lengthen material distribution across wide screed setups. Power folding front apron and an adjustable push-roller are standard feed-control items; optional leveling devices and sonic or contact-type feed sensors (including a hopper level/material height sensor) tune automatic material flow.

Towing / hitch hardware

A truck hitch is available for coupling to the delivery truck during material transfer, paired with a tow-point sensor/indicator; a second tow-point indicator is an available option. The tow-point linkage is designed for consistent screed flotation across the extender range.

Washdown system

Optional washdown pump, reel, and tank are offered for end-of-shift asphalt release-agent cleaning of the screed and hopper; tank capacity is around 30 L (7.9 US gal) per the factory options list.

Berm plates and extension packages

Bolt-on berm plates and screed-edge extension packages are offered for both the FM and V/VT screed families to shape mat edges and add incremental paving width without swapping the full screed.

Operating stations

Dual operator stations (left and right) are standard/available, letting the operator run material and grade controls from either side of the machine - a configuration option rather than a work tool, but relevant to how attachments and sensors are wired for each side.

All AP-600 assemblies by section

Every catalogued assembly group for the Caterpillar AP-600. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Air Inlet And Exhaust System

233-8649 Turbocharger Gp

03***48	Fitting-Brass	1
10***53	Stud	3
10***54	Nut	6
10***56	Bolt	2

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Basic Engine

216-8620 Camshaft Gp

15***56	Camshaft	1
21***20	Camshaft Group	1

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228-7371 Cover Gp-Valve Mechanism

10***04	Gasket	1
11***05	Seal-O-Ring	1
12***06	Seal; (Engine Oil Fill Cap)	1
13***08	Cap As; (Engine Oil Filler)	1

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216-8316 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)	2
06***74	Washer-Thrust; (0.18-mm Os)(Lower)	2

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216-8235 Cylinder Block Gp

03***02	Bearing	1
06***02	Dowel	14
06***05	Plug	1
06***08	Plug	1

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216-8231 Cylinder Block Gp

20***18	Housing As	1
20***19	Bolt; (M8x1.25x16-mm)	10
21***31	Cylinder Block Group	1
21***35	Cylinder Block Group	1

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216-8343 Cylinder Head Gp

15***73	Gasket-Cylinder Head	1
16***20	Pin	2
21***35	Cylinder Head Group	1
21***43	Cylinder Head Group	1

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216-8335 Cylinder Head Gp

06***43	Plug-Side-(1.251 Dia.)	3
13***50	Valve-Exhaust	6
13***60	Cap	12
14***55	Valve-Inlet	6

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231-2182 Drive Gp-Accessory

10***73	Seal-O-Ring	1
10***75	Bearing	1
10***76	Clip	1
10***78	Bolt; (M10x1.5x25-mm)	1

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236-1095 Drive Gp-Fan

10***87	Bolt; (M10x1.5x85-mm)	4
10***34	Pulley	1
13***38	Housing As	1
13***28	Spacer	1

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228-7418 Fastener Gp-Cylinder Head

12***15	Bolt; (M8x16x1.25-mm)	3
22***18	Fastener Group-Cylinder Head	1

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234-2653 Flywheel Gp

03***87	Ring-Starting Motor; (126-Teeth)	1
0S***03	Bolt,Machine Fuel Pump Drive Gear Mounting	10
10***31	Flywheel As	1
23***53	Flywheel Group	1

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217-1499 Gear Gp-Front

06***27	Bushing-Terminal	1
06***28	Circlip	1
21***48	Gear As-Idler; (31-Teeth)	1
21***99	Gear Group-Front	1

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234-2651 Housing Gp-Flywheel

10***17	Plug	3
11***63	Bolt; (M8x1.25x12-mm)	2
12***83	Bolt; (M10x1.5x30-mm)	6
19***09	Plug	1

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221-6835 Housing Gp-Front

06***78	Washer	1
06***79	Dowel	1
06***97	Element Kit, Fuel Filter	1
06***00	Plate-Retaining	1

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228-7462 Lifting Gp-Engine

14***53	Plate	1
14***49	Plate-Lifting	1
22***62	Lifting Group-Engine	1
6I***54	Bolt; (M10x1.5x25-mm)	4

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226-3586 Mounting Gp-Engine

10***87	Plug	6
11***13	Stud; (M16x45-Thd)	3
17***11	Stud	4
22***86	Mounting Group-Engine	1

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236-1100 Mounting Gp-Fan

11***49	Nut; (M12-1.75x93-mm-Thd)	4
13***68	Stud	4
13***69	Extension-Fan	1
23***00	Mounting Group-Fan	1

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234-2666 Pan Gp-Oil

11***80	Pan As-Oil	1
11***81	Tube As	1
11***82	Bracket	1
11***30	Clip	1

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216-8324 Piston & Rod Gp

06***83	Bolt-Rod Cap	2
12***36	Ring-Retaining	2
13***48	Bushing	1
16***93	Rod As; (White)	6

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236-6604 Plug Gp-Cylinder Block

03***63	Plug	2
23***04	Plug Group-Cylinder Block	1

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239-1349 Plug Gp-Cylinder Block

06***24	Plug	2
23***49	Plug Group-Cylinder Block; -Oil Gallery	1

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233-2765 Plug Gp-Engine -Timing Case

23***65	Plug Group-Engine; -Timing Case	1
2B***58	Plug--To Block Upper Front Air Manifold	1

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226-3523 Pulley Gp-Crankshaft

10***41	Bolt; (M12x1.75x25-mm)	8
11***65	Pulley	1
22***23	Pulley Group-Crankshaft	1
24***49	Damper	1

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146-8956 Rocker Arm Gp

00***06	Ring-Retaining	2
06***83	Plug-Shaft End	2
06***87	Spring-Shaft	4
06***88	Spring-Shaft	2

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216-8619 Valve Mechanism Gp

06***95	Rod	12
13***53	Tappet	12
14***56	Rocker Arm Group	1
21***19	Valve Mechanism Group	1

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Cooling System

228-7387 Connection Gp-Water

14***15	Seal-O-Ring; (Water Temperature Regulator)	1
14***88	Seal; (Housing, Regulator)(Temperature Regulator Housing)	1
16***36	Ring; (Water Temperature Regulator)	1
16***37	Plug	1

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233-2639 Cooler Gp-Fltr Base & Eng Oil

11***45	Connector	2
12***15	Bolt; (M8x16x1.25-mm)	14
14***83	Bolt; (M10x1.5x45-mm)(Starter Motor)	4
15***55	Hose	1

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221-5369 Pump Gp-Water

10***71	Bolt	1
10***05	Bolt; (M8x1.25x90-mm)	3
14***05	Cover	1
14***06	Gasket-Cover; (Cylinder Head)	1

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Electrical And Starting System

234-5966 Alternator Gp-Charging

23***66	Alternator Group-Charging	1
24***63	Lockwasher	1
25***60	Heater As; (Air Inlet)	1
7W***51	Resistor; (Air Inlet Heater)	1

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235-6348 Starting Aid Gp -Heater

03***55	Valve As-Check; (Starting Aid Heater Lines)	1
06***98	Nut; (3/8-24-Thd)	1
06***99	Ferrule	1
10***83	Nut; (3/16), . Drum	1

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235-6362 Starting Aid Gp -Lines

22***50	Starting Motor Group-Electric	1
23***62	Starting Aid Group; -Lines	1
6I***64	Stud; (M10x1.5x30-mm)	3
6I***94	Nut; (M10x1.15-Thd)	3

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234-2656 Starting Motor Gp-Electric

10***58	Bolt; (M8x1.25x14-mm)	3
11***63	Bolt; (M8x1.25x12-mm)	1
14***83	Bolt; (M10x1.5x45-mm)(Starter Motor)	1
21***86	Spacer; (10.5x20x32-mm Thk)	1

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228-7487 Wiring Gp-Engine

10***58	Bolt; (M8x1.25x14-mm)	3
11***63	Bolt; (M8x1.25x12-mm)	1
14***83	Bolt; (M10x1.5x45-mm)(Starter Motor)	1
21***86	Spacer; (10.5x20x32-mm Thk)	1

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Engine Arrangement

243-3040 Engine Ar

21***22	Engine Ar-Primary	1
24***40	Engine Ar	1

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264-0259 Engine Ar

21***22	Engine Ar-Primary	1
26***59	Engine Ar	1

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211-5322 Engine Ar-Primary

21***22	Engine Ar-Primary	1
21***31	Cylinder Block Group	1
21***16	Crankshaft Group	1
21***24	Piston & Rod Group	1

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243-3039 Installation Ar-Engine

24***39	Installation Ar-Engine	1
24***40	Engine Ar	1

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Fuel System

141-7844 Base Gp-Fuel Filter

10***39	Nut	1
10***40	Cap; (Fuel Filter)	1
10***41	Seal; (Plunger)	1
10***42	Plug	1

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235-6347 Filter Gp-Fuel

14***44	Base Group-Fuel Filter	1
23***47	Filter Group-Fuel; -Secondary	1

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235-6367 Lines Gp-Fuel Filter

06***68	Nut-Fuel Line; (1/2-In)	1
06***69	Olive-Fuel Tube	1
23***67	Lines Group-Fuel Filter	1

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235-6331 Pump Gp-Fuel Injection

10***30	Bolt; (M10x1.5x20-mm)	1
10***77	Stud	3
10***74	Stud	1
11***63	Bolt; (M8x1.25x12-mm)	3

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219-2455 Pump Gp-Fuel Transfer

03***49	Plug	1
06***68	Nut-Fuel Line; (1/2-In)	3
06***69	Olive-Fuel Tube	6
10***30	Bolt; (M10x1.5x20-mm)	3

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Lubrication System

216-9683 Filter Gp-Engine Oil

21***83	Filter Group-Engine Oil	1
7W***27	Filter As-Engine Oil	2

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235-9692 Pump Gp-Engine Oil

06***33	Gasket	1
10***16	Bolt; (M6x16-mm)	2
11***70	Stud	1
11***02	Housing As	1

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Machine Arrangement

243-3038 Common Ar

24***38	Common Ar	1
24***39	Installation Ar-Engine	1

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275-9166 General Ar

26***59	Engine Ar	1
27***66	General Ar	1

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AP-600 serial number reference

The PIN plate on the AP-600 is mounted on the paver frame near the operator's station, typically on the right-hand side rail or console area near the steps up to the platform. The PIN reads as an 8-character string: the first 3 letters are the prefix identifying model/series and plant, followed by a 5-digit sequential unit number. Always cross-check the PIN prefix against the plate's stamped model designation (AP-600 vs AP-600D) since Caterpillar reused nearby prefixes across paver updates.

Prefix	Identifies	Notes
B2S	AP-600 wheel asphalt paver (base/original series, pre-D)	Ties to the original AP-600 wheel paver line, pre-D-series. Only a single documentation source names this prefix; no independent equipment listing with an actual B2S-stamped PIN was found. Treat as unconfirmed and verify against the machine's data plate or with a dealer before using for parts lookup.
TFM	AP-600D wheel asphalt paver	Confirmed on a 2010-built AP-600D unit (Tier 3 update of the base AP-600, front-mounted cooling package, dual operator stations).
TFZ	AP-600D wheel asphalt paver	Confirmed on 2011- and 2012-built AP-600D units. Same D-series family as TFM; TFM and TFZ appear to cover different production runs/years within the AP-600D range rather than different configurations.

Frequently asked questions

What engine does the Caterpillar AP-600 use?

It varies by series. The original 2006-2010 AP-600 used a Cat 3056E ATAAC turbocharged diesel rated around 173 gross hp (129 kW). The Tier 3 transitional AP600D used a Cat C6.6 ACERT engine. Current-production units badged simply "AP600" use a Cat C4.4 ACERT base engine (about 173 gross hp/129 kW), with a C7.1 ACERT offered as an option on some configurations. Confirm the engine family from the serial plate before ordering parts.

What is the operating weight of the Caterpillar AP-600?

Operating weight runs roughly 13.8 to 18.2 tonnes (30,500 to 40,100 lb) depending on series, screed choice, and options. Earlier 3056E-powered and AP600D machines trend toward the heavier end of that range; current C4.4-powered paver-only weights trend lighter. Always verify against the specific configuration and screed fitted.

What replaced the Caterpillar AP-600?

Within its own lineage, the original AP-600 was followed by the Tier 3 AP600D and then the Tier 4 Final AP600F before Caterpillar dropped the letter suffix and returned to the bare "AP600" name for current production. The model still sits in Cat's current large-paver lineup between the smaller AP500 and the larger AP655/AP1000 track and wheel pavers, rather than being discontinued outright.

What AP-600 owners discuss

What engine does the AP-600 actually run, and does that change by production year?

Two distinct generations exist under this name. Early-production machines (roughly 2006-2010) run the Cat 3056E ATAAC (air-to-air aftercooled) diesel. Current-production bare "AP600" runs a Cat C4.4 ACERT base engine, with a C7.1 offered on higher-output configurations. The two generations do not share fluid specs, filters, or fuel-system parts. Confirm the engine family off the dataplate before ordering parts or assuming a fix from one generation applies to the other.

What's the most common complaint on the older 3056E-powered units?

Intermittent crank-no-start, traced by owners and independent shops to the electronic fuel injection pump and its control wiring rather than the base engine. Reported culprits: a failed voltage-load-protection module near the ECM, corroded or loose injection-pump connectors, and pump timing drifting out of spec after a pump swap if the timing pin wasn't set exactly to the service manual procedure. This engine has no dash-readable fault codes, a factory diagnostic tool is needed to pull them. Have your dealer verify pump timing and ECM wiring before condemning the injection pump itself.

What do owners of the current C4.4 ACERT generation flag?

Rough idle and unstable fuel rail pressure with no fault code logged, reported in the field as a weak fuel pressure sensor or tired transfer pump rather than an injector fault. Being Tier 4 Final, the engine runs SCR/DOC aftertreatment on DEF, and low DEF quality or a loading DOC pulls power and forces regen cycles, which shows up as an unexpected mid-shift derate on a paving run. Keep DEF fresh and don't let the tank run near empty during a paving day. Have your dealer verify aftertreatment health if derates recur.

The AP-600 rides on wheels, not tracks. What do operators say about traction and tire wear?

The AP-600 is Cat's wheel (rubber-tired) paver, so there's no track chain to budget for; tire cut/chunk damage and drive-hub seals are the equivalent wear items. Operators report wheel pavers can spin under a heavy head-of-material on resurfacing or overlay work, and traction drops fast on wet or oil-slicked base. On soft or wet subgrade, a tracked machine is generally the better tool for the job. Inspect tires for even wear and sidewall cuts regularly, and don't run reduced tire pressure to chase traction, it accelerates sidewall damage.

Screed heat is uneven across the plates. What's the usual cause?

Screed heat is generator-fed (roughly 70 kW, about 94 hp, on this machine) and touchscreen-adjustable by zone. Uneven mat temperature is most often corrosion or a loose connection at a heating-element terminal, or a failed zone thermostat/controller, rather than the generator itself. Grime buildup on the harness accelerates connector corrosion over time. A single zone tripping its breaker points to a shorted element in that zone, not a bad main harness. Check elements and harness sections zone by zone with a meter before replacing the generator.

What wears fastest on the material delivery system, and does it matter which generation?

Auger and conveyor wear is generation-independent, it's driven by tonnage through the machine, not hours. Watch for auger flights thinning from full diameter with edges going sharp instead of flat, stretched conveyor chains sagging in the tunnel, floorplate grooving where chains have dug in, and bearing seals failing and letting mix contaminate the bearing, grease fittings caked in dried asphalt are a sign the seal is already gone. When evaluating a machine, cross-check tonnage records against hour meter reading rather than relying on hours alone.

What should I check before buying a used AP-600?

Confirm the engine family off the dataplate first (3056E versus C4.4/C7.1), parts and DEF requirements differ and the model name alone won't tell you. Compare hour meter to tonnage paved if records exist; a well-kept paver can reasonably reach 7,000-8,000+ hours, but only if the wear-parts program (augers, flights, chains, floorplates, hydraulic seals) was kept current rather than deferred. Inspect tires for cuts and uneven wear, check auger bearing play and flight thickness, cycle the screed heat fully and watch for slow or uneven zones, and have the seller pull codes with the factory diagnostic tool instead of trusting "runs fine", the older 3056E units especially hide faults without it. Have your dealer verify engine hours, aftertreatment/DEF system health on current-gen units, and hydraulic pump condition before finalizing an offer.

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

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