Caterpillarcold planer(no series)
Caterpillar PR-750B
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar PR-750B is a self-propelled, three-track cold planer (asphalt/pavement milling machine) built for full-depth road milling rather than skid-steer attachment work. It runs a Cat 3412 V12 diesel, mechanically governed and turbocharged for its class, rated at roughly 559 kW (750 hp) gross. Operating weight runs close to 42,600 kg (about 94,000 lb) full load, though it varies by configuration, options fitted (water tank fill, conveyor and spray-bar options), and equipped attachments. It cut a standard width of about 3.05 m (10 ft) to a depth of up to 254 mm (10 in), driven across the ground on three track units rather than a wheeled chassis. The PR-750B belongs to Caterpillar's original cold planer lineup, built out of Caterpillar's 1985 manufacturing arrangement with CMI Corporation alongside sibling models such as the PR-75, PR-105, PR-275, and PR-450, with the larger PR-1000 above it in the range. Sources do not document a distinct bare-number "PR-750" predecessor or a single named direct successor for this specific model.
Across its production run the PR-750B held a stable core specification: the same 3412 engine, the same nominal weight and cutting geometry, and the same three-track layout, with running changes typical of the era rather than a documented second generation split. What changed over time in Caterpillar's broader cold planer range was the move away from these CMI-built, mechanically governed machines toward later PR-1000/PR-1000C class units and eventually the modern PM-series (hydrostatically driven, electronically governed cold planers). In today's used and parts market the PR-750B remains relevant mainly because of its mechanical simplicity: no electronic engine controls to fail, a widely supported 3412 engine platform shared with generators and marine applications, and a straightforward drivetrain that independent shops can still rebuild. Buyers look at it as an affordable, heavy-cutting-capacity milling machine for contractors who do not need modern grade-control electronics, and parts demand centers on drum components, track undercarriage parts, and 3412 engine wear items rather than any electronic modules.
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 PR-750B specifications
Engine
| Engine model | Cat 3412, 12-cylinder (V12, 65-degree vee), twin-turbocharged diesel |
| Displacement | 27.0 L (1,647.7 cu in) |
| Gross power | 559 kW (749.7 hp) — net power not published for this machine |
| Emissions tier | Not applicable — mechanical-era engine, predates Tier/Stage emissions regulation (machine dates to the mid-1980s CMI-derived Cat cold planer line) |
Weights
| Operating weight (full load) | 42,638 kg (94,000.8 lb) |
| Shipping weight | Not published separately from operating weight |
| Ground pressure | Not published |
Dimensions
| Operating length | 16.52 m (54.2 ft) |
| Shipping width | 3.60 m (11.8 ft) |
| Shipping height | 3.75 m (12.3 ft) |
| Discharge conveyor width | 91.4 cm (36 in) |
| Cutting (milling) width | 3.05 m (10 ft) |
| Cutting (milling) depth | 25.4 cm (10 in) |
| Track configuration | 3-track undercarriage; front and rear track width each 45.7 cm (18 in) |
| Wheelbase / ground clearance | Not published |
Performance
| Travel speed | 3.4 km/h (2.1 mph) |
| Milling (operating) speed | 22.9 m/min (75.1 ft/min) |
| Gradeability | Not published |
Service capacities (summary)
| Fuel tank | 1,230.5 L (325.1 gal) |
| Water spray (cutting drum dust/cooling) system | 4,542.4 L (1,200.1 gal) |
| Hydraulic system | Not published in available spec sources |
| Engine oil | Not published in available spec sources |
| Cooling system | Not published in available spec sources |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
PR-750B fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) — Cat 3412 V-12 diesel | Not published for this exact unit in available spec sheets — verify with dealer/OMM. The 3412 family in comparable large-frame applications typically falls in the 60-70 L (16-18 US gal) range with filter change, but this is not confirmed specifically for the PR-750B. | Cat DEO (Diesel Engine Oil), API CI-4/CH-4 grade or later Cat DEO-ULS on low-sulfur fuel. Viscosity by ambient temperature per Cat cold-weather guidance: SAE 15W-40 for general/warm climates, SAE 10W-30 or 0W-40 synthetic for cold-start conditions below roughly -10C. Not confirmed against the PR-750B OMM viscosity chart directly. |
| Cooling system | Not published for this exact unit in available spec sheets — capacity for the 3412 in this chassis is not documented in the sources checked; verify with dealer/OMM. | Cat ELC (Extended Life Coolant), factory premix or 50/50 concentrate-to-water. Extended service interval coolant, freeze protection to roughly -37C (-34F). Standard Cat DEAC/SCA-treated coolant is the older alternative on earlier-built units. |
| Fuel tank | 1230.5 L (325.1 US gal) | No. 2-D diesel fuel (ULSD on later-built units), per Cat diesel fuel specification. Winter-blend or fuel conditioner recommended in cold climates to prevent gelling. |
| Hydraulic system (including tank) | Not published for this exact unit — cold planers of this size commonly run large hydraulic reservoirs, but no PR-750B-specific figure was found; verify with dealer/OMM. | Cat HYDO Advanced (or equivalent Cat TDTO where the hydraulic and drivetrain compartments share a common oil on this machine class), viscosity grade selected per ambient temperature — typically ISO VG 46/68 equivalent for temperate climates, lighter grade for cold starts. |
| Water spray / dust suppression tank | 4542.4 L (1200.1 US gal) | Clean water; no Cat-branded fluid specification (non-lubricant system). Anti-freeze additive or tank drain-down advised for below-freezing storage. |
| Track drive / final drive compartments (front and rear track units) | Not published for this exact unit in available spec sheets — verify with dealer/OMM. | Cat TDTO (Transmission and Drive Train Oil) or Cat FDAO (Final Drive Axle Oil) per compartment type, viscosity graded by ambient temperature per standard Cat final-drive service guidance. |
| Grease (chassis, track rollers, cutter housing pins) — spec only | Not a refill volume; serviced by grease point, interval per OMM lube chart. | Cat Advanced 3Moly Grease (NLGI 2) as the general Cat multipurpose recommendation; Cat Utility Grease or Cat Extreme Application (XA) grease may apply to high-load cutter/track points where dealer guidance specifies. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar PR-750B 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 PR-750B beyond the schedule
Predictive Maintenance and Fluid Analysis
Pull scheduled oil samples from the 3412 V12, the drum gearbox, and each final drive rather than relying on hours alone; mechanically governed engines mask early wear that electronic diagnostics would otherwise flag. Track fuel filter water content closely given the machine's dusty, wet-milling environment. Monitor drum gearbox and final drive oil for metal fines, which on a three-track undercarriage carrying over 40 metric tons shows up as wear well before visible leaks or noise appear.
Corrective and Common Repairs
Expect frequent cutting bit and holder-block replacement from normal milling wear, plus conveyor belt, skirt, and idler wear from constant asphalt fines. On the propel side, mechanical governor linkage and fuel rack drift is common on the 3412 and needs periodic readjustment rather than a control-module reflash. Track pad and roller wear across all three track units is the most common undercarriage complaint given the machine's weight and constant reversing during milling passes.
Overhaul and Rebuild Points
Major work centers on the 3412 V12 (inframe overhaul, turbocharger exchange), the drum gearbox, and the final drives in each of the three track units, which absorb the full cutting load and machine weight. Drum housing and mounting-bolt fatigue around the cutting chamber is a known wear point on machines this age and should be inspected at overhaul. Track frame and sprocket reconditioning is typically bundled with final drive rebuilds rather than done separately.
Seasonal and Environment Servicing
Cold starts on the mechanically governed 3412 depend on functioning starting aids and clean fuel; drain and winterize the water spray system fully to prevent freeze-cracked lines and pump housings. In hot, dry milling conditions, clean radiator fins and spray nozzles more often since asphalt dust packs the cooling core and clogs the spray bar faster than normal ambient dust. Track undercarriage components should be checked more frequently in freeze-thaw conditions that trap grit in the roller frames.
PR-750B fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| LOW OIL PRESSURE (engine shutdown/warning lamp) | Engine oil pressure has dropped below the safe operating threshold for the Cat 3412 diesel. | Low oil level, worn oil pump, clogged suction screen, or a failed oil pressure sensor/switch. | Shut engine down immediately, check oil level and for external leaks, then verify the sensor/switch before restarting. |
| HIGH COOLANT TEMPERATURE (engine shutdown/warning lamp) | Engine coolant temperature has exceeded the safe operating range. | Low coolant level, radiator/core blocked with milling debris and dust, failed thermostat, or slipping/broken fan belt. | Idle down and shut off, let the engine cool, check coolant level and radiator fins/screen for packed debris before resuming work. |
| LOW COOLANT LEVEL | Coolant level sensor in the recovery tank or top tank has detected fluid below minimum. | External coolant leak (hose, water pump, radiator) or normal loss not topped off during service. | Inspect for leaks, top off with the correct coolant mix once cool, and recheck after a short run. |
| ENGINE OVERSPEED | Engine rpm has exceeded the governor's set maximum, tripping the protective shutdown. | Governor linkage or mechanical rack malfunction, or a sudden loss of load on the cutter drum drive. | Stop and inspect the fuel rack/governor linkage for binding or damage before restarting; do not repeatedly restart if the fault repeats. |
| AIR FILTER RESTRICTION | Intake air filter restriction indicator shows the element has reached its service limit, common on this engine family given heavy milling dust. | Clogged primary/secondary air filter element from rock and asphalt dust. | Service or replace the air filter element and reset the restriction indicator. |
| CHARGING SYSTEM / ALTERNATOR FAULT | Battery charging voltage is outside normal range, shown as a charge warning lamp on the gauge cluster. | Failed alternator, worn/loose drive belt, or a bad ground/battery connection. | Check belt tension and battery connections, then test alternator output; replace as needed. |
| LOW FUEL LEVEL | Fuel level sender indicates the tank has reached a low-level threshold. | Normal fuel consumption during long milling runs; large fuel capacity on this machine makes unexpected low readings worth checking against a stuck sender. | Refuel and confirm the gauge reading matches a dipstick or sight-level check if in doubt. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
PR-750B attachments & work tools
Cutting rotor and tool bits
Full-lane rotor spans roughly 3.05 m (10 ft) and carries around 216 carbide-tipped cutting tools set in a wrap pattern for even breakout. Depth of cut runs up to about 254 mm (10 in), typical for this large self-propelled milling class.
Tool holder / bit mounting system
Cutting tools sit in individual bolt-on holders around the drum rather than as a single bolt-on attachment; worn or damaged tools and holders are replaced individually on the rotor. Exact holder design (bolt-on vs quick-release conical style) is not documented for this specific serial range — treat as standard point-attack tooling for the class unless a dealer confirms otherwise.
Discharge conveyor
Front-mounted primary discharge conveyor is about 914 mm (36 in) wide and loads milled material directly into a following haul truck, standard arrangement for full-size cold planers of this size rather than a swap-in option.
Water spray / dust suppression system
Onboard water tank holds roughly 4,540 L (1,200 gal) feeding spray bars at the cutting drum, used to cool tools and control dust during milling. Capacity is a factory-fitted system, not a bolt-on kit.
Three-track undercarriage
Machine rides on a three-track crawler arrangement (paired rear tracks plus a steerable front track) rather than wheels, the standard chassis layout for this size of self-propelled planer; no wheeled or alternate-track configuration is confirmed for this model.
Engine / power package
Runs a Cat 3412 diesel rated near 559 kW (750 hp) as the fixed factory powertrain for this class-leading size; no alternate engine option is confirmed in available documentation for the PR-750B specifically.
All PR-750B assemblies by section
Every catalogued assembly group for the Caterpillar PR-750B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air System
817794 Air System-Cutter
| 08***94 | Air System Group-Cutter | 1 |
820051 Air System-Propelling
| 08***51 | Air System Group-Propelling | 1 |
817795 Lines Gp-Clutch Air
| 08***95 | Lines Group-Clutch Air | 1 |
817796 Mounting Gp-Valve
| 08***96 | Mounting Group-Valve | 1 |
8c7026 Valve Gp
| 8C***26 | Valve Group | 1 |
Basic Engine
7c4120 Adapter Gp
| 7C***20 | Adapter Group-Cylinder Head | 1 |
4n0965 Camshaft Gp-Single
| 4N***65 | Camshaft Group; (Crankcase) | 1 |
4n6866 Cover Gp-Cylinder Block
| 4N***66 | Cover Group-Cylinder Block | 1 |
6n1897 Cover Gp-Flywheel Housing
| 6N***97 | Cover Group-Flywheel Housing | 1 |
4n6798 Cover Gp-Front Housing
| 4N***98 | Cover Group-Front Housing; Front Structure Cover Group | 1 |
6n1400 Cover Gp-Oil Pan
| 6N***00 | Cover Group-Oil Pan | 1 |
4w2581 Cover Gp-Valve Mechanism-Part 1 Of 2
| 4W***81 | Cover Group-Valve Mechanism | 1 |
4w2581 Cover Gp-Valve Mechanism-Part 2 Of 2
| 4W***81 | Cover Group-Valve Mechanism | 1 |
4n0922 Crankshaft Gp
| 4N***22 | Crankshaft Group; Crankshaft Group | 1 |
7n0841 Cylinder Block As
| 7N***41 | Cylinder Block As | 1 |
1179512 Cylinder Block As
| 11***12 | Cylinder Block As | 1 |
1261372 Cylinder Block As
| 12***72 | Cylinder Block As | 1 |
2w4859 Cylinder Block Gp
| 2W***59 | Cylinder Block Group | 1 |
1261373 Cylinder Block Gp
| 12***73 | Cylinder Block Group | 1 |
1179514 Cylinder Block Gp
| 11***14 | Cylinder Block Group | 1 |
4n1201 Cylinder Block Gp
| 4N***01 | Cylinder Block Group | 1 |
1053800 Cylinder Head As
| 10***00 | Cylinder Head As | 1 |
7w2243 Cylinder Head As*R
| 7W***43 | Cylinder Head As | 1 |
7w2241 Cylinder Head As
| 7W***41 | Cylinder Head As | 1 |
4w7007 Cylinder Head Gp-Part 2 Of 2*R
| 4W***07 | Cylinder Head Group; Head Group-Cylinder | 1 |
7w2242 Cylinder Head Gp
| 7W***42 | Cylinder Head Group | 1 |
4w7007 Cylinder Head Gp-Part 1 Of 2*R
| 4W***07 | Cylinder Head Group; Head Group-Cylinder | 1 |
8n5572 Pulley & Damper Gp
| 8N***72 | Damper & Pulley Group; Pulley And Damper Group | 1 |
1016023 Damper Gp
| 10***23 | Damper Group | 1 |
4w9965 Damper Gp
| 1K***72 | Locknut Horn To Guard | 12 |
| 4W***65 | Damper Group | 1 |
| 8M***78 | Stud-Taperlock | 12 |
819994 Drive Gp-Fan
| 08***94 | Drive Group-Fan | 1 |
820005 Drive Gp-Front Stub
| 08***05 | Drive Group-Front Stub | 1 |
7r7502 Engine Gp-Part 2 Of 2
| 7R***02 | Engine Group | 1 |
7r7502 Engine Gp-Part 1 Of 2
| 7R***02 | Engine Group | 1 |
7n3079 Flywheel Gp
| 7N***79 | Flywheel Group; Flywheel Group | 1 |
4n6341 Gear Gp-Front Timing
| 4N***41 | Gear Group-Front; Front Timing Gear Group | 1 |
4n3825 Gear Gp-Rear
| 4N***25 | Gear Group-Rear; Rear Timing Gear Group | 1 |
4n2931 Housing Gp-Flywheel
| 4N***31 | Housing Group-Flywheel; Housing Group-Flywheel | 1 |
4n5226 Housing Gp-Front
| 4N***26 | Housing Group-Front; Front Housing Group | 1 |
7n7767 Lifting Gp-Engine
| 7N***67 | Lifting Group-Engine; Engine Lifting Eye Group | 1 |
820013 Lubrication Gp-Fan
| 08***13 | Lubrication Group-Fan | 1 |
4n2647 Pan Gp-Oil
| 4N***47 | Pan Group-Oil; -Engine | 1 |
2w9054 Rod & Piston Gp-12 Required
| 2W***54 | Piston & Rod Group; Connecting Rod & Piston Group | 1 |
2w9053 Piston Gp
| 2W***53 | Piston Group | 1 |
819982 Power Pack Gp-Part 2 0f 4
| 08***82 | Power Pack Group | 1 |
819982 Power Pack Gp
| 08***82 | Power Pack Group | 1 |
| 08***94 | Drive Group-Fan | 1 |
| 08***24 | Exhaust Group | 1 |
819982 Power Pack Gp-Part 1 Of 4
| 08***82 | Power Pack Group | 1 |
819982 Power Pack Gp-Part 4 Of 4
| 08***82 | Power Pack Group | 1 |
819982 Power Pack Gp-Part 3 Of 4
| 08***82 | Power Pack Group | 1 |
7x4429 Take-Off Gp
| 7X***29 | Power Take-Off Group; Take-Off-Gp | 1 |
4n1717 Rocker Arm Gp
| 4N***17 | Rocker Arm Group | 1 |
7w5926 Arm Gp-Valve Rocker
| 7W***26 | Rocker Arm Group; -Front, Rh; Rear, Lh | 1 |
7w5927 Arm Gp-Valve Rocker
| 7W***27 | Rocker Arm Group; -Rear, Rh; Front, Lh | 1 |
6n6499 Support Gp-Front Engine
| 6N***99 | Support Group-Engine; Engine Support Group-Front | 1 |
7n9078 Support Gp-Engine
| 7N***78 | Support Group-Engine; -Front, Wide | 1 |
4n7352 Valve Mechanism Gp
| 4N***52 | Valve Mechanism Group; Mechanism Group-Valve | 1 |
Console/Panel
820037 Console & Control Gp-Part 3 Of 3
| 08***37 | Console & Control Group | 1 |
820037 Console & Control Gp-Part 2 Of 3
| 08***37 | Console & Control Group | 1 |
820037 Console & Control Gp-Part 1 Of 3
| 08***37 | Console & Control Group | 1 |
0871854 Installation Kit-Part 1 Of 2
| 08***54 | Kit-Installation | 1 |
0871854 Installation Kit-Part 2 Of 2
| 08***54 | Kit-Installation | 1 |
820039 Panel Gp-Instrument
| 08***39 | Panel Group-Instrument | 1 |
Conveyor
820083 Conveyor Gp-Lower
| 08***83 | Conveyor Group-Lower | 1 |
820094 Conveyor Gp-Upper
| 08***94 | Conveyor Group-Upper | 1 |
7x5079 Cover Gp-Conveyor
| 7X***79 | Cover Group | 1 |
820195 Flashing Gp-Upper Conveyor
| 08***95 | Flashing Group-Upper Conveyor | 1 |
820082 Support Gp-Lower Conveyor
| 08***82 | Hanger Group | 1 |
820095 Support Gp-Upper Conveyor
| 08***95 | Hanger Group | 1 |
7r2897 Lube Gp-Conveyor Swing Pivot
| 7R***97 | Lube Group-Conveyor Swing Pivot | 1 |
Cooling System
4n8099 Aftercooler Gp-Water
| 4N***99 | Aftercooler Group-Water | 1 |
4n2388 Cooler Gp-Engine Oil
| 4N***88 | Cooler Group-Engine Oil; Engine Oil Cooler Group | 1 |
5n5742 Cover Gp-Water Outlet Orificed
| 5N***42 | Cover Group-Water Outlet; Cover Gp-Water Outlet Orificed | 1 |
8n0021 Filter Gp-Coolant
| 8N***21 | Filter Group-Coolant; -Dual Element | 1 |
1016018 Lines Gp-Water
| 10***18 | Lines Group-Water | 1 |
4n2452 Lines Gp-Water
| 4N***52 | Lines Group-Water | 1 |
6n1898 Lines Gp-Water Aftercooler
| 6N***98 | Lines Group-Water; Lines Group-Water (Aftercooler) | 1 |
1050196 Pump Gp-Water
| 10***96 | Pump Group-Water | 1 |
4n5837 Pump Gp-Water
| 4N***37 | Pump Group-Water; Pump Group-Water | 1 |
4n7657 Pump Gp-Water*R
| 4N***57 | Pump Group-Water; Pump Gp-Water (4n***37 N/S) | 1 |
1341487 Pump Gp-Water
| 13***87 | Pump Group-Water | 1 |
7r7501 Cooling Gp-Supplemental
| 7R***01 | Radiator Group | 1 |
Cutter
9n8226 Clutch As
| 9N***26 | Clutch As | 1 |
7r2892 Cutter Ar
| 08***25 | End As-Bearing | 1 |
| 08***17 | End Group-Cutter Drive | 1 |
| 08***85 | Housing Group-Rotor; Housing Gp-Cutter | 1 |
7x8345 Drive Gp-Auxiliary
| 7X***45 | Drive Group-Auxiliary Cutter | 1 |
9n9047 Drive Gp-Lower Cutter
| 9N***47 | Drive Group-Lower Cutter | 1 |
816925 End As-Bearing
| 08***25 | End As-Bearing | 1 |
7x8335 End Gp-Cutter Drive-Part 2 Of 3
| 7X***35 | End Group-Cutter Drive | 1 |
7x8335 End Gp-Cutter Drive-Part 3 Of 3
| 7X***35 | End Group-Cutter Drive | 1 |
817517 End Gp-Cutter Drive-Part 2 Of 3
| 08***17 | End Group-Cutter Drive | 1 |
817517 End Gp-Cutter Drive-Part 1 Of 3
| 08***17 | End Group-Cutter Drive | 1 |
817517 End Gp-Cutter Drive-Part 3 Of 3
| 08***17 | End Group-Cutter Drive | 1 |
7x8335 End Gp-Cutter Drive-Part 1 Of 3
| 7X***35 | End Group-Cutter Drive | 1 |
870439 Extension Gp-Lh Cutter
| 08***39 | Extension Group-Cutter | 1 |
819936 Housing Gp-Cutter
| 08***36 | Housing Group-Cutter | 1 |
817785 Housing Gp-Cutter
| 08***85 | Housing Group-Rotor; Housing Gp-Cutter | 1 |
8t6299 Torque Hub As
| 8T***99 | Hub As-Torque | 1 |
9n8205 Drive Line As
| 9N***05 | Line As-Drive; Drive Line As | 1 |
819957 Mounting Gp-Auxiliary Drive Motor
| 08***57 | Mounting Group-Auxiliary Drive Motor | 1 |
8t6315 Extension Gp-Lh Cutter
| 8T***15 | Rotor Group-Extension-Lh | 1 |
8t6316 Extension Gp-Rh Cutter
| 8T***16 | Rotor Group-Extension-Rh | 1 |
870916 Extension Gp-Rh Cutter
| 08***16 | Rotor Group-Extension-Rh | 1 |
819958 Tension Gp-Belt
| 08***58 | Tensioner Group-Belt | 1 |
1c4831 Valve As
| 1C***31 | Valve As | 1 |
Engine Arrangement
1230204 Engine Ar-Part 1 Of 2
| 10***23 | Damper Group | 1 |
| 12***04 | Engine Ar | 1 |
| 2W***37 | Filler Group-Oil | 1 |
7w7541 Engine Ar-Part 2 Of 2
| 2W***65 | Lines Group-Fuel Injection; Lines Group-Fuel Injection | 1 |
| 2W***54 | Piston & Rod Group; Connecting Rod & Piston Group | 12 |
| 3N***90 | Plate Serial Number; On R.H. Rear Bank Of Cylinder Block As Viewed From Rear Of Engine | 1 |
7w7541 Engine Ar-Part 1 Of 2
| 2N***20 | Breather Group; Breather Gp-Crankcase | 2 |
| 2W***37 | Filler Group-Oil | 1 |
| 4N***22 | Crankshaft Group; Crankshaft Group | 1 |
9e1814 Engine Ar
| 3N***41 | Control Group-Governor | 1 |
| 4W***65 | Damper Group | 1 |
| 5N***42 | Cover Group-Water Outlet; Cover Gp-Water Outlet Orificed | 1 |
1230204 Engine Ar-Part 2 Of 2
| 10***18 | Lines Group-Water | 1 |
| 12***04 | Engine Ar | 1 |
| 2W***65 | Lines Group-Fuel Injection; Lines Group-Fuel Injection | 1 |
Frame
819905 Air-Box Gp
| 08***05 | Box Group-Air | 1 |
870551 Console Gp-Rear
| 08***51 | Console Group | 1 |
870550 Console Gp-Front-Part 1 Of 3
| 08***50 | Console Group | 1 |
870550 Console Gp-Front-Part 2 Of 3
| 08***50 | Console Group | 1 |
819901 Main-Frame Gp-Part 1 Of 2
| 08***01 | Frame Group-Main | 1 |
819901 Main-Frame Gp-Part 2 Of 2
| 08***01 | Frame Group-Main | 1 |
8t4037 Mount As-Adjustable Sensor
| 8T***37 | Mount As-Sensor | 1 |
820812 Scale Gp-Front Deck
| 08***12 | Scale Group-Deck; (Front Deck) | 1 |
7x4438 Scale Gp-Rear Deck
| 7X***38 | Scale Group-Deck | 1 |
1c4209 Mounting As-Sensor
| 1C***09 | Sensor Group | 1 |
8t6314 Ski Gp-Averaging
| 8T***14 | Ski Group-Averaging | 1 |
820688 Stop As-Mainframe
| 08***88 | Stop As-Main Frame | 1 |
819902 Tank Gp-Fuel/Hydraulic Oil
| 08***02 | Tank Group-Hydraulic & Fuel | 1 |
819903 Tank Gp-Water
| 08***03 | Tank Group-Water | 1 |
7x4431 Wheel Gp-Grade Sensing
| 7X***31 | Wheel Group-Sensor | 1 |
Fuel System And Governor
3n7741 Control Gp-Governor
| 3N***41 | Control Group-Governor | 1 |
6n3195 Drive Gp-Governor & Fuel Pump
| 6N***95 | Drive Group-Governor & Fuel Pump; Governor & Fuel Injection Pump Drive Group | 1 |
6n8791 Drive Gp-Tachometer-Single
| 6N***91 | Drive Group-Tachometer; Drive Gp-Tachometer-Single | 1 |
9y3336 Fastener Gp
| 9Y***36 | Fastener Group-Governor | 1 |
8h7204 Filter Gp-Fuel
| 8H***04 | Filter Group-Fuel | 1 |
4n6925 Filter Gp-Fuel
| 4N***25 | Filter Group-Fuel; Filter Group-Fuel | 1 |
820030 Fuel System
| 08***30 | Fuel System Group | 1 |
6n8882 Gauge Gp-Fuel Pressure
| 6N***82 | Gauge Group-Fuel Pressure | 1 |
4w6013 Governor Gp-Part 2 Of 2
| 4W***13 | Governor Group | 1 |
4w6013 Governor Gp-Part 1 Of 2
| 4W***13 | Governor Group | 1 |
7n6124 Housing As-Pump
| 7N***24 | Housing As-Fuel Pump | 1 |
7r6921 Lines Gp-Fuel
| 7R***21 | Lines Group-Fuel | 1 |
7w1077 Lines Gp-Fuel Filter
| 7W***77 | Lines Group-Fuel Filter; Fuel Filter Lines Group | 1 |
6i0349 Lines Gp-Fuel Injection
| 6I***49 | Lines Group-Fuel Injection | 1 |
7c6299 Lines Gp-Fuel Injection
| 7C***99 | Lines Group-Fuel Injection | 1 |
2w8065 Lines Gp-Fuel Injection
| 2W***65 | Lines Group-Fuel Injection; Lines Group-Fuel Injection | 1 |
6i0350 Lines Gp-Fuel Injection
| 6I***50 | Lines Group-Fuel Injection | 1 |
7c6300 Lines Gp-Fuel Injection
| 7C***00 | Lines Group-Fuel Injection | 1 |
4n2328 Meter Gp-Service
| 4N***28 | Meter Group-Service; Meter Group-Service | 1 |
4w7018 Nozzle As-Fuel Valve*R
| 4W***18 | Nozzle As-Fuel Valve | 1 |
6n1947 Piston Gp-Governor Servo
| 6N***47 | Piston Group-Governor Servo | 1 |
4w7374 Plate Gp-Governor Adapter
| 4W***74 | Plate Group-Governor Adapter | 1 |
7w0561 Pump Gp-Fuel Injection
| 7W***61 | Pump Group-Fuel Injection | 1 |
4w6068 Pump Gp-Fuel Injection-Part 2 Of 2
| 4W***68 | Pump Group-Fuel Injection | 1 |
4w6068 Pump Gp-Fuel Injection-Part 1 Of 2
| 4W***68 | Pump Group-Fuel Injection | 1 |
4w0101 Pump Gp-Fuel Injection
| 4W***01 | Pump Group-Fuel Injection | 1 |
4n3287 Pump Gp-Fuel Priming
| 4N***87 | Pump Group-Fuel Priming; Pump Group-Fuel Priming | 1 |
4w5477 Pump Gp-Fuel Transfer
| 4W***77 | Pump Group-Fuel Transfer | 1 |
4n1101 Pump Gp-Fuel Transfer
| 4N***01 | Pump Group-Fuel Transfer | 1 |
4w6069 Pump Gp-Governor, Fuel Injection & Fuel Transfer
| 4W***69 | Pump Group-Gov, Fuel Inj & Tfr | 1 |
4w8929 Governor, Fuel Injection, Fuel Transfer Pump Gp
| 4W***29 | Pump Group-Gov, Fuel Inj & Tfr; Governor, Fuel Inj. & Fuel Tfr. Pump Group | 1 |
4n4267 Torque Control Gp
| 4N***67 | Torque Control Group; Governor Torque Spring Group | 1 |
Hydraulic System
8c0338 Brake As-Hydraulic
| 8C***38 | Brake As-Hydraulic | 1 |
7x8346 Control Gp-Automatic Elevation Hydraulic-Part 1 Of 2
| 7X***46 | Control Group-Automatic Elv Hydraulic | 1 |
7x8346 Control Gp-Automatic Elevation Hydraulic-Part 2 Of 2
| 7X***46 | Control Group-Automatic Elv Hydraulic | 1 |
8c9471 Control Gp-Conveyor Swing
| 03***47 | Elbow-Filtered Fuel From Based Assembly | 2 |
| 03***56 | Elbow; (90 Degree) | 1 |
| 06***58 | Tee Hose Assembly To | 2 |
7x5078 Control Gp-Cross Slope
| 03***47 | Elbow-Filtered Fuel From Based Assembly | 13 |
| 06***58 | Tee Hose Assembly To | 3 |
| 07***40 | Locking--V | 2 |
7x8338 Control Gp-Pressure & Return
| 7X***38 | Control Group-Press & Return | 1 |
7r2894 Control Gp-Upper Conveyor Hydraulic-Elevation & Swing
| 7R***94 | Control Group-Upper Conveyor Hydraulic | 1 |
8t5540 Cylinder As-Hydraulic
| 8T***40 | Cylinder As-Hydraulic | 1 |
8c9479 Cylinder As-Hydraulic
| 8C***79 | Cylinder As-Hydraulic | 1 |
7r0389 Cylinder As-Hydraulic
| 7R***89 | Cylinder As-Hydraulic | 1 |
8c0447 Cylinder Gp-Hydraulic
| 8C***47 | Cylinder Group-Hydraulic | 1 |
8c9493 Cylinder Gp-Hydraulic
| 8C***93 | Cylinder Group-Hydraulic; -Track Tension | 1 |
8c9476 Cylinder-Hydraulic
| 8C***76 | Cylinder-Hydraulic | 1 |
817895 Hydraulic As-Cutter Door-Part 1 0f 2
| 08***95 | Hydraulic As-Cutter Door | 1 |
817895 Hydraulic As-Cutter Door-Part 2 0f 2
| 08***95 | Hydraulic As-Cutter Door | 1 |
821019 Hydraulic System-Lower Conveyor Controls
| 08***19 | Hydraulic Group-Conveyor Cntrl | 1 |
7x8342 Hydraulic Gp-Upper Conveyor Drive
| 7X***42 | Hydraulic Group-Conveyor Drive | 1 |
7x8341 Hydraulic Gp-Lower Conveyor Drive
| 7X***41 | Hydraulic Group-Conveyor Drive | 1 |
7r2895 Hydraulic Gp-Cutter Door (Components)
| 7R***95 | Hydraulic Group-Cutter Door | 1 |
7x8343 Hydraulic Gp-Cutter Moldboard
| 7X***43 | Hydraulic Group-Cutter Moldboard | 1 |
7x8303 Hydraulic System-Manual Elevation-Part 1 Of 2
| 7X***03 | Hydraulic Group-Elevation | 1 |
7x8303 Hydraulic System-Manual Elevation-Part 2 Of 2
| 7X***03 | Hydraulic Group-Elevation | 1 |
7x8337 Hydraulic Gp-Ground Drive-Part 2 0f 2
| 7X***37 | Hydraulic Group-Ground Drive | 1 |
7x8337 Hydraulic Gp-Ground Drive-Part 1 Of 2
| 7X***37 | Hydraulic Group-Ground Drive | 1 |
7x8336 Hydraulic Gp-Oil Tank
| 7X***36 | Hydraulic Group-Oil Tank | 1 |
821002 Hydraulic System-Upper Conveyor Elevation
| 08***02 | Hydraulic Group-Upper Convyr Elv; Hydraulic System-Upper Conveyor Elevator | 1 |
820983 Hydraulic System-Upper Conveyor Swing Control
| 08***83 | Hydraulic Group-Upper Convyr Swg; Hydraulic System-Upper Conveyor Swing | 1 |
7r4830 Lines Gp-Cutter Door
| 7R***30 | Lines Group-Cutter Door | 1 |
6r1647 Lines Gp-Cylinder
| 6R***47 | Lines Group-Cylinder | 1 |
7r3010 Lines Gp-Upper Conveyor-Elevation & Swing
| 7R***10 | Lines Group-Upper Conveyor | 1 |
8t6269 Motor Gp-Hydraulic
| 8T***69 | Motor Group-Hydraulic | 1 |
8c1842 Valve As
| 8C***42 | Pendulum As | 1 |
9n8963 Pendulum As
| 9N***63 | Pendulum Group | 1 |
7x8339 Pump & Control Gp-Conveyor
| 7X***39 | Pump & Control Group-Conveyor | 1 |
8t3951 Sensor As
| 8T***51 | Sensor As | 1 |
7x8300 Hydraulic System-Manual Steering
| 7X***00 | Steering Ar | 1 |
8t4047 Valve As-Cylinder Lock
| 8T***47 | Valve As-Cylinder Lock | 1 |
8c0769 Valve Gp
| 8C***69 | Valve Group; (Hydraulic) | 1 |
9n7885 Valve Gp
| 9N***85 | Valve Group | 1 |
Intake And Exhaust System
7r7500 Intake Gp-Air
| 7R***00 | Air Cleaner Group | 1 |
6n6078 Air Cleaner Gp
| 6N***78 | Air Cleaner Group | 1 |
7n6331 Air Cleaner Gp-2 Required
| 7N***31 | Air Cleaner Group | 1 |
9n3676 Cartridge Gp-Turbocharger*R
| 9N***76 | Cartridge Group-Turbocharger | 1 |
820025 Cover Gp-Turbocharger
| 08***25 | Cover Group-Turbocharger | 1 |
820004 Mounting & Drive Gp-Air Compressor
| 08***04 | Drive Group-Air Compressor | 1 |
820024 Exhaust Gp
| 08***24 | Exhaust Group | 1 |
4w7649 Lines Gp-Air
| 4W***49 | Lines Group-Air | 1 |
820002 Lines Gp-Air Compressor
| 08***02 | Lines Group-Air Compressor | 1 |
4n2934 Lines Gp-Turbocharger Oil
| 4N***34 | Lines Group-Turbocharger Oil | 1 |
8n8925 Manifold Gp-Exhaust
| 8N***25 | Manifold Group-Exhaust; Exhaust Manifold Group | 1 |
6n9091 Shield Gp-Manifold Heat
| 6N***91 | Shield Group-Manifold; -Exhaust Manifold | 1 |
4w7500 Turbocharger Gp
| 4W***00 | Turbocharger Group | 1 |
4w7648 Turbocharger Gp
| 4W***48 | Turbocharger Group | 1 |
Lubrication System
2n8220 Breather Gp-Crankcase
| 2N***20 | Breather Group; Breather Gp-Crankcase | 1 |
9y2989 Breather Gp
| 9Y***89 | Breather Group | 1 |
4n2481 Fastener Gp-Oil Pump Mounting
| 4N***81 | Fastener Group-Oil Pump Mounting; Oil Pump Mounting Fastener Group | 1 |
2w6537 Filler Gp-Engine Oil
| 2W***37 | Filler Group-Oil | 1 |
4n2387 Filter Gp-Engine Oil
| 4N***87 | Filter Group-Engine Oil | 1 |
6n7305 Fumes Disposal Gp
| 6N***05 | Fumes Disposal Group | 1 |
7w5292 Gauge Gp-Oil Level (Dipstick)
| 7W***92 | Gauge Group-Oil Level (Dipstick) | 1 |
8n3037 Lines Gp-Engine Oil
| 8N***37 | Lines Group-Engine Oil | 1 |
6n1030 Pump Gp-Engine Oil
| 6N***30 | Pump Group-Engine Oil; Engine Oil Pump Group | 1 |
Pavement Profiler
Pr-750
| 8T***18 | General Ar | 1 |
Power Train
817108 Gear-Box Gp-2 Pump Drive
| 08***08 | Gear Group-Transfer | 1 |
8c7017 Torque Hub As
| 8C***17 | Hub As-Torque | 1 |
9p7783 Roller Gp-Single Flange
| 9P***83 | Roller Group-Single Flange; Track Roller Group-Single Flange | 1 |
6k9879 Roller Gp-Track Carrier
| 6K***79 | Roller Group-Track Carrier; Track Carrier Roller Group | 1 |
820036 Track Gp
| 08***36 | Track Group | 1 |
820763 Track As
| 08***63 | Track Group; (Front & Right Rear) | 1 |
820762 Track As
| 08***62 | Track Group | 1 |
Service Equipment And Supplies
820038 Decal & I.D. Plate Gp-Part 1 Of 3
| 08***38 | Plate & Film Group | 1 |
820038 Decal & I.D. Plate Gp-Part 3 Of 3
| 08***38 | Plate & Film Group | 1 |
820038 Decal & I.D. Plate Gp-Part 2 Of 3
| 08***38 | Plate & Film Group | 1 |
819929 Shipping Gp
| 08***29 | Shipping Group | 1 |
7x3749 Shipping Gp-Conveyor
| 7X***49 | Shipping Group-Conveyor | 1 |
Starting And Electrical System
4n3986 Alternator Gp-Part 2 Of 2*R
| 4N***86 | Alternator Group-Charging; (24-Volt, 60-Ampere)(24-Volt, 60-Ampere) | 1 |
4n3986 Alternator Gp-Part 1 Of 2*R
| 4N***86 | Alternator Group-Charging; (24-Volt, 60-Ampere)(24-Volt, 60-Ampere) | 1 |
820224 Electrical Gp-Part 3 Of 3
| 08***24 | Electrical Group | 1 |
820224 Electrical Gp-Part 2 Of 3
| 08***24 | Electrical Group | 1 |
820224 Electrical Gp-Part 1 Of 3
| 08***24 | Electrical Group | 1 |
820003 Mounting Gp-Alternator
| 08***03 | Mounting Group-Alternator | 1 |
6n8191 Mounting Gp-Alternator
| 6N***91 | Mounting Group-Alternator | 1 |
4p0303 Shutoff Gp-Electrical
| 4P***03 | Shutoff Group-Electrical; Shut-Off Gp-Electrical | 1 |
3t3421 Solenoid As
| 3T***21 | Solenoid As | 1 |
3t8635 Solenoid As
| 3T***35 | Solenoid As | 1 |
7t8854 Solenoid As-Starting Motor
| 7T***54 | Solenoid As-Starting Motor | 1 |
9g5584 Starting Motor Gp-Electric-Part 2 Of 2
| 9G***84 | Starting Motor Group-Electric | 1 |
9x4452 Starting Motor Gp-Electric
| 9X***52 | Starting Motor Group-Electric; Electric Starting Motor Group (Nippondenso) | 1 |
3t2649 Starting Motor Gp-Electric-Part 3 Of 3
| 3T***49 | Starting Motor Group-Electric | 1 |
3t2650 Starting Motor Gp-Electric
| 3T***50 | Starting Motor Group-Electric | 1 |
| 6N***89 | Starting Motor Group-Electric | 1 |
| 7T***95 | Starting Motor Group-Electric; Starting Motor Group-Electric | 1 |
7t0794 Starting Motor Gp-Electric
| 7T***94 | Starting Motor Group-Electric | 1 |
7t0795 Starting Motor Gp-Electric
| 7T***95 | Starting Motor Group-Electric; Starting Motor Group-Electric | 1 |
9g5584 Starting Motor Gp-Electric-Part 1 Of 2
| 9G***84 | Starting Motor Group-Electric | 1 |
1068554 Starting Motor Gp-Electric
| 10***54 | Starting Motor Group-Electric; (Delco Remy) | 1 |
3t2649 Starting Motor Gp-Electric-Part 1 Of 3
| 3T***49 | Starting Motor Group-Electric | 1 |
6v5582 Starting Motor Gp-Electric
| 6V***82 | Starting Motor Group-Electric; (Nippondenso) | 1 |
3t2649 Starting Motor Gp-Electric-Part 2 Of 3
| 3T***49 | Starting Motor Group-Electric | 1 |
8c3644 Starting Motor Gp-Electric
| 8C***44 | Starting Motor Group-Electric; Starting Motor Gp - Electric | 1 |
6v5540 Starting Motor Gp-Electric
| 6V***40 | Starting Motor Group-Electric; (Robert Bosch) | 1 |
6v5539 Starting Motor Gp-Electric*R
| 10***54 | Starting Motor Group-Electric; (Delco Remy) | 1 |
| 6V***39 | Starting Motor Group-Electric; (24-Volt) | 1 |
| 6V***40 | Starting Motor Group-Electric; (Robert Bosch) | 1 |
8c3649 Starting Motor Gp-Electric
| 8C***49 | Starting Motor Group-Electric | 1 |
6n1889 Starting Motor Gp-Electric*R
| 3T***49 | Starting Motor Group-Electric | 1 |
| 6N***89 | Starting Motor Group-Electric | 1 |
| 7T***94 | Starting Motor Group-Electric | 1 |
Steering
819893 Indicator As-Steering
| 08***93 | Indicator As-Steering | 1 |
819933 Leg Gp
| 08***33 | Leg Group | 1 |
Water Spray System
8c0880 Motor Gp-Hydraulic
| 8C***80 | Motor Group-Hydraulic | 1 |
8t4046 Pump Gp-Water
| 8T***46 | Pump Group-Water | 1 |
820830 Spray As-Roller
| 08***30 | Spray As-Roller | 1 |
820064 Spray Gp-Water (Propelling)
| 08***64 | Spray Group-Water | 1 |
820067 Spray Gp-Water (Lower Conveyor)
| 08***67 | Spray Group-Water | 1 |
817797 Spray Gp-Water
| 08***97 | Spray Group-Water | 1 |
820821 Water Gp-High Pressure
| 08***21 | Water Group-High Pressure | 1 |
PR-750B serial number reference
On the PR-750B the PIN plate is riveted to the main frame, usually on the left side near the operator platform or engine enclosure. Read the first three characters of the 8-character serial (or the corresponding segment of a 17-character PIN) as the prefix — it identifies the model/build series, and the remaining digits are the sequential unit number in production order.
| Prefix | Identifies | Notes |
|---|---|---|
| 8AC | PR-750B cold planer (base machine) | Only verified prefix for the PR-750B. Machine runs a 3412 V12 diesel rated around 750 gross hp, matching the model-name convention used across Cat's original PR-series planers (PR-75, PR-105, PR-275, PR-450, PR-750B). Operating weight lands near 42,600 kg (94,000 lb), with a 3.05 m (10 ft) cutting width and 25.4 cm (10 in) max depth. No PR-750 (non-B) or PR-750C variant exists, so there is no predecessor/successor prefix to confuse this with. Not listed in general serial-prefix references — confirm with your dealer before final use. |
Frequently asked questions
What engine does the Caterpillar PR-750B cold planer use?
A Cat 3412 V12 diesel, mechanically governed and turbocharged for this power class, rated at roughly 559 kW (750 hp) gross.
What is the operating weight of the Caterpillar PR-750B?
About 42,638 kg (94,001 lb) at full load. This varies by configuration, such as water tank fill level and conveyor or spray-bar options fitted.
What replaced the Caterpillar PR-750B?
No single documented direct successor exists. It belongs to Caterpillar's original CMI-built PR-series cold planers; the range later moved through the PR-1000/PR-1000C class and eventually to the modern PM-series cold planers.
What PR-750B owners discuss
What engine is actually in the PR-750B, and what quirks come with it?
The PR-750B runs a Cat 3412, a mechanically governed V-12 rated at roughly 750 gross hp (559 kW). This is the pre-electronic 3412 with mechanical unit injection, not the later HEUI-equipped 3412E, so there is no ECM to fault-code — diagnosis is mechanical: fuel filters, injection pump timing, and nozzle condition. Nozzle tips erode and enlarge with hours, which shows up first as extra smoke and softer throttle response, well before the engine actually misfires. Cold starts can be slow to build oil temperature and idle unevenly until warm; that alone is normal for this vintage of mechanical V-12, not a fault. Persistent rough running once fully warm points to a stuck injection pump rack, uneven injector wear across cylinders, or contaminated fuel — have your dealer verify before committing to an in-frame rebuild.
What's the undercarriage setup, and how does it wear in real use?
The PR-750B rides on a three-track arrangement — two rear crawler tracks plus a front oscillating track — with 45.7 cm (18 in) wide track shoes front and rear (varies by configuration/series across the PR line). Because this machine spends its life crawling over freshly milled asphalt and aggregate, the abrasive spoil wears sprockets and rollers faster than dirt-moving equipment of similar size and weight. Track tension needs checking cold, first thing in the morning, since rubber and steel expand once the tracks warm up and a tension check taken hot reads tighter than it really is, encouraging over-tensioning. Sprocket teeth that look hooked or pointed instead of round are the earliest visible sign that undercarriage replacement needs to be planned rather than waited out.
Are there known hydraulic/propel quirks on machines this size and age?
Rotor drive and track propel on machines in this class are hydrostatic, and owners of similar-era, similar-size Cat tracked equipment consistently report one pattern: sluggish or weak propel when the machine is cold, or after it has been running hot, traced to a worn pump swashplate or backing surface, or a tired charge pump, rather than the main pump itself. On a PR-750B, sluggish rotor-height response or one track lagging under load is worth checking at charge pressure and pilot supply before condemning the main pump. This is gauge-and-pressure-test territory, not a guess-by-feel job — have your dealer verify with proper pressure testing.
What electrical/sensor issues come up with the grade control system?
Cat's sonic grade and slope control on these planers uses averaging sensors mounted along the side of the machine, and the factory setup guidance is explicit about interference: an unused sensor left powered near an active one, or a folded-up sensor beam sitting in the same zone as another, injects noise into the signal and makes the machine hunt instead of holding a smooth line. A sensor mounted behind the machine's centerline will also give bad readings by design, independent of any fault. If a machine is drifting off grade intermittently rather than steadily, sensor wiring and mounting position are the first things to check, ahead of the rotor height cylinders themselves.
What wears out on the cutting drum, and what should an owner watch for?
Tooth holders take the brunt of milling wear, not just the carbide cutting tips — a holder with a rounded or worn pocket lets the tool wander and chatter even with a fresh tip installed, so holders get replaced on their own schedule separate from the tips. Cracked drum housing castings are a recognized wear item on machines of this size and age; a dye-penetrant or magnetic-particle check on the housing is worth doing rather than relying on a visual-only look, since hairline cracks in cast housings don't always show under normal shop light. Discharge conveyor belts also wear from the abrasive milled material passing over them continuously — edge fraying and cover wear near the tail pulley show up well before the belt actually fails.
Does the water spray system or conveyor cause recurring headaches?
The water spray system used for dust suppression and drum cooling clogs at the nozzles from mineral buildup and rock fines faster than most owners expect, especially if the machine draws from anything but clean water. A partially clogged nozzle bank shows up as uneven cooling or visible dust well before any flow gauge shows a drop, so nozzles are worth a physical check on a set interval rather than waiting for a symptom. Discharge conveyor wear follows the same abrasive-material pattern as the drum housing — inspect belt edges and covers regularly rather than waiting for a tear.
What should I check before buying a used PR-750B?
Insist on a functional rotor height-adjustment test with the hydraulic system under load, not just a static walkaround — pump and cylinder performance only reveals itself when the drum is actually being raised and lowered. Check remaining undercarriage life independently of the hours shown on the meter, since engine hour meters on machines this old have sometimes been replaced and don't reliably reflect true service life. Inspect the drum housing and moldboard for cracks, confirm the grade/slope sensors and their wiring are actually functional rather than just physically present, and check the conveyor and exterior sheet metal for the abrasive wear patterns typical of this machine class. Given the age of this model, expect thin factory documentation on the exact unit and budget for a dealer inspection with a hydraulic pressure test on the main circuits before committing to a purchase — have your dealer verify overall mechanical condition first.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific PR-750B part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.