Caterpillarpaving compactorvibratory compactor
Caterpillar CP-433B
Maintenance schedule, common problems & OEM parts breakdown
The Cat CP-433B is a single-drum vibratory soil compactor: an articulated, rigid-drum roller with a steel padfoot drum up front and a rubber-tired, NoSPIN differential-driven rear axle. Caterpillar built the B-series from the late 1980s into the mid-1990s, powered by a Perkins T4.236 turbocharged 4-cylinder diesel rated at roughly 76 kW (102 hp) gross. Operating weight runs about 6.7 t (14,700 lb) in base trim, edging up toward 6.9 t (15,225 lb) on heavier-equipped units, and figures vary by configuration/series. The drum measures roughly 1220 mm diameter by 1680 mm width. Caterpillar offered the line in a padfoot version (CP-433B) and a smooth-drum version (CS-433B), plus a narrower CS-431B variant, all sharing the same hydrostatic direct-drive propel and vibratory system with a high/low amplitude selector. The B-series sits between the original 433 rollers and the Cat 3054-powered CP-433C that followed it in the late 1990s.
Across the 433 family, the biggest change came after the B-series: Caterpillar swapped the Perkins T4.236 for its own 3054T diesel in the C-series, then added an electronic vibratory control module and the 3054C engine in the CP-433E/CS-423E-CS-433E generation, giving later machines electronic amplitude switching and engine management the B-series never had. The CP-433B predates all of that: its vibratory system is purely hydrostatic and mechanically controlled, and its rear differential is a sealed oil-bath NoSPIN unit that needs no special adjustment. That simplicity is exactly why the B-series still circulates in the used and parts market today. Fleets and independent contractors buying older compaction iron favor it for having fewer electronic failure points, a driveline shared across the wider Cat B-series compactor lineup, and a straightforward Perkins-based powertrain that independent diesel shops can service without proprietary diagnostics.
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 CP-433B specifications
Engine
| Engine model | Perkins T4.236 turbocharged diesel (4-cylinder, 4.236 series) |
| Gross power | 76 kW (102 hp) |
| Displacement | 3.9 L (236.2 cu in) |
| Cylinders | 4, in-line |
| Emissions tier | Not published for this model (pre-emissions-tier era build) |
Weights
| Operating weight | 6,670-6,700 kg (14,700 lb / 6.7 tons) |
| Shipping weight | Not published — same as operating weight figure in available literature |
| Static linear (line) load | 18 kg/cm |
Dimensions
| Transport length | 4.86-5.34 m (15 ft 11 in - 17 ft 6 in), varies by configuration/source (with or without blade/drawbar) |
| Transport width | 1.8-1.91 m (5 ft 11 in - 6 ft 3 in), varies by source |
| Transport height | 2.93-3.05 m (9 ft 7 in - 10 ft 0 in), varies by source |
| Drum diameter | 1.22 m (48.0 in) |
| Drum width | 1.67-1.68 m (65.7-66.2 in) |
| Ground clearance | Not published |
| Wheelbase / track gauge | Not published |
Performance
| Travel speed (max) | 12-13.3 km/h (7.5-8.3 mph), varies by source |
| Outside turning radius | 4.73 m (15 ft 6 in) |
| Inside turning radius | 3.05 m (10 ft 0 in) |
| Vibration frequency | 29.5-32 Hz, varies by source/configuration |
| Centrifugal force | 97-134 kN, varies by amplitude setting (high/low) and source |
| Gradeability | Not published |
Service capacities (summary)
| Fuel tank | 144 L (38.1 gal) |
| Hydraulic system | 144 L (38.1 gal) |
| Engine oil | 7.7 L (2.1 gal) |
| Cooling system | Not published |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
CP-433B fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | 7.7-8.0 L (2.1 US gal) | Cat DEO diesel engine oil, API CF-4/CG-4 level. SAE 15W-40 for general/warm-climate operation, SAE 10W-30 where cold starts are common. Engine is the T4.236 turbocharged 4-cylinder diesel used across this compactor family. |
| Cooling system | Not published in available specification sources for this model - OMM Coolant, Fuel and Lubricant Specifications section covers it; confirm exact liters with dealer before a full drain-and-fill. | Cat ELC (Extended Life Coolant) or an equivalent heavy-duty ethylene-glycol antifreeze/coolant per Cat's standard machine coolant specification. |
| Fuel tank | 144 L (38.1 US gal) | No. 2-D diesel fuel for normal operation; No. 1-D diesel recommended for cold-weather starting. |
| Hydraulic system (including tank) | 144 L (38.1 US gal) - same figure as the fuel tank in the spec data reviewed; treat as approximate and verify by serial/configuration. | Cat HYDO hydraulic oil (or equivalent anti-wear hydraulic fluid). Heavier viscosity grade for sustained hot-climate operation, lighter multigrade where cold starts occur. |
| Rear axle / differential (oil-bath, NoSPIN unit) | Not documented in available specification sources - verify fill quantity with the OMM or dealer. | Cat TDTO (Transmission/Drive Train Oil), multigrade SAE 10W/30/50 range selected by ambient temperature; axle uses a single low-speed seal design to extend service intervals. |
| Grease points (chassis/drum lubrication, spec only) | Four grease points on the machine, serviced on a 50-hour interval - not a fill-volume item. | NLGI 2 multipurpose grease (Cat MPGM-type multipurpose grease). |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar CP-433B 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 CP-433B beyond the schedule
Predictive Maintenance & Fluid Analysis on the CP-433B
Sample engine oil from the Perkins T4.236, hydrostatic propel/vibratory oil, and NoSPIN differential oil bath at every scheduled interval. Watch hydrostatic samples for iron and bronze wear metal trending up, a leading sign of pump or motor wear before it shows as sluggish propel or weak amplitude. Track coolant conditioner concentration to protect the wet-liner block. Monitor turbocharger oil for soot and silicon indicating air intake or seal issues.
Corrective & Common Repairs on the CP-433B
Typical failures center on drum bearing seal leaks, worn scraper bars, and hydrostatic pump or motor wear that shows up as amplitude falling off the high/low spec. The Perkins T4.236 turbocharger is vulnerable to oil starvation on machines with deferred oil changes. Articulation pins and bushings wear from constant steering loads on compaction passes. NoSPIN differential noise usually traces to a low or contaminated oil-bath level rather than the unit itself.
Overhaul & Rebuild Points on the CP-433B
At high hours, expect drum shell and padfoot tip wear requiring re-shoeing or weld repair, and vibratory exciter bearing and eccentric weight shaft wear inside the drum housing. Hydrostatic pump and motor rebuilds follow once case-drain flow or noise trends move off baseline. Engine top-end work on the T4.236, turbocharger, injectors, valve train, is driven by oil analysis and compression checks rather than a fixed hour number.
Seasonal & Environment Servicing on the CP-433B
Cold climates need starting aid support (glow plug or ether) for the Perkins T4.236 and a coolant conditioner concentration check before winter. Wet or humid sites call for more frequent fuel water separator drains. Dusty padfoot compaction work on dry fill loads the air cleaner faster than the standard interval assumes, so inspect it more often in those conditions. Check battery and charging circuit condition before seasonal shutdown or startup.
CP-433B fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine oil pressure lamp (red, oil-can symbol) | Engine oil pressure has dropped below the safe minimum sensed by the panel sender. | Low oil level, worn pump, clogged filter, or failed pressure sender/switch. | Stop engine immediately, check oil level and filter condition before restart. |
| Coolant temperature gauge in red zone | Engine coolant temperature has exceeded normal operating range. | Low coolant, blocked radiator fins, slipping or broken fan belt, faulty thermostat. | Idle engine, check coolant level once safe, inspect belt and radiator for debris. |
| Charging system (battery/alternator) warning lamp | Alternator output is not charging the battery correctly. | Broken or loose belt, failed alternator, bad connection at battery or regulator. | Check belt tension and battery terminals, test alternator output. |
| Air cleaner restriction indicator (pop-up/red flag gauge) | Intake air filter restriction has reached the service limit. | Dirty or clogged air filter element, collapsed intake hose. | Service or replace the air filter element, reset the indicator. |
| Hydraulic oil temperature gauge in red zone | Hydraulic system oil temperature is above normal operating range. | Low hydraulic oil level, clogged oil cooler, relief valve stuck or set too low, pump wear. | Stop and idle, check oil level and cooler fins, inspect for internal relief valve leakage. |
| Parking/secondary brake engaged lamp | Parking or secondary brake is applied or brake pressure is insufficient to release it. | Brake switch left on, low system pressure, brake solenoid or accumulator fault. | Verify control position, check brake system pressure per the testing-and-adjusting procedure before moving the machine. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
CP-433B attachments & work tools
Drum shell (pad-foot vs smooth)
CP prefix denotes a pad-foot drum shell; the CS-433B on the same chassis runs a smooth shell instead. Drum width is about 1.68 m (66 in), diameter about 1.22 m (48 in). Static line load and vibration frequency figures vary across sources and amplitude settings — treat as approximate for this class.
Vibratory drive and amplitude
Hydrostatic direct-drive vibratory system, no belts or chains, with selectable high/low amplitude. Centrifugal force runs roughly 97-135 kN (21,900-30,000 lbf) depending on setting and source, at a frequency in the high-20s to low-30s Hz range. Treat exact figures as configuration-dependent rather than fixed.
Front leveling / strike-off blade
Hydraulically actuated leveling blade about 2 m (6.6 ft) wide mounts at the front for spreading, backfill work, and strike-off ahead of the compaction pass. It runs off the machine's own hydraulic cylinder rather than a separate quick-coupler system.
Drum scraper bar
A spring-loaded scraper bar rides against the drum shell to clear sticky soil from pads and keep the shell clean, standard practice across Cat's single-drum soil-compactor line in this size class. Exact scraper hardware for this specific B-series unit is not itemized in public spec sheets — confirm in the parts manual.
Shell-kit mounting
Pad-foot/smooth conversion shells bolt directly onto the base drum in curved segments; no quick-hitch or coupler mechanism is involved. This bolt-on approach is standard across Cat's smooth/pad-foot roller range for switching drum duty without swapping the entire drum.
Operator station, guarding, ballast
Service manual sections cover steering, propel, and parking-brake systems, pointing to a self-propelled, ride-on machine. A tow-type description (towed by a D3B/D4H dozer) circulating online is not backed by the machine's own drivetrain documentation and should be treated with caution. ROPS/canopy spec and any factory ballast-weight kit are not itemized for this exact model — verify configuration with a dealer.
Size class and drivetrain
Operating weight is about 6.7 t (14,700 lb), diesel engine rated near 102 hp (76 kW), a single steel drum at the front and a rubber-tired rear axle (14.9x24 tires), travel speed to about 12 km/h (7.5 mph). This places it in the compact single-drum soil-compactor class alongside similarly sized pad-foot/smooth competitors.
All CP-433B assemblies by section
Every catalogued assembly group for the Caterpillar CP-433B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Air Inlet And Exhaust System
776598 Air Cleaner Gp
| 07***98 | Air Cleaner Group | 1 |
7r4430 Kit-Exhaust
| 06***10 | Clamp-Tubing | 1 |
| 08***80 | Muffler; S/N 1mg27-Up | 1 |
| 08***81 | Tube; S/N 1mg27-Up | 1 |
7w2565 Manifold Gp-Exhaust
| 7W***65 | Manifold Group-Exhaust | 1 |
9y3096 Manifold Gp-Inlet
| 9Y***96 | Manifold Group-Inlet | 1 |
7w2585 Manifold Gp-Inlet
| 7W***85 | Manifold Group-Inlet | 1 |
7r8055 Muffler Gp
| 7R***55 | Muffler Group | 1 |
7r7439 Muffler Gp
| 7R***39 | Muffler Group | 1 |
7w2584 Turbocharger Gp
| 7W***84 | Turbocharger Group | 1 |
7w2573 Turbocharger Gp
| 7W***73 | Turbocharger Group | 1 |
Basic Engine
9y5861 Camshaft Gp
| 9Y***61 | Camshaft Group | 1 |
7c3102 Camshaft Gp
| 7C***02 | Camshaft Group | 1 |
7w6206 Cover Gp-Valve Mechanism
| 7W***06 | 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 |
9y5858 Cylinder Block Gp
| 9Y***58 | Cylinder Block Group | 1 |
9y2629 Cylinder Block Gp
| 9Y***29 | Cylinder Block Group | 1 |
7c9258 Cylinder Block Gp
| 7C***58 | Cylinder Block Group | 1 |
7c9257 Cylinder Head Gp
| 7C***57 | Cylinder Head Group | 1 |
7w2521 Cylinder Head Gp
| 7W***21 | Cylinder Head Group | 1 |
7w2517 Cylinder Head Gp
| 7W***17 | Cylinder Head Group | 1 |
7c3750 Cylinder Head Gp
| 7C***50 | 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 |
9y5003 Gear Gp-Front
| 9Y***03 | Gear Group-Front; Gear Gp-Front Idler | 1 |
7c3103 Housing Gp-Flywheel
| 7C***03 | Housing Group-Flywheel | 1 |
7w1143 Housing Gp-Front
| 7W***43 | Housing Group-Front | 1 |
9y5045 Housing Gp-Front
| 9Y***45 | Housing Group-Front | 1 |
7w2537 Lifting Gp
| 7W***37 | Lifting Group-Engine; Lifting Eye Gp-Engine | 1 |
9y3094 Mounting Gp-Engine
| 9Y***94 | Mounting Group-Engine | 1 |
7c3104 Pan Gp-Oil
| 7C***04 | Pan Group-Oil; Pan Gp-Engine Oil | 1 |
7w2511 Piston & Rod Gp
| 7W***11 | Piston & Rod Group; Rod & Piston Gp | 1 |
7r7194 Power Gp-Part 3 Of 3
| 7R***94 | Power Group | 1 |
7r7194 Power Gp-Part 1 Of 3
| 7R***94 | Power Group | 1 |
7r7194 Power Gp-Part 2 Of 3
| 7R***94 | Power Group | 1 |
7c8209 Pulley Gp-Crankshaft
| 7C***09 | Pulley Group-Crankshaft | 1 |
7w2531 Valve-Mechanism Gp
| 7W***31 | Valve Mechanism Group | 1 |
Braking System
6r1506 Brake Ar
| 6R***06 | Brake Ar | 1 |
Cooling System
9y3095 Fan Gp
| 9Y***95 | Fan Group | 1 |
7c3112 Lines Gp-Water
| 7C***12 | Lines Group-Water; Lines Gp-Engine Water | 1 |
9y3097 Pump Gp-Water
| 9Y***97 | Pump Group-Water | 1 |
4w7684 Pump Gp-Water
| 4W***84 | Pump Group-Water | 1 |
Electrical System
871266 Back-Up Gp-Alarm
| 08***66 | Alarm Group-Backup | 1 |
7r7913 Electrical Gp-Part 2 Of 2
| 7R***13 | Electrical Group | 1 |
7r7913 Electrical Gp-Part 2 Of 3
| 7R***13 | Electrical Group | 1 |
7r7913 Electrical Gp-Part 1 Of 2
| 7R***13 | Electrical Group | 1 |
7r7913 Electrical Gp-Part 3 Of 3
| 7R***13 | Electrical Group | 1 |
7r7913 Electrical Gp-Part 1 Of 3
| 7R***13 | Electrical Group | 1 |
5e8032 Horn Gp
| 5E***32 | Horn Group | 1 |
8c7479 Light Gp
| 8C***79 | Lighting Group | 1 |
7c9252 Mounting Gp-Alternator
| 7C***52 | Mounting Group-Alternator | 1 |
7c9269 Mounting Gp-Starting Motor
| 7C***69 | Mounting Group-Starting Motor; Mounting Gp- Starting Motor | 1 |
780622 Motor As-Starter
| 07***22 | Starting Motor As-Electric | 1 |
7c4622 Starting Motor Gp-Electric
| 7C***22 | Starting Motor Group-Electric | 1 |
Engine Arrangement
9y5859 Engine Ar-Primary-Part 2 Of 2
| 7C***99 | Pump Group-Fuel | 1 |
| 7C***04 | Pan Group-Oil; Pan Gp-Engine Oil | 1 |
| 7C***06 | Pump Group-Engine Oil | 1 |
9y5859 Engine Ar-Primary-Part 1 Of 2
| 4P***36 | Gauge Group-Oil Level (Dipstick) | 1 |
| 7C***03 | Housing Group-Flywheel | 1 |
| 7C***05 | Gauge Group-Oil Level (Dipstick) | 1 |
9y3100 Engine Ar
| 1W***78 | Gear Group-Front; Gear Gp-Front Idler | 1 |
| 7C***02 | Camshaft Group | 1 |
| 7C***03 | Housing Group-Flywheel | 1 |
Frame And Body
871408 Cab Gp-Part 1 Of 2
| 08***08 | Cab Group | 1 |
871198 Cab Gp
| 08***98 | Cab Group | 1 |
871408 Cab Gp-Part 2 Of 2
| 08***08 | Cab Group | 1 |
7r9090 Door Gp-Lh
| 7R***90 | Door Group-Lh | 1 |
7r9089 Door Gp-Rh
| 7R***89 | Door Group-Rh | 1 |
0868886 Fan Gp
| 08***86 | Fan Group | 1 |
6r0738 Frame Gp-Compactor-Part 1 Of 3
| 6R***38 | Frame Group-Compactor | 1 |
871199 Frame Gp-Compactor-Part 1 Of 3
| 08***99 | Frame Group-Compactor | 1 |
6r0738 Frame Gp-Compactor-Part 1 Of 2
| 6R***38 | Frame Group-Compactor | 1 |
6r0738 Frame Gp-Compactor-Part 2 Of 3
| 6R***38 | Frame Group-Compactor | 1 |
871199 Frame Gp-Compactor-Part 1 Of 2
| 08***99 | Frame Group-Compactor | 1 |
871199 Frame Gp-Compactor-Part 2 Of 2
| 08***99 | Frame Group-Compactor | 1 |
871199 Frame Gp-Compactor-Part 3 Of 3
| 08***99 | Frame Group-Compactor | 1 |
871199 Frame Gp-Comactor-Part 2 Of 3
| 08***99 | Frame Group-Compactor | 1 |
6r0738 Frame Gp-Compactor-Part 2 Of 2
| 6R***38 | Frame Group-Compactor | 1 |
6r0738 Frame Gp-Compactor-Part 3 Of 3
| 6R***38 | Frame Group-Compactor | 1 |
7r8053 Grill Gp-Sound Suppression
| 7R***53 | Grill Group-Sound Suppression | 1 |
7r8051 Guard Gp-Oil Pan
| 7R***51 | Guard Group-Oil Pan | 1 |
7r9099 Panel Gp-Lh
| 7R***99 | Panel Group-Sound Suppression | 1 |
7r8120 Plate Gp-Sound Suppression
| 7R***20 | Plate Group-Sound Suppression | 1 |
871269 Rops Gp
| 08***69 | Rops Group | 1 |
5e9285 Sheet Metal Gp-Part 1 Of 2
| 5E***85 | Sheet Metal Group | 1 |
7r8222 Sheet Metal Gp
| 7R***22 | Sheet Metal Group | 1 |
5e9285 Sheet Metal Gp-Part 2 Of 2
| 5E***85 | Sheet Metal Group | 1 |
7r8222 Sheet Metal Gp-Part 2 Of 2
| 7R***22 | Sheet Metal Group | 1 |
7r8222 Sheet Metal Gp-Part 1 Of 2
| 7R***22 | Sheet Metal Group | 1 |
0869422 Step Gp
| 08***22 | Step Group | 1 |
7r7981 Suppression Ar-Sound
| 7R***81 | Suppression Ar-Sound | 1 |
Fuel System
7c3115 Filter Gp-Fuel
| 7C***15 | Filter Group-Fuel | 1 |
9y3316 Lines Gp-Fuel Filter
| 9Y***16 | Lines Group-Fuel Filter | 1 |
7w2588 Lines Gp-Fuel Injection
| 7W***88 | Lines Group-Fuel Injection | 1 |
7n6422 Pump Gp-Fuel
| 7N***22 | Pump Group-Fuel | 1 |
7c2799 Pump Gp-Fuel
| 7C***99 | Pump Group-Fuel | 1 |
7c3107 Pump Gp-Fuel Injection
| 7C***07 | Pump Group-Fuel Injection | 1 |
7c3139 Pump Gp-Fuel Injection
| 7C***39 | Pump Group-Fuel Injection | 1 |
7c8029 Separator Gp-Water
| 7C***29 | Separator Group-Water | 1 |
9n6519 Separator Gp-Water
| 9N***19 | Separator Group-Water | 1 |
Hydraulic System
6r0731 Blade Gp-Part 1 Of 2
| 6R***31 | Blade Group | 1 |
6r0731 Blade Gp-Part 2 Of 2
| 6R***31 | Blade Group | 1 |
6r0727 Control Gp-Part 3 Of 3
| 6R***27 | Control Group | 1 |
6r0727 Control Gp-Part 2 Of 3
| 6R***27 | Control Group | 1 |
6r0727 Control Gp-Part 1 Of 3
| 6R***27 | Control Group | 1 |
780614 Cylinder Gp (Chg 00a)
| 07***14 | Cylinder Group | 1 |
1g7726 Cylinder Gp-Hydraulic
| 1G***26 | Cylinder Group-Hydraulic | 1 |
1219564 Cylinder Gp-Hydraulic
| 12***64 | Cylinder Group-Hydraulic | 1 |
6r0733 Filter Gp-Hydraulic Oil
| 6R***33 | Filter Group | 1 |
777187 Valve Gp-Hydraulic Control
| 07***87 | Valve Group-Control | 1 |
Lubrication System
7c9264 Cooler & Filter Gp
| 7C***64 | Cooler & Filter Group-Engine Oil | 1 |
7c9264 Cooler & Filter Gp-Engine Oil
| 7C***64 | Cooler & Filter Group-Engine Oil | 1 |
7w6220 Filler Gp-Oil
| 7W***20 | Filler Group-Oil; Filler Gp-Engine Oil | 1 |
7c3110 Fumes Disposal Gp
| 7C***10 | Fumes Disposal Group | 1 |
7c3105 Gauge Gp-Oil Level (Dipstick)
| 7C***05 | Gauge Group-Oil Level (Dipstick) | 1 |
4p3836 Gauge Gp-Oil Level (Dipstick)
| 4P***36 | Gauge Group-Oil Level (Dipstick) | 1 |
| 4P***37 | Tube As-Oil Level | 1 |
| 4P***38 | Gauge As-Oil Level (Dipstick); (Engine) | 1 |
7c3106 Pump Gp-Engine Oil
| 7C***06 | Pump Group-Engine Oil | 1 |
Operator Station
7r8369 Panel Gp-Instrument
| 7R***69 | Panel Group-Instrument | 1 |
7r8369 Panel As-Instrument
| 7R***69 | Panel Group-Instrument | 1 |
8y4032 Seat Belt Gp
| 8Y***32 | Seat Belt Group | 1 |
9g7641 Switch Gp-Start
| 9G***41 | Switch Group-Start; -Engine, Key-Vims Service | 1 |
Power Train
7x5281 Axle As-Part 1 Of 3
| 7X***81 | Axle Group | 1 |
7x5281 Axle As-Part 3 Of 3
| 7X***81 | Axle Group | 1 |
7x5281 Axle As-Part 2 Of 3
| 7X***81 | Axle Group | 1 |
6r0725 Drive Train Gp
| 6R***25 | Drive Train Group | 1 |
780591 Drive-Pump
| 07***91 | Drive-Pump | 1 |
8c9287 Drum Ar-Padded
| 07***32 | Tip | 16 |
| 07***33 | Pin-Flexible | 16 |
| 1D***38 | B. 1" N.C. X 3 1/2" | 6 |
8c9288 Drum Ar-Smooth
| 07***76 | Blade, Rubber Scraper | 2 |
| 1D***38 | B. 1" N.C. X 3 1/2" | 8 |
| 2H***91 | Nut | 8 |
871201 Drum As-Padded-Part 2 Of 2
| 08***01 | Drum As | 1 |
871201 Drum As-Part 2 Of 2
| 08***01 | Drum As | 1 |
871201 Drum As-Part 1 Of 2
| 08***01 | Drum As | 1 |
871201 Drum As-Padded-Part 1 Of 2
| 08***01 | Drum As | 1 |
1g7141 Drum As-Pad-Part 1 Of 2
| 1G***41 | Drum As-Padded | 1 |
1g7141 Drum As-Pad-Part 2 Of 2
| 1G***41 | Drum As-Padded | 1 |
7r6919 Drum As-Smooth-Part 1 Of 2
| 7R***19 | Drum As-Padded | 1 |
7r6919 Drum As-Smooth-Part 2 Of 2
| 7R***19 | Drum As-Padded | 1 |
871200 Drum As-Smooth-Part 2 Of 2
| 08***00 | Drum Group | 1 |
871200 Drum As-Smooth-Part 1 Of 2
| 08***00 | Drum Group | 1 |
871200 Drum Gp-Part 2 Of 2
| 08***00 | Drum Group | 1 |
871200 Drum Gp-Part 1 Of 2
| 08***00 | Drum Group | 1 |
0869216 Filter Gp
| 08***16 | Filter Group-Hydraulic; -Hydraulic | 1 |
7x5283 Gearbox Housing & Bearing As
| 7X***83 | Gearbox | 1 |
1g9442 Gearbox Gp
| 1G***42 | Gearbox Group | 1 |
7r4493 Motor As-Hydraulic-Part 2 Of 2
| 7R***93 | Motor As-Hydraulic | 1 |
7r4493 Motor As-Hydraulic-Part 1 Of 2
| 7R***93 | Motor As-Hydraulic | 1 |
780623 Motor As-Hydraulic
| 07***23 | Motor As-Hydraulic | 1 |
780590 Motor Gp*R
| 07***90 | Motor Group | 1 |
1123435 Motor Gp-Part 2 Of 2
| 11***35 | Motor Group | 1 |
1123435 Motor Gp-Part 1 Of 2
| 11***35 | Motor Group | 1 |
6r0724 Propel Gp-Part 1 Of 2
| 6R***24 | Propel Group | 1 |
6r0724 Propel Gp-Part 1 Of 4
| 6R***24 | Propel Group | 1 |
6r0724 Propel Gp-Part 2 Of 2
| 6R***24 | Propel Group | 1 |
6r0724 Propel Gp-Part 2 Of 4
| 6R***24 | Propel Group | 1 |
6r0724 Propel Gp-Part 4 Of 4
| 6R***24 | Propel Group | 1 |
6r0724 Propel Gp-Part 3 Of 4
| 6R***24 | Propel Group | 1 |
780588 Pump Gp-Tandem-Part 2 Of 2*R
| 07***88 | Pump Group | 1 |
780588 Pump Gp-Tandem-Part 1 Of 2*R
| 07***88 | Pump Group | 1 |
1g7577 Pump Gp-Tandem-Part 2 Of 2
| 1G***77 | Pump Group-Tandem | 1 |
1g7577 Pump Gp-Tandem-Part 1 Of 2
| 1G***77 | Pump Group-Tandem | 1 |
7x8557 Reducer As-Gear-Part 1 Of 2
| 7X***57 | Reducer As-Gear | 1 |
780592 Reducer As-Gear-Part 2 Of 2
| 07***92 | Reducer As-Gear | 1 |
780592 Reducer As-Gear-Part 1 Of 2
| 07***92 | Reducer As-Gear | 1 |
780599 Reducer As-Gear-Part 1 Of 2
| 07***99 | Reducer As-Gear | 1 |
780599 Reducer As-Gear-Part 2 Of 2
| 07***99 | Reducer As-Gear | 1 |
7x8557 Reducer As-Gear-Part 2 Of 2
| 7X***57 | Reducer As-Gear | 1 |
822784 Valve Gp
| 08***84 | Valve Group | 1 |
822785 Valve Gp
| 08***85 | Valve Group | 1 |
780593 Valve Gp
| 07***93 | Valve Group | 1 |
7r6615 Valve Gp-Solenoid
| 7R***15 | Valve Group-Solenoid | 1 |
6r0728 Wheel & Tire Gp
| 6R***28 | Wheel & Tire Group | 1 |
6r0739 Wheel & Tire Gp
| 6R***39 | Wheel & Tire Group | 1 |
Service Equipment And Supplies
Hardware Chart
| 7H***00 | Chart-Hardware | 1 |
O-Ring Chart
| 7R***00 | Chart-O-Ring | 1 |
6r0712 Finish Gp
| 6R***12 | Finish Group | 1 |
1g9490 Finish Gp
| 1G***90 | Finish Group | 1 |
7r7193 Finish Gp
| 7R***93 | Finish Group | 1 |
6r0711 Finish Gp
| 6R***11 | Finish Group | 1 |
1g9492 Finish Gp
| 1G***92 | Finish Group | 1 |
7r7192 Finish Gp
| 7R***92 | Finish Group | 1 |
Steering System
773197 Cylinder Gp-Hydraulic (Steering)(Chg 00)
| 07***97 | Cylinder Group-Hydraulic | 1 |
7x5311 Filter Gp-Oil
| 7X***11 | Filter Group-Oil | 1 |
773806 Pump Gp-Hydraulic (Steering)
| 07***06 | Pump Group-Hydraulic | 1 |
7r7191 Steering Gp-Part 1 Of 4
| 7R***91 | Steering Group | 1 |
7r7191 Steering Gp-Part 1 Of 2
| 7R***91 | Steering Group | 1 |
7r7191 Steering Gp-Part 2 Of 2
| 7R***91 | Steering Group | 1 |
7r7191 Steering Gp-Part 4 Of 4
| 7R***91 | Steering Group | 1 |
7r7191 Steering Gp-Part 3 Of 4
| 7R***91 | Steering Group | 1 |
7r7191 Steering Gp-Part 2 Of 4
| 7R***91 | Steering Group | 1 |
780356 Valve Gp-Steering
| 07***56 | Valve Group-Steering | 1 |
Vibratory System
780589 Pump As-Hydraulic*R
| 07***89 | Pump As-Hydraulic | 1 |
1g7579 Pump Gp-Hydraulic
| 1G***79 | Pump Group-Hydraulic | 1 |
6r0726 Vibration Gp
| 6R***26 | Vibration Group | 1 |
6r0726 Vibration Gp-Part 1 Of 2
| 6R***26 | Vibration Group | 1 |
6r0726 Vibration Gp-Part 2 Of 2
| 6R***26 | Vibration Group | 1 |
CP-433B serial number reference
The PIN plate on a B-series Cat vibratory compactor is a riveted metal tag mounted on the machine frame, commonly near the front frame rail by the articulation joint - check there first and confirm against the operator's manual for exact placement on your unit. The plate shows an 8-character serial: the first 3 alphanumeric characters are the prefix (model and production-run identifier), followed by a 5-digit sequence number unique to that machine.
| Prefix | Identifies | Notes |
|---|---|---|
| 1MG | CP-433B / CS-433B vibratory compactor, B-series | Serial prefix 1MG covers both the CP-433B (pad-foot) and CS-433B (smooth-drum) versions of this B-series vibratory compactor, from serial 1MG00001-UP. Powered by the Perkins T4.236 diesel (4-cylinder, 3.9 L, turbocharged). This is the original production-run break for the model; no distinct plant, region, or pad-foot/smooth-drum split is documented within this range. |
| 4FK | CP-433B / CS-433B vibratory compactor, B-series | Serial prefix 4FK is a later production-run break for the CP-433B/CS-433B pairing, same Perkins T4.236 engine and shared parts/service literature as the 1MG break. Parts documentation splits this range into internal sub-ranges (4FK1-210, 4FK211-224, 4FK225-238, 4FK239-UP) with no stated configuration change tied to each sub-break. Standalone service-manual listings for this exact prefix most often name CS-433B specifically; a combined CP-433B/CS-433B operation and maintenance manual lists 4FK1-UP alongside 1MG1-UP as covered ranges, consistent with 4FK also applying to CP-433B, but confirm against the PIN plate if precision matters. One retail parts-manual listing renders the prefix as 4KF instead of 4FK - every source with a detailed range breakdown uses 4FK, so treat 4KF as a transposition error in that single listing rather than a distinct prefix; check the actual PIN plate if a machine shows 4KF. |
Frequently asked questions
What engine does the Caterpillar CP-433B use?
A Perkins T4.236 turbocharged 4-cylinder diesel rated at about 76 kW (102 hp) gross. This is specific to the B-series; the later CP-433C switched to a Cat 3054T, and the CP-433E moved to a 3054C with electronic vibratory control.
What is the operating weight of the CP-433B?
About 6.7 t (14,700 lb) in base configuration, with some documented builds closer to 6.9 t (15,225 lb). Exact weight varies by configuration/series, so confirm against the plate on a specific unit.
What replaced the Caterpillar CP-433B?
The CP-433C took over in the late 1990s with Caterpillar's own 3054T engine in place of the Perkins. The CP-433E followed after that, adding a 3054C engine and an electronic vibratory control module, the first in the family with electronic amplitude switching.
What CP-433B owners discuss
What's the most common Perkins T4.236 engine complaint owners report on this machine?
Hard starting, rough idle, or gradual power loss traced back to the mechanical fuel lift pump rather than the injection pump itself. A worn lift pump diaphragm lets air into the fuel supply, which shows up as hard starting after sitting and inconsistent running. In worse cases the diaphragm leaks fuel past itself into the crankcase, diluting engine oil and cutting its lubricating ability. Owners check the weep/bleed hole on the lift pump housing first: fuel showing there confirms a bad diaphragm before anyone touches the injection pump. Any time hard starting shows up after a long idle period, oil level and smell get checked at the same time. Have your dealer verify injection pump timing and check for fuel dilution in the oil if this pattern shows up.
The drum won't vibrate, or vibration cuts in and out. What's the accepted troubleshooting order?
Work from the simplest cause outward: linkage and switch first, hydraulics second, internal drum components last. Start with the control linkage from the vibratory lever to the pump for looseness or a binding cable, then check hydraulic tank oil level since low oil kills vibratory output before anything mechanical fails. If linkage and oil check out, suspect the vibratory pump or motor next, then the splined coupling and driveshaft inside the drum itself. A sheared coupling lets the motor spin freely without turning the eccentric weight shaft, which looks identical to a bearing failure from the outside. Worn eccentric-shaft weight bearings are the last suspect and mean dropping the drum to inspect. Have your dealer verify hydraulic pressure and internal bearing condition before any drum disassembly.
What wear pattern shows up on the drum and pad feet on this model?
Because this is the pad-foot configuration, the pad tips themselves take the abuse: rounding, chipping, or snapping off in rocky or abrasive soil. Shops typically re-face or build up worn tips rather than replace the whole shell. Separate from the feet, the eccentric weight shaft bearings run in a sealed oil bath and are the item most owners budget for over the life of the machine. Factory service literature for this compactor family sets a multi-year, multi-thousand-hour lube interval for this bearing (exact interval varies by series and configuration), and shops watch for shaft end-play and discolored or metallic lube as the leading indicators before a bearing actually lets go. Have your dealer verify bearing lube condition and shaft end-play if any roughness or noise shows up at the drum.
Is there a known steering or articulation wear issue on these compactors?
The steer pivot (articulation) joint and steering cylinder pins are grease points, not sealed-for-life, and owners consistently point to missed grease intervals as the top cause of sloppy or heavy steering feel, well ahead of a cylinder or control valve actually being at fault. The factory testing-and-adjusting procedure for this compactor's steering system lists the pivot and cylinder pins as routine lubrication points for exactly this reason. Regreasing on schedule resolves most reported steering complaints before parts get replaced. Have your dealer verify steering cylinder and pivot bushing play if the machine still feels sloppy after a full regrease.
What electrical or sensor problems come up most on these older compactors?
Reported electrical faults center on the vibratory switch and control circuit rather than engine sensors: corroded connector pins and chafed harness wiring near the drum and operator console cause intermittent or complete loss of vibration that looks exactly like a hydraulic or mechanical failure from the operator's seat. Before condemning the vibratory pump or motor, the accepted first step is checking fuses and relays, then wiggle-testing the harness and connectors for corrosion or chafe damage. On a machine this old, connector corrosion is the default suspect for any intermittent fault. Have your dealer verify wiring continuity and connector condition if a vibratory fault won't clear after a visual inspection.
Any known quirks with the hydrostatic propel drive?
The direct hydrostatic propel system is simple and generally holds up well, but reduced power on grade or the machine creeping/surging at neutral gets traced to charge pressure or a propel control linkage adjustment far more often than an actual main pump or motor failure. The accepted order is to check and adjust the propel control linkage, then verify charge pump pressure, before pulling the main pump or drive motor for inspection. Have your dealer verify charge pressure and pump/motor case-drain flow if drive power loss continues after linkage adjustment.
What should I check before buying a used CP-433B?
Start the engine cold and watch for smoke or hard starting, a red flag for the Perkins T4.236 lift-pump/injection issues covered above, then check the oil for a fuel smell or overfill from diaphragm leakage. Cycle vibration in both high and low amplitude and listen for coupling or bearing noise from the drum. Inspect the pad feet for wear, cracking, or missing tips, and grab the drum to check for end-play in the eccentric shaft bearings. Work the articulation joint through full steering lock each way and feel for pin or bushing slop. Check hydraulic tank oil level and condition, and look for leaks at the drum seals and propel motor. Confirm all gauges and the vibratory switch respond correctly, and cross-check the hour meter reading against overall wear and paint/panel condition for consistency. Have your dealer verify hydraulic pump and motor condition and vibratory bearing health with a full inspection before purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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