Caterpillarasphalt paver
Caterpillar AP-800
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar AP-800 is a rubber-tired, 8 ft (2.4 m) class asphalt paver built across three factory generations. The base AP-800/AP-800B (serial prefix 1BF) runs a largely mechanical machine powered by a Perkins-derived turbocharged T4.236 diesel around 100-102 hp. The AP-800C (prefix 1PM) is the best-documented series, powered by a Cat 3054DIT turbocharged diesel rated 107 hp gross/101 hp net at 2200 rpm. The AP-800D (prefix A5P) closes out the line with a Cat 3054C turbocharged diesel rated around 130 hp at 2200 rpm. Operating weight runs roughly 10.7-12.2 tonnes (23,500-26,900 lb) depending on series and screed fitted, with a hopper capacity in the 6.5-6.9 tonne range. Four screed setups were offered over the line's life: Extend-A-Mat 8-16B and 10-20B, Pavemaster 8B and 10B, and the base 8 ft screed extendable out to roughly 15.5-20 ft (4.7-6.1 m) hydraulically. The AP-800 sits as a discontinued predecessor generation ahead of Caterpillar's current AP400/455/500/555 rubber-tired paver line, with no single named 1:1 successor.
Across the three generations the biggest change is the engine and its electronics: the base AP-800/AP-800B's Perkins-derived T4.236 is a simple mechanical-injection diesel with no engine electronics to fault-code, while the AP-800C and AP-800D move to Cat's own 3054-family turbocharged engine, adding real horsepower headroom (up to 130 hp on the D) for wider mat widths and hotter mix work. Hydraulic tank and fuel capacity also grew from the B to the C, reflecting a heavier-duty hydraulic wing-fold and screed system. In today's used and parts market the AP-800 line matters because it is a long-running, mechanically simple, rubber-tired paver that a lot of municipal and small-contractor fleets still run past 8,000-10,000 hours — parts demand centers on tamper bar bushings, screed heat components, hydraulic wing-fold cylinders, and 3054-family engine wear parts, and because the line was replaced outright rather than renamed, correct series identification by serial prefix is essential before ordering anything engine- or screed-related.
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-800 specifications
Engine
| Engine model (early/B-series) | Turbocharged diesel, factory-designated T4.236, naturally-aspirated-derived 4-cylinder block shared with the early 3054 family |
| Gross power (B-series) | 76 kW (102 hp) |
| Displacement (B-series) | 3.86 L (235.6 cu in) |
| Engine model (C-series) | Cat 3054DIT, four-stroke, four-cylinder, turbocharged diesel |
| Gross power (C-series, @2200 rpm) | 80 kW (107 hp) |
| Net power (C-series, @2200 rpm) | 75 kW (101 hp) |
| Bore x stroke (C-series) | 100 mm x 127 mm (3.937 in x 5.0 in) |
| Displacement (C-series) | 4.0 L (243 cu in) |
| Emissions (C-series) | Meets EPA/CARB emissions regulations for the period; no power derate required to 2134 m (7,000 ft) altitude |
| Engine model (D-series) | Cat 3054C, turbocharged diesel |
| Gross power (D-series, @2200 rpm) | 97 kW (130 hp), per manufacturer product literature; independent third-party spec-sheet confirmation not found, treat as reported figure |
| Cylinders | 4, all series |
Weights
| Operating weight, tractor only (C-series) | 12 199 kg (26,901 lb) |
| Operating weight w/ Pavemaster 8B screed (C-series) | 13 575 kg (29,930 lb) |
| Operating weight w/ Pavemaster 10B screed (C-series) | 13 860 kg (30,550 lb) |
| Operating weight w/ Extend-A-Mat 8-16B screed (C-series) | 15 195 kg (33,500 lb) |
| Operating weight w/ Extend-A-Mat 10-20B screed (C-series) | 15 470 kg (34,100 lb) |
| Operating weight, tractor only (B-series) | 10 659 kg (23,501 lb) |
| Operating weight w/ screed (B-series) | 11 902 kg (26,242 lb), standard screed configuration; lighter than C-series screed pairings above, so figures vary by generation and screed choice |
| Ground pressure | Not published for this model |
Dimensions
| Length with push roller, w/ Extend-A-Mat B screed (C-series) | 6508 mm (21'3") |
| Length with push roller, w/ Pavemaster B screed (C-series) | 6013 mm (19'9") |
| Length with truck hitch, w/ Extend-A-Mat B screed (C-series) | 6966 mm (22'10") |
| Length with truck hitch, w/ Pavemaster B screed (C-series) | 6496 mm (21'4") |
| Operating width, 8 ft screed (C-series) | 3269 mm (10'9") |
| Operating width, 10 ft screed (C-series) | 3327 mm (10'11") |
| Overall height (C-series) | 3023 mm (9'11") |
| Transport width, hoppers raised, with end gates, 8 ft screed (C-series) | 2718 mm (8'11") |
| Transport width, hoppers raised, with end gates, 10 ft screed (C-series) | 3327 mm (10'11") |
| Transport width, hoppers raised, without end gates, 8 ft models (C-series) | 2438 mm (8'0") |
| Transport width, hoppers raised, without end gates, 10 ft models (C-series) | 3048 mm (10'0") |
| Transport height, muffler removed (C-series) | 2600 mm (8'6.5") |
| Wheelbase (C-series) | 2337 mm (92 in) |
| Length with screed (B-series) | 5972 mm (19'7"), shorter than the C-series chassis figures above |
| Transport width (B-series) | 2594 mm (8'6") |
| Transport height (B-series) | 2667 mm (8'9") |
| Width with hopper open (B-series) | 3300 mm (10'10") |
Performance
| Pave speed, low range (C-series) | 0-46 m/min (0-150 ft/min) |
| Pave speed, high range (C-series) | 0-76 m/min (0-250 ft/min) |
| Travel speed, low range (C-series) | 0-11.3 km/h (0-7 mph) |
| Travel speed, high range (C-series) | 0-19 km/h (0-12 mph) |
| Travel speed, max (B-series) | Up to 20.9 km/h (13 mph) reported, slightly above the C-series high range; varies by series and tire choice |
| Standard paving width | 2.44 m (8 ft) |
| Maximum paving range, Extend-A-Mat 8-16B screed | 1.8 m to 6.1 m (6' to 20'2") |
| Maximum paving range, Pavemaster 8B screed | 1.8 m to 6.1 m (6' to 20') |
| Maximum paving range, Extend-A-Mat 10-20B screed | 2.44 m to 7.37 m (8' to 24'2") |
| Maximum paving range, Pavemaster 10B screed | 2.44 m to 9.14 m (8' to 30') |
| Hopper capacity | 5.5 cu m (195 cu ft) |
| Truck entry width | 3182 mm (10'5") |
| Truck dump height | 584 mm (23") |
| Auger diameter | 406 mm (16 in) |
| Gradeability | Not published for this model; asphalt pavers of this class are rated for low-speed positioning only, not grade-climbing duty |
Service capacities (summary)
| Fuel tank (C-series) | 189 L (50 gal) |
| Hydraulic oil tank (C-series) | 189 L (50 gal) |
| Cooling system (C-series) | 19 L (5 gal) |
| Engine oil | Not published in available factory literature; verify with dealer or engine O&M manual for exact refill capacity |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
AP-800 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 9.5 L (2.5 US gal) | Cat Diesel Engine Oil (DEO) spec, SAE 10W-30 for normal/moderate climates on the turbocharged Perkins-based T4.236 diesel; select a lighter winter grade or heavier hot-climate grade per Cat's ambient-temperature viscosity chart. Change oil and filter every 200 service hours. |
| Cooling system | 21 L (5.5 US gal) | Cat coolant/antifreeze to Cat ELC or Cat DEAC spec, glycol-base, rated to roughly -37 deg C (-35 deg F) protection. Use a pre-mixed or properly diluted concentrate per climate. |
| Fuel tank | approx. 163 L (43.1 US gal) — same 1BF-prefix production run as the base AP-800; not separately broken out for the earliest 1BF00001-00224 build, verify against the machine's data plate | No. 2-D diesel fuel per Cat fuel spec; switch to a winterized or No. 1-D blend in cold weather. |
| Hydraulic system (system and tank combined) | 113 L (29.9 US gal) | Cat TDTO (Transmission/Drive Train Oil) family, cross-referencing to an ATF Type F-equivalent fluid; pick the SAE viscosity grade for ambient temperature per Cat's TDTO chart, lighter grade for cold starts, heavier for sustained heat. |
| Differential | not broken out as a discrete liter figure in the available fluid chart — spec only | Gear oil to GL-5 spec, SAE 80W-90 (Cat TDTO or Cat FDAO equivalent). |
| Enclosed final-drive gear housings | spec only, no discrete capacity documented | GL-5 gear oil, SAE 80W-90 for normal climates or SAE 85W-140 for sustained heat or heavy load (Cat TDTO/FDAO equivalent). |
| Hydraulic pump drive unit | spec only, no discrete capacity documented | GL-5 gear oil, SAE 80W-90 (Cat TDTO equivalent). Change every 100 service hours. |
| Grease (chassis and pin lubrication points) | spec only — no reservoir capacity applies | NLGI 1 extreme-pressure grease (Cat Multipurpose/EP-type grease); apply at scheduled grease points per the lubrication chart. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar AP-800 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the AP-800 beyond the schedule
Predictive maintenance & fluid analysis
Sample engine oil (T4.236, 3054DIT, or 3054C depending on series) and hydraulic oil at every scheduled change to track wear metals from the tamper drive bushings, propel pump, and auger/conveyor gearboxes. Watch hydraulic oil for asphalt-fine contamination signaling wing-fold or screed-lift cylinder seal wear. Track coolant condition closely given the cross-draft-mounted engine draws intake air near the hot hopper. Rising engine wear metals or fuel dilution on a 3054-family unit usually points to injector or turbo wear before a visible smoke or power complaint shows up.
Corrective & common repairs
Recurring failures on the AP-800 line are tamper bar bushings and pitman arms wearing under vibration load, screed heater burner or electric-element failures that cut mat quality, hydraulic wing-fold cylinder seal leaks, and solid rubber tire wear or cracking on the rubber-tire chassis. On AP-800C/D's 3054-family engine, injector and turbo wear show up as smoke and power loss under load. On the older AP-800/AP-800B's T4.236, expect age-related injection pump and head gasket issues rather than electronic faults.
Overhaul & rebuild points
At major hours, plan on rebuilding the tamper drive (bushings, eccentric shaft, vibrator bearings), the screed leveling and crown cylinders, and the propel pump/motor feeding the rubber-tire drive. The 3054DIT/3054C or T4.236 engine typically needs an in-frame overhaul — liners, pistons, injectors — once oil analysis shows rising wear-metal trends. Auger and conveyor chain-and-sprocket sets, screed plate wear inserts, and extension slide rails wear together and are usually replaced as a matched set during a rebuild pass.
Seasonal & environment servicing
Before paving season, confirm screed heat (burner or electric element, depending on series) reaches working temperature quickly — a cold screed tears the mat on the first passes of the day. Check hydraulic oil viscosity grade for cold-start conditions in shoulder-season work. In hot climates, keep close watch on engine and hydraulic cooling since the cross-draft intake pulls combustion air near the hot hopper. For winter storage, park with tamper bars raised and screed plates protected against corrosion and moisture.
AP-800 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CID 0100 FMI 01 | Engine oil pressure below normal operating range | Low oil level, worn oil pump, plugged filter, or failing pressure sensor | Check oil level and filter condition first, then verify sensor wiring before replacing the sender |
| CID 0100 FMI 03 | Engine oil pressure sensor circuit voltage above normal | Chafed or shorted sensor wiring, corroded connector | Inspect sensor harness and connector for shorts to power before condemning the sensor |
| CID 0110 FMI 00 | Engine coolant temperature above normal (overheat) | Low coolant, blocked radiator/screen, slipping or failed fan drive, thermostat stuck closed | Shut down, let cool, check coolant level and radiator airflow before restarting |
| CID 0110 FMI 04 | Engine coolant temperature sensor circuit voltage below normal | Shorted sensor circuit or failed temperature sender | Check sensor connector and wiring for a short to ground, replace sender if wiring checks good |
| CID 0111 FMI 01 | Engine coolant level low | Coolant leak, low system fill, or faulty level sensor | Inspect for external/internal leaks and top off coolant, then recheck sensor operation |
| CID 0168 FMI 04 | Battery/system voltage below normal | Weak battery, loose or corroded ground/power connections, failing alternator | Load-test battery and check charging system output and ground connections |
| CID 0174 FMI 03 | Fuel temperature sensor circuit voltage above normal | Damaged sensor wiring or connector corrosion in the fuel temperature circuit | Inspect and clean connector, test circuit resistance against spec before replacing sensor |
| CID 0190 FMI 08 | Engine speed/timing sensor abnormal signal frequency | Damaged or misadjusted speed/timing sensor, debris on sensor tip, or wiring fault | Check sensor air gap and wiring, clean or reseat sensor before replacement |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
AP-800 attachments & work tools
Screed family
Base machine ships with an 8 ft (2.44 m) VIP extendable vibratory screed. Bolt-on extensions widen the paving path in stages, with the class rated for roughly 8 ft to 15 ft 6 in (2.44-4.72 m) hydraulically, and up to about 20 ft (6.1 m) with full bolt-on extensions fitted. Later D-series literature notes two screed choices were offered at the factory, though the exact second model designation is not documented in surviving spec sheets — confirm with dealer records for a given serial range.
Screed heating and plates
Screed plates are electrically heated for faster startup and consistent mat temperature, standard practice across this Cat screed generation. Extender sections carry their own heat elements so extended width sections match the main screed temperature.
Screed mounting/extension method
Extensions are bolt-on to the heavy-duty screed mainframe rather than a quick-coupler system; front-mount and rear-mount hydraulic extender arrangements were both offered, with an optional power-extending mainframe for on-the-fly width changes.
Auger system
Hydraulically adjustable, outboard-mounted feeder augers with independent outboard feeder drives to reduce mix segregation. Auger diameter runs roughly 14 in (355 mm) on earlier B-series units up to 16 in (406 mm) on C-series units — varies by series/configuration. Auger extensions/tunnel extensions widen material delivery to match extended screed widths.
Hopper
Front-mounted hopper with hydraulically folding wings that tilt up to push material to the center feed; rated capacity is roughly 6.5-6.9 tonnes (7.2-7.6 tons), varying slightly by series.
Grade and slope control
Compatible with bolt-on averaging-beam, ski, and sonic/ultrasonic grade sensors referencing string line, curb, or the previous pass; higher-end automated grade-and-slope packages were also fitted by some dealers as an add-on kit rather than a factory-standard item.
Auxiliary power / lighting option
Optional tractor-mounted single-phase generator, about 8 kW, feeding four 120V and two 240V receptacles for night paving lights and power tools at the site.
Undercarriage/tire configuration
AP-800 is a rubber-tired (wheel) paver, not a track unit. Typical fitment is solid rubber front tires around 13x22 with rear tires around 16.00x24 — no track/undercarriage attachment options apply to this model.
Tamper/compaction bar
Screed strike-off uses a tamper bar and vibratory compaction combination typical of this Cat screed class; no separate tamping-only screed variant is documented specifically for AP-800, unlike some later Cat paver lines that split tamper-bar vs vibratory-only screed SKUs.
All AP-800 assemblies by section
Every catalogued assembly group for the Caterpillar AP-800. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Basic Engine
8t7485 Actuator Gp-Linear
| 8T***85 | Actuator Group-Linear | 1 |
7c3102 Camshaft Gp
| 7C***02 | Camshaft Group | 1 |
2w7828 Cover Gp-Front Housing
| 2W***28 | Cover Group-Front Housing | 1 |
7w2534 Cover Gp-Valve Mechanism
| 7W***34 | Cover Group-Valve Mechanism | 1 |
7c8213 Crankshaft Gp
| 7C***13 | Crankshaft Group | 1 |
7c9259 Cylinder Block As-Part 1 Of 2
| 7C***59 | Cylinder Block As | 1 |
7c9259 Cylinder Block As-Part 2 Of 2
| 7C***59 | Cylinder Block As | 1 |
7c9258 Cylinder Block Gp
| 7C***58 | Cylinder Block Group | 1 |
7c3750 Cylinder Head Gp
| 7C***50 | Cylinder Head Group | 1 |
7c9257 Cylinder Head Gp
| 7C***57 | Cylinder Head Group | 1 |
7c3188 Cylinder Head Gp
| 7C***88 | Cylinder Head Group | 1 |
7c3108 Flywheel Gp
| 7C***08 | Flywheel Group | 1 |
1w7878 Gear Gp-Front
| 1W***78 | Gear Group-Front; Gear Gp-Front Idler | 1 |
8c8159 Gear-Box As
| 8C***59 | Gearbox As | 1 |
7c3103 Housing Gp-Flywheel
| 7C***03 | Housing Group-Flywheel | 1 |
7w1143 Housing Gp-Front
| 7W***43 | Housing Group-Front | 1 |
7w2537 Lifting Eye Gp-Engine
| 7W***37 | Lifting Group-Engine; Lifting Eye Gp-Engine | 1 |
7c3116 Mounting Gp-Engine
| 7C***16 | Mounting Group-Engine | 1 |
7c3104 Pan Gp-Engine Oil
| 7C***04 | Pan Group-Oil; Pan Gp-Engine Oil | 1 |
7w2511 Rod & Piston Gp
| 7W***11 | Piston & Rod Group; Rod & Piston Gp | 1 |
7x9024 Power Pack As-Part 6 Of 6
| 7X***24 | Power Pack As | 1 |
7x9024 Power Pack As-Part 5 Of 6
| 7X***24 | Power Pack As | 1 |
7x9024 Power Pack As-Part 2 Of 6
| 7X***24 | Power Pack As | 1 |
7x9024 Power Pack As-Part 3 Of 6
| 7X***24 | Power Pack As | 1 |
7x9024 Power Pack As-Part 4 Of 6
| 7X***24 | Power Pack As | 1 |
7x9024 Power Pack As-Part 1 Of 6
| 7X***24 | Power Pack As | 1 |
7c8209 Pulley Gp-Crankshaft
| 7C***09 | Pulley Group-Crankshaft | 1 |
7w2531 Valve Mechanism Gp
| 7W***31 | Valve Mechanism Group | 1 |
Brakes
819511 Brake System-Foot
| 08***11 | Brake As-Foot | 1 |
7x9945 Brake Gp
| 4L***37 | Hex Head Capscrew, 3/8 Nc X 1 1/2 In. (38 mm) | 8 |
| 6V***01 | Nut; (3/8-16-Thd)(Plate To Rh And Lh Bracket As) | 8 |
| 7X***78 | Valve Group-Brake | 2 |
8c7455 Brake Gp
| 8C***55 | Brake Group | 1 |
7x9378 Valve Gp-Brake
| 7X***78 | Valve Group-Brake | 1 |
Console/Panel
7x9019 Console As-Part 2 Of 2
| 7X***19 | Console As | 1 |
7x9019 Console As-Part 1 Of 2
| 7X***19 | Console As | 1 |
822614 Panel As-Instrument
| 08***14 | Panel As-Instrument | 1 |
819769 Panel As-Instrument
| 08***69 | Panel As-Instrument | 1 |
8c7633 Steering As
| 8C***33 | Steering As | 1 |
Cooling System
7c9264 Cooler & Filter Gp-Engine Oil
| 7C***64 | Cooler & Filter Group-Engine Oil | 1 |
7c9264 Cooler & Filter Gp-Engin Oil
| 7C***64 | Cooler & Filter Group-Engine Oil | 1 |
7w2608 Fan Gp
| 7W***08 | Fan Group | 1 |
7x9972 Lines As-Oil Cooler
| 7X***72 | Lines As-Oil Cooler | 1 |
7c3112 Lines Gp-Water
| 7C***12 | Lines Group-Water; Lines Gp-Engine Water | 1 |
4w7684 Pump Gp-Water
| 4W***84 | Pump Group-Water | 1 |
7c3111 Pump Gp-Water
| 7C***11 | Pump Group-Water | 1 |
Engine Arrangement
7c9250 Engine Ar-Part 1 Of 2
| 1W***78 | Gear Group-Front; Gear Gp-Front Idler | 1 |
| 1W***10 | Lines Group-Fuel Filter | 1 |
| 2W***28 | Cover Group-Front Housing | 1 |
7c9250 Engine Ar-Part 2 Of 2
| 7C***04 | Pan Group-Oil; Pan Gp-Engine Oil | 1 |
| 7C***06 | Pump Group-Engine Oil | 1 |
| 7C***07 | Pump Group-Fuel Injection | 1 |
Feeder And Screw Conveyor
7x8245 Chain As-Drag
| 7X***45 | Chain As-Drag | 1 |
8c3924 Chain As-Drag
| 8C***24 | Chain As-Drag | 1 |
7x9021 Conveyor As
| 7X***21 | Conveyor As | 1 |
819552 Conveyor As-Drag
| 08***52 | Conveyor As-Drag | 1 |
819555 Conveyor As-Screw
| 08***55 | Conveyor As-Screw | 1 |
819513 Gate System-Drag Conveyor
| 08***13 | Gate System-Drag Conveyor | 1 |
8c8160 Torque Hub As
| 8C***60 | Hub As-Torque | 1 |
7r4243 Kit-Grease Line
| 09***99 | Fitting-Grease; (Hydraulic) | 2 |
| 4D***59 | Boss | 2 |
| 4S***99 | Str. Connector, 1/4in. J.I.C. X 1/4in. N.P.T. | 2 |
7r4244 Kit-Seal
| 2H***64 | Bolt-Hex Socket Head; (1/4-20x1.5in) | 4 |
| 6V***35 | Setscrew-Socket; (7/16-20x0.375-In) | 4 |
| 7R***77 | Collar | 2 |
7x9961 Lubrication System-Drag Convey0r
| 7X***61 | Lubrication Group | 1 |
7r4048 Lubrication Gp-Front Bearing
| 7R***48 | Lubrication Group-Front Bearing | 1 |
822575 Motor Gp-Hydraulic
| 08***75 | Motor Group-Hydraulic | 1 |
817761 Sensor Gp-Feed
| 08***61 | Sensor Group-Feed | 1 |
Frame
8c8000 Cylinder As-Hydraulic
| 8C***00 | Cylinder As-Hydraulic | 1 |
8c8001 Cylinder As-Hydraulic
| 8C***01 | Cylinder As-Hydraulic | 1 |
819507 Main-Frame As-Part 2 Of 2
| 08***07 | Frame As-Main | 1 |
819507 Main-Frame As-Part 1 Of 2
| 08***07 | Frame As-Main | 1 |
819512 Hopper As
| 08***12 | Hopper As | 1 |
819510 Plate As-Upper Deck Cover
| 08***10 | Plate As-Upper Deck Cover | 1 |
8c7457 Roller Ar-Push-(Oscillating)
| 8C***57 | Roller Ar-Push | 1 |
1c4717 Roller As-Push-Part 2 Of 2
| 1C***17 | Roller As-Push | 1 |
8c3948 Roller As-Push
| 8C***48 | Roller As-Push | 1 |
1c4717 Roller As-Push-Part 1 Of 2
| 1C***17 | Roller As-Push | 1 |
8c4339 Roller Gp-Push (8'6")
| 8C***39 | Roller Group-Push | 1 |
6r2241 Roller Gp-Push
| 6R***41 | Roller Group-Push | 1 |
5e9822 Roller Gp-Push
| 5E***22 | Roller Group-Push | 1 |
819636 Ski As-Traveling
| 08***36 | Ski As-Traveling | 1 |
8c7158 Ski Expansion Gp
| 8C***58 | Ski Expansion Group | 1 |
819515 Support As-Tow Arm
| 08***15 | Support As-Tow Arm | 1 |
7x9960 Support As-Tow Arm
| 7X***60 | Support As-Tow Arm | 1 |
Fuel System And Governor
7c3115 Filter Gp-Fuel
| 7C***15 | Filter Group-Fuel | 1 |
7x9985 Fuel System
| 7X***85 | Fuel Ar-Diesel | 1 |
1w8310 Lines Gp-Fuel Filter
| 1W***10 | Lines Group-Fuel Filter | 1 |
7w2588 Lines Gp-Fuel Injection
| 7W***88 | Lines Group-Fuel Injection | 1 |
8c7624 Pump As-Motor
| 8C***24 | Pump As | 1 |
7n6422 Pump Gp-Fuel
| 7N***22 | Pump Group-Fuel | 1 |
7c3139 Pump Gp-Fuel Injection
| 7C***39 | Pump Group-Fuel Injection | 1 |
7c3107 Pump Gp-Fuel Injection
| 7C***07 | Pump Group-Fuel Injection | 1 |
Hydraulic System
822340 Tow Arm Gp-Part 2 Of 2
| 08***40 | Arm Group-Tow; Tow Arm Gp | 1 |
822340 Tow Arm Gp-Part 1 Of 2
| 08***40 | Arm Group-Tow; Tow Arm Gp | 1 |
822343 Tow Arm Gp-10 Ft. Vip
| 08***43 | Arm Group-Tow; Tow Arm Gp-10'Fixed Screed | 1 |
822343 Tow Arm Gp
| 08***43 | Arm Group-Tow; Tow Arm Gp-10'Fixed Screed | 1 |
7r2768 Box As-Control
| 7R***68 | Box As-Control | 1 |
7r2802 Brace Gp
| 7R***02 | Brace Group | 1 |
7x9160 Burner Gp-8' Screed
| 7X***60 | Burner Group-Screed; Burner Gp-8' Screed | 1 |
7x8691 Control Gp-Crowning
| 7X***91 | Control Group-Crowning-Screed | 1 |
7x8699 Control Gp-Thickness
| 7X***99 | Control Group-Screed; Control Gp-Screed-Thickness | 1 |
8c4338 Control Gp-Tow Point
| 8C***38 | Control Group-Tow Point | 1 |
822608 Control Gp-10' Vip Screed
| 08***08 | Control Group-Vip Screed; Control Gp-10' Vip Screed | 1 |
822605 Control Gp-8'Vip Screed
| 08***05 | Control Group-Vip Screed; Control Gp-8' Vip Screed | 1 |
8c7454 Counterbalance Gp-Screed
| 8C***54 | Counterbalance Group-Screed | 1 |
5e9402 Covers Gp-10' Screed
| 5E***02 | Cover Group-Screed; Covers Gp-10' Screed | 1 |
8c7166 Cylinder Gp-Hydraulic
| 8C***66 | Cylinder Group-Hydraulic | 1 |
7x9161 Electrical Gp
| 08***12 | Junction Box As-Screed | 1 |
| 7R***68 | Box As-Control | 2 |
| 7X***61 | Electrical Group | 1 |
7x9162 Extension Gp-1'
| 6V***88 | Nut-Full (1/2-13 Thd); (1/2-13-Thd)(Full) | 10 |
| 7X***34 | Bolt-Plt; (1/2unc X 5) | 4 |
| 7X***62 | Extension Group-1' | 1 |
7x8967 Extension Gp-1 In. Screed-Vip-Lh
| 6V***88 | Nut-Full (1/2-13 Thd); (1/2-13-Thd)(Full) | 3 |
| 7X***67 | Extension Group-1' Lh Vip | 1 |
| 7X***70 | Extension Group-Auger | 1 |
7x8966 Extension Gp
| 6V***88 | Nut-Full (1/2-13 Thd); (1/2-13-Thd)(Full) | 3 |
| 7X***66 | Extension Group-1' Rh Vip | 1 |
| 7X***71 | Extension Group-Auger | 1 |
7x8856 Extension Gp-Vip-Lh
| 6V***88 | Nut-Full (1/2-13 Thd); (1/2-13-Thd)(Full) | 3 |
| 7X***56 | Extension Group-2' Lh Vip | 1 |
| 7X***58 | Extension Group-Screed; -Lh | 1 |
7x8857 Screed Gp-Extension
| 6V***88 | Nut-Full (1/2-13 Thd); (1/2-13-Thd)(Full) | 3 |
| 7X***57 | Extension Group-2' Rh Vip | 1 |
| 7X***59 | Extension Group-Screed; -Rh | 1 |
7x8970 Extension Gp-Auger
| 7X***70 | Extension Group-Auger | 1 |
7x8885 Extension Gp-Auger
| 7X***85 | Extension Group-Auger | 1 |
7x8886 Extension Gp-Auger
| 7X***86 | Extension Group-Auger | 1 |
7x8971 Extension Gp-Auger
| 7X***71 | Extension Group-Auger | 1 |
7x9165 Extension Gp-Lh
| 6V***88 | Nut-Full (1/2-13 Thd); (1/2-13-Thd)(Full) | 3 |
| 7X***70 | Extension Group-Auger | 1 |
| 7X***65 | Extension Group-Lh | 1 |
7x9164 Extension Gp-Rh 1'
| 6V***88 | Nut-Full (1/2-13 Thd); (1/2-13-Thd)(Full) | 3 |
| 7X***71 | Extension Group-Auger | 1 |
| 7X***64 | Extension Group-Rh; Extension Gp-Rh 1' | 1 |
7x9182 Extension Gp-Screed
| 7X***82 | Extension Group-Screed; -Rh | 1 |
7x9183 Extension Gp-Screed-Vip-L.H.
| 7X***83 | Extension Group-Screed; -Lh | 1 |
7x8858 Extension Gp-Screed-2 Ft. 4 In
| 7X***58 | Extension Group-Screed; -Lh | 1 |
7x8859 Extension Gp-Screed
| 7X***59 | Extension Group-Screed; -Rh | 1 |
7x9163 Finish Gp-Vip
| 7X***63 | Finish Group-Vip | 1 |
7x8684 Frame Gp-Screed
| 7X***84 | Frame Group-Screed; Frame Gp-Screed-Pavemaster | 1 |
7x8690 Endgate Gp
| 7X***90 | Gate Group-Screed End | 1 |
7x8693 Handrail Gp-Screed
| 7X***93 | Handhold Group-Screed; Handrail Gp-Screed | 1 |
822612 Junction Box As-Screed
| 08***12 | Junction Box As-Screed | 1 |
6r1367 Kit-Shift
| 6R***67 | Kit-Shift | 1 |
7x9977 Lines As-Conveyor/Auger Drive
| 7X***77 | Lines As-Auger/Conveyor Drive | 1 |
7x9978 Lines As-Conveyor/Auger Drive
| 7X***78 | Lines As-Auger/Conveyor Drive | 1 |
7x9982 Lines As-Brakes & Steering
| 7X***82 | Lines As-Brakes & Steering | 1 |
7x9976 Lines As-Hopper Raise
| 7X***76 | Lines As-Hopper Raise | 1 |
7x9983 Lines As-Hydraulic Brake Press
| 7X***83 | Lines As-Hydraulic Brake Press | 1 |
7x9975 Lines As-Hydraulic Steering
| 7X***75 | Lines As-Hydraulic Steering | 1 |
7x9980 Lines As-Screed Lift
| 7X***80 | Lines As-Screed Lift | 1 |
7x9974 Lines As-Steering & Screed Pressure
| 7X***74 | Lines As-Steer & Screed Press | 1 |
7x9971 Lines As-Suction
| 7X***71 | Lines As-Suction | 1 |
7x9986 Lines As-Transmission Shift
| 7X***86 | Lines As-Transmission Shift | 1 |
7x9981 Lines As-Truck Hitch
| 7X***81 | Lines As-Truck Hitch | 1 |
7x9979 Lines As-Vibrator Drive
| 7X***79 | Lines As-Vibrator Drive | 1 |
7x9973 Lines As-Wheel Drive
| 7X***73 | Lines As-Wheel Drive | 1 |
7x8962 Burner Gp-10' Screed
| 7X***62 | Lines Group-Fuel; Burner Gp-10' Screed | 1 |
7r6357 Fuel Gp-10' Fixed Screed
| 7R***57 | Lines Group-Fuel | 1 |
8c7616 Pump Gp-Auger-Conveyor Drive-Part 1 Of 2
| 8C***16 | Pump Group | 1 |
8c7989 Pump Gp-Hydraulic*R
| 8C***89 | Pump Group | 1 |
8c7987 Pump Gp-Auxiliary Drive*R
| 8C***87 | Pump Group | 1 |
8c7616 Pump Gp-Auger-Conveyor Drive-Part 2 Of 2
| 8C***16 | Pump Group | 1 |
7x9158 Screed Ar
| 08***07 | Vibrator Group-Screed; Vibrator Gp-10' Screed | 1 |
| 08***08 | Control Group-Vip Screed; Control Gp-10' Vip Screed | 1 |
| 7X***61 | Structural Group; Structural Gp-10' Vip | 1 |
7x9157 Screed Ar
| 08***04 | Vibrator Group-Screed | 1 |
| 08***05 | Control Group-Vip Screed; Control Gp-8' Vip Screed | 1 |
| 7X***57 | Screed Ar; Screed Ar-8' Vip | 1 |
7r0339 Screed Ar-10'
| 5E***00 | Vibrator Group-Screed; Vibrator Gp-10' Screed | 1 |
| 5E***02 | Cover Group-Screed; Covers Gp-10' Screed | 1 |
| 7R***39 | Screed Ar-10' Fixed | 1 |
8c3954 Screed Ar
| 08***43 | Arm Group-Tow; Tow Arm Gp-10'Fixed Screed | 1 |
| 7R***39 | Screed Ar-10' Fixed | 1 |
| 7X***62 | Extension Group-1' | 1 |
8c4335 Screed Ar-10' Vip
| 08***43 | Arm Group-Tow; Tow Arm Gp-10'Fixed Screed | 1 |
| 7X***58 | Screed Ar; Screed Ar 10' Vip | 1 |
| 7X***62 | Extension Group-1' | 1 |
8c3950 Screed Ar-8' Vip
| 08***40 | Arm Group-Tow; Tow Arm Gp | 1 |
| 7X***57 | Screed Ar; Screed Ar-8' Vip | 1 |
| 7X***62 | Extension Group-1' | 1 |
7x8689 Strike-Off Gp-10' Screed
| 7X***89 | Strike-Off Group-Screed; Strike-Off Gp-10' Screed | 1 |
7x8961 Structural Gp-10'-Vip-Part 1 Of 6
| 7X***61 | Structural Group; Structural Gp-10' Vip | 1 |
7x8961 Structural Gp-10'-Vip Screed-Part 5 Of 6
| 7X***61 | Structural Group; Structural Gp-10' Vip | 1 |
7x8961 Structural Gp-10'-Vip-Part 4 Of 6
| 7X***61 | Structural Group; Structural Gp-10' Vip | 1 |
7x8961 Structural Gp-10'-Vip-Part 2 Of 6
| 7X***61 | Structural Group; Structural Gp-10' Vip | 1 |
7x8961 Structural Gp-10'-Vip-Part 3 Of 6
| 7X***61 | Structural Group; Structural Gp-10' Vip | 1 |
7x8961 Structural Gp-10'Vip Screed-Part 6 Of 6
| 7X***61 | Structural Group; Structural Gp-10' Vip | 1 |
7x9159 Structural Gp-8' Vip Screed-Part 5 Of 7
| 7X***59 | Structural Group-Screed; Structural Gp-8' Vip Screed | 1 |
7x9159 Structural Gp-8' Vip Screed-Part 6 Of 7
| 7X***59 | Structural Group-Screed; Structural Gp-8' Vip Screed | 1 |
7x9159 Structural Gp-8' Vip Screed-Part 1 Of 7
| 7X***59 | Structural Group-Screed; Structural Gp-8' Vip Screed | 1 |
7x9159 Structural Gp-8' Vip Screed-Part 3 Of 7
| 7X***59 | Structural Group-Screed; Structural Gp-8' Vip Screed | 1 |
7x9159 Structural Gp-8' Vip Screed-Part 7 Of 7
| 7X***59 | Structural Group-Screed; Structural Gp-8' Vip Screed | 1 |
7x9159 Structural Gp-8' Vip Screed-Part 2 Of 7
| 7X***59 | Structural Group-Screed; Structural Gp-8' Vip Screed | 1 |
7x9159 Structural Gp-8' Vip Screed-Part 4 Of 7
| 7X***59 | Structural Group-Screed; Structural Gp-8' Vip Screed | 1 |
819514 Tank As-Hydraulic Oil
| 08***14 | Tank As-Hydraulic | 1 |
7x8208 Valve Bank As-2 Valve
| 7X***08 | Valve As | 1 |
822586 Valve As-Divided Flow
| 08***86 | Valve As-Flow Divider | 1 |
822607 Vibrator Gp-Screed-10 Ft. Vip
| 08***07 | Vibrator Group-Screed; Vibrator Gp-10' Screed | 1 |
5e9400 Vibrator Gp-10' Screed
| 5E***00 | Vibrator Group-Screed; Vibrator Gp-10' Screed | 1 |
822604 Vibrator Gp-Screed
| 08***04 | Vibrator Group-Screed | 1 |
Intake And Exhaust System
7w2565 Manifold Gp-Exhaust
| 7W***65 | Manifold Group-Exhaust | 1 |
7w2585 Manifold Gp-Inlet
| 7W***85 | Manifold Group-Inlet | 1 |
7w2584 Turbocharger Gp
| 7W***84 | Turbocharger Group | 1 |
7w2573 Turbocharger Gp
| 7W***73 | Turbocharger Group | 1 |
Lubrication System
7c3110 Fumes Disposal Gp
| 7C***10 | Fumes Disposal Group | 1 |
7c3105 Gauge Gp-Oil Level (Dipstick)
| 7C***05 | Gauge Group-Oil Level (Dipstick) | 1 |
7c3106 Pump Gp-Engine Oil
| 7C***06 | Pump Group-Engine Oil | 1 |
Power Train
817050 Differential As-Part 2 Of 5
| 08***50 | Axle Group-Drive | 1 |
817050 Differential As-Part 4 Of 5
| 08***50 | Axle Group-Drive | 1 |
817050 Differential As-Part 3 Of 5
| 08***50 | Axle Group-Drive | 1 |
817050 Differential As-Part 5 Of 5
| 08***50 | Axle Group-Drive | 1 |
817050 Differential As-Part 1 Of 5
| 08***50 | Axle Group-Drive | 1 |
8c8009 Cylinder Gp-Hydraulic
| 8C***09 | Cylinder Group-Hydraulic | 1 |
5e8835 Kit-Differential Cooling
| 5E***35 | Kit-Differential Cooling | 1 |
819508 Transmission & Axle As
| 08***08 | Transmission & Axle As | 1 |
Service Equipment And Supplies
819642 Decal As
| 08***00 | Decal-Cooling System | 1 |
| 08***93 | Decal-Diesel Fuel | 1 |
| 08***94 | Decal-Hydraulic Fluid | 1 |
9n7049 Hose Gp-Spraydown
| 9N***49 | Hose Group-Spraydown | 1 |
Slope And Grade Control
8c2975 Control Ar-Primary Grade
| 8C***75 | Control Ar-Primary Grade | 1 |
7x9987 Control As-Automatic Grade
| 7X***87 | Control As-Automatic Grade | 1 |
8c2974 Control As-Slope
| 8C***74 | Control As-Slope | 1 |
5e9807 Control Gp-Automatic Grade
| 5E***07 | Control Group-Automatic Grade | 1 |
8c2976 Controller As
| 8C***76 | Controller As-Single Grade | 1 |
8t8029 Controller Gp
| 8T***29 | Controller Group | 1 |
8c7159 Stringline Ar-Traveling
| 8C***59 | Stringline Ar-Traveling | 1 |
9n8911 Stringline As-Traveling
| 9N***11 | Stringline As-Traveling | 1 |
817214 Stringline As-Traveling
| 08***14 | Stringline As-Traveling | 1 |
Starting And Electrical System
6t1194 Alternator Gp-Part 2 Of 2
| 6T***94 | Alternator Group-Charging | 1 |
6t1194 Alternator Gp-Part 1 Of 2
| 6T***94 | Alternator Group-Charging | 1 |
6r3285 Beacon Gp
| 6R***85 | Beacon Group | 1 |
7x9969 Console As-Left Control
| 7X***69 | Console As-Control-Lh | 1 |
819768 Console As-Left Control
| 08***68 | Console As-Control-Lh | 1 |
7x9970 Console As-Right Control
| 7X***70 | Console As-Control-Rh | 1 |
819770 Console As-Right Control
| 08***70 | Console As-Control-Rh | 1 |
6r0699 Control Gp-Electrical
| 6R***99 | Control Group-Conv/Auger Pump Dr | 1 |
5e4869 Electrical As
| 5E***69 | Electrical As | 1 |
7x9016 Electrical As
| 7X***16 | Electrical As | 1 |
7x9967 Junction Box As-Main
| 7X***67 | Junction Box As-Main | 1 |
5e4870 Junction Box As-Main
| 5E***70 | Junction Box As-Main | 1 |
7r3075 Kit-Valve
| 7R***75 | Kit-Valve | 1 |
7r3076 Kit-Valve
| 7R***76 | Kit-Valve | 1 |
7t0618 Lamp Gp
| 7T***18 | Lamp Group | 1 |
7c9252 Mounting Gp-Alternator
| 7C***52 | Mounting Group-Alternator | 1 |
7c9269 Mounting Gp-Starting Motor-(Electric)
| 7C***69 | Mounting Group-Starting Motor; Mounting Gp- Starting Motor | 1 |
8c8278 Solenoid As
| 8C***78 | Solenoid As | 1 |
7w2606 Starting Aid Gp
| 7W***06 | Starting Aid Group | 1 |
9n7775 Valve As-Solenoid
| 9N***75 | Valve As-Solenoid | 1 |
Steering
7x9965 Bogie As-L.H.
| 7X***65 | Bogie As-Lh | 1 |
7x9966 Bogie As-R.H.
| 7X***66 | Bogie As-Rh | 1 |
8c8002 Cylinder As-Hydraulic
| 8C***02 | Cylinder As-Hydraulic; (Hydraulic) | 1 |
6r1368 Kit-Steering
| 6R***68 | Kit-Steering | 1 |
7x9964 Spindle & Hub As
| 7X***64 | Spindle & Hub As | 1 |
7x9963 Suspension As-Front
| 7X***63 | Suspension As-Front | 1 |
7r0197 Valve Gp-Steering
| 7R***97 | Valve Group-Steering; -Steering | 1 |
7x9962 Tires & Wheels As-Rear
| 7X***62 | Wheel & Tire As-Rear | 1 |
AP-800 serial number reference
On Cat rubber-tire pavers the PIN/data plate sits at the back of the machine, below the operator's station steps on the tractor frame. The plate shows the full Product Identification Number; the first three characters are the serial number prefix (tied to model and build series) and the remaining digits are the individual unit sequence number - together the last 8 characters of the PIN form the serial number used to match parts and manuals to a specific machine.
| Prefix | Identifies | Notes |
|---|---|---|
| 1BF | AP-800 / AP-800B (early rubber-tire tractor generation) | Earliest documented AP-800 production run, serials in the 1BF00001-00224 range, tied to this exact range by an operation and maintenance manual listing and a lubricant-spec reference. Turbocharged four-cylinder diesel rated around 102 hp, a smaller-displacement unit that precedes the 3054DIT used on later C-series machines. |
| 1PM | AP-800C | Rubber-tire tractor with Cat 3054DIT turbocharged diesel, four-stroke four-cylinder, 80 kW (107 hp) gross / 75 kW (101 hp) net at 2200 rpm, per the factory AP-800C spec sheet. Fully hydrostatic propel with two-speed variable-displacement wheel motors. Offered with Extend-A-Mat or Pavemaster screed options. Prefix appears in parts-catalog and service-manual listings tied specifically to the C-series tractor. |
| A5P | AP-800D | Later rubber-tire generation, Cat 3054C turbocharged diesel rated near 97 kW (130 hp) at 2200 rpm, engine mounted transversely for a cross-draft air intake away from the hopper. Optional tractor-mounted single-phase generator (8 kW) for job-site power. Prefix is documented in parts-catalog and service-manual references and the 3054C engine tie to this model is independently corroborated, but confirm exact serial range with dealer since no factory spec sheet with the prefix itself was found. |
Frequently asked questions
What engine does the Caterpillar AP-800 use?
It depends on series. The base AP-800 and AP-800B run a Perkins-derived turbocharged T4.236 diesel around 100-102 hp. The AP-800C runs a Cat 3054DIT turbocharged diesel rated 107 hp gross/101 hp net at 2200 rpm. The AP-800D steps up to a Cat 3054C turbocharged diesel rated around 130 hp at 2200 rpm. Confirm the engine family off the serial prefix (1BF, 1PM, or A5P) before ordering engine parts.
What is the operating weight of the Cat AP-800?
Weight varies by series and screed fitted, running roughly 10.7-12.2 tonnes (23,500-26,900 lb) for the base machine without screed, and higher once a Pavemaster or Extend-A-Mat screed is attached. Check the spec sheet for your exact serial and screed combination for a precise figure.
What replaced the Caterpillar AP-800?
Caterpillar discontinued the AP-800 line without a single direct named successor. It was superseded by the modern AP400/455/500/555 rubber-tired paver family, which replaced this entire generation of Cat pavers rather than continuing it under a new letter suffix.
What AP-800 owners discuss
Does engine performance and hydraulic response feel different across AP-800 generations?
Yes, and owners size up a used unit by engine first. Base AP-800/AP-800B (1BF prefix) run the Perkins-derived T4.236 naturally aspirated diesel and feel noticeably softer on hydraulic response under load, especially with a full hopper and screed extensions out. AP-800C (1PM prefix) moved to the turbocharged/aftercooled Cat 3054DIT and picks up meaningfully more usable power for propel and auger/conveyor duty. AP-800D (A5P prefix) runs the Cat 3054C, roughly 130 hp, and is regarded as the strongest and most consistent of the line for sustained mat production. Match the serial prefix to the engine before judging a machine's power complaints against another owner's experience — the three generations are not interchangeable in feel.
What quirks show up on the T4.236-powered base AP-800/AP-800B?
The T4.236 is a simple mechanical diesel and is generally reliable, but it is known to be fussy to bleed after any fuel filter change or fuel-line work — air trapped in the system causes hard starting and rough idle until it is fully purged. On higher-hour machines, oil ring wear shows up before compression drops, so the engine starts and runs fine but burns oil steadily; that is a top-end/liner wear signal, not a fuel problem. Watch for injection pump metering valves gumming up on machines that sat with old fuel, which mimics a low-power complaint.
What do owners flag on the 3054DIT/3054C engines in the AP-800C and AP-800D?
The recurring complaint on these turbocharged 3054 variants is overheating under sustained paving load, sometimes preceded by bright white exhaust smoke at low idle — that combination points to a cooling system or turbo/aftercooler fault, not just a thermostat. Fuel lift pump leakage and a worn injector pump front shaft seal are both known to let diesel migrate into the engine oil; running the engine in that state is hard on crank bearings, so an oil sample that smells or reads thin for fuel dilution should stop the machine, not just get a top-off. Most failures on this engine family trace back to deferred service intervals rather than a design flaw. Given the overheating and oil-dilution failure modes, have your dealer verify cooling system and oil condition before returning the machine to service.
What undercarriage and material-handling wear is typical for this class of rubber-tired paver?
On the rubber-tired AP-800 line, wear concentrates in the drive tires, bogies and planetary drive components from uneven terrain and hopper loading rather than a track undercarriage. In the material path, expect floor plates to warp, auger flights to wear pointed, conveyor chains to sag and stretch, and flight bars to let mix migrate underneath over time — all of which let contaminated mix reach the feeder bearings and degrade their seals. Drive and auger belts and chains should be checked and adjusted on a monthly cycle; inconsistent auger or conveyor speed from worn drives is a common root cause of segregation streaks at the screed rather than a screed problem itself.
What electrical or sensor issues come up most, and are they safety-related?
Two areas dominate: screed heater elements and grade-control sensors. Uneven screed heat-up is usually corrosion or loose terminals at the heating element connections rather than a bad element itself, and heat-up time is slower than expected any time the screed sits on the ground (the mat acts as a heat sink) or in wind with the screed floating. On machines fitted with sonic/ultrasonic grade sensors, wind, sun angle, and passing traffic can all cause erratic readings that look like a sensor fault but are environmental. Screed heater elements run hot enough to cause burns and, on older wiring, can be a fire risk if insulation has degraded — have your dealer verify heater wiring and element condition rather than working around a fault with the system live.
When the hydraulics feel sluggish or unresponsive, what's the usual cause?
Since the propel drive, conveyors, augers and screed all share the hydraulic system on this machine, a slow or unresponsive feel points owners first at pump wear or a slipping/worn pump drive belt rather than a valve fault. Low fluid level and internal pump wear from contaminated oil (often traced back to material ingress through worn feeder bearing seals) are the most commonly cited root causes. Because loss of propel or screed response mid-pave is a safety concern for the crew working around the machine, have your dealer verify hydraulic pump output and belt condition before diagnosing further downstream.
What should I check before buying a used AP-800?
First confirm the serial prefix to know which engine and generation you are actually buying — 1BF is the base AP-800/AP-800B with the T4.236, 1PM is the AP-800C with the 3054DIT, and A5P is the AP-800D with the 3054C; sellers and listings do not always specify this clearly. Pull an oil sample and check for fuel dilution and coolant intrusion, especially on 3054-engined units, given the known overheating and pump-seal leak patterns. Walk the material path for warped floor plates, worn auger flights, and slack or worn conveyor chains, and check feeder bearing seals for play, since contaminated hydraulic oil traces back to failures here. Confirm the screed heater elements cycle evenly and check wiring condition, and cycle the hydraulics through propel, auger, conveyor and screed extension to feel for sluggish or delayed response before agreeing on price.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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