Caterpillarwork toolcold planer

Caterpillar PC203

Maintenance schedule, common problems & OEM parts breakdown

The Cat PC203 is a passive hydraulic cold-planer (asphalt and concrete milling) attachment, not a self-powered machine: it carries no engine, ECM, or transmission of its own. A standard-flow, unidirectional gerotor motor drives its 350 mm (14 in) drum directly, drawing all its power from the host carrier's auxiliary hydraulic circuit at roughly 55-100 L/min (14-26 gal/min) and 160-240 bar (2,320-3,480 psi). The base unit weighs about 650 kg (1,433 lb), cuts to a depth of up to roughly 127-150 mm (5-6 in) depending on drum and bit configuration, and offers 650 mm (26 in) of hydraulic sideshift for working tight against curbs, walls, and structures. It mounts to Cat skid steer loaders, multi-terrain loaders, compact track loaders, compact wheel loaders, and backhoe loaders, and sits in an older Cat Cold Planer lineup alongside the wider PC204 and the larger PC205, PC206, and PC210, all sharing the same gerotor-direct-drive architecture scaled up by drum width and depth capacity.

Across the PC200-series family the differences are mostly scale rather than architecture: PC204 widens the drum, and PC205, PC206, and PC210 step up drum width and depth-of-cut capacity further, while each sibling keeps its own serial-prefix identity alongside a broadly common hydraulic-motor and hose layout. Caterpillar has since moved its current cold-planer catalog to a newer PC104/PC105 standard-flow line and a separate PC305-PC412 high-flow line, leaving the PC203 and its siblings as a legacy standard-flow group still supported through parts channels. That legacy status is exactly why the PC203 still matters in the used and parts market: buyers judge a used unit on drum and toolholder wear, gerotor motor condition, and hose/coupler integrity rather than on engine hours, and shared components across the PC203/PC204/PC205/PC206/PC210 family keep older units economical to run long after Caterpillar's newer catalog line took over new-unit sales.

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 PC203 specifications

Engine

Power source	No onboard engine. The PC203 is a passive hydraulically driven cold planer attachment; cutting drum torque and speed come entirely from the host carrier's hydraulic circuit.
Drive type	Direct drive — variable-speed, uni-directional gerotor-style hydraulic motor turning the cutting drum directly (standard-flow configuration).
Emissions tier	Not applicable — attachment has no engine or ECM of its own.

Weights

Operating weight (350 mm / 14 in standard drum)	650 kg (1,433 lb)
Ground pressure	Not published — the tool rides on two wear-resistant skid plates rather than an independent undercarriage, so a ground-pressure figure is not issued for this class of attachment.

Dimensions

Overall width	1720 mm (68 in)
Overall length	1180 mm (46 in)
Overall height	840 mm (33 in)
Standard drum (cutting) width	350 mm (14 in)
Side-shift travel	650 mm (26 in), hydraulically actuated for close planing along curbs and walls
Tilt angle range	±8.5°, spring-controlled on this standard-flow model
Optional narrow drum width/depth combinations	80/200 mm (3 in/8 in), 152/200 mm (6 in/8 in), 203/200 mm (8 in/8 in), and 305/200 mm (12 in/8 in) width/max-depth pairings, for jobs needing a narrower cut than the standard 350 mm drum

Performance

Required hydraulic flow (host carrier, standard flow)	55–100 L/min (14–26 gpm)
Optimal hydraulic pressure	160–240 bar (2,320–3,480 psi)
Drum torque at max pressure	approx. 1250 N·m (approx. 920 ft·lb)
Drum speed at max flow	178 rpm
Maximum depth of cut	127 mm (5 in)
Bit configuration	Conical, all-purpose bits standard on the 350 mm (14 in) drum; optional concrete bits and water-sprinkler kit available
Host carrier compatibility	Designed for Cat skid steer loaders, multi-terrain loaders, compact track loaders, compact wheel loaders and backhoe loaders running standard-flow hydraulics; runs on the smallest end of the Cat cold planer line, sized under the wider PC204/PC205/PC206/PC210 which need progressively higher (and in the largest cases high-flow) hydraulic output

Service capacities (summary)

Fuel tank	Not applicable — attachment has no fuel system
Hydraulic system	No dedicated onboard reservoir; runs on the host carrier's hydraulic oil through quick-disconnect couplings within the flow/pressure ranges listed under Performance
Engine oil	Not applicable — no engine
Cooling system	Not applicable — cooling is handled by the host carrier's hydraulic system, not the attachment

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

PC203 fluids & capacities

System	Capacity	Recommended fluid
Gerotor drive motor (drum drive)	No separate fill point or published oil capacity - the PC203 drum is turned by a direct-drive gerotor hydraulic motor that runs on the host carrier's hydraulic oil, not an internal gear case. There is no planetary gearbox on this size class.	Runs on whatever hydraulic oil is specified in the host skid steer/compact track loader/backhoe loader's own operation and maintenance manual; the PC203 carries no distinct internal lubricant of its own for the drive motor.
Hydraulic system (attachment circuit)	No dedicated reservoir or tank on the attachment itself. Required hydraulic flow is 55-100 L/min (14-26 gal/min) at an optimal working pressure of 160-240 bar (2,320-3,480 psi); standard-flow hydraulics on the host machine are sufficient.	Use the host carrier's own OMM-specified hydraulic oil (brand/viscosity per that machine's fluid chart); the PC203 itself has no separate hydraulic fluid spec or climate-viscosity split.
Grease points (mounting frame pivots, tilt and sideshift linkage, drum bearing seals)	Spec only - no fill capacity applies. Grease each zerk fitting until fresh grease purges at the joint per the routine service interval; exact point count and interval are not confirmed for this exact model in sources checked.	Cat multipurpose grease (lithium-complex type, rated roughly -30 to 40 deg C / -22 to 104 deg F) is Cat's standard line for pin, pivot, and linkage grease points on its hydraulic work tools; no PC203-specific grease callout or alternate cold-weather product was found published by name.

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

Caterpillar PC203 maintenance schedule

Service interval	Tasks
Every 50 h	Inspect cutting bits and toolholders for wear, cracking, or looseness; rotate or replace as needed Check the drum, skid shoes, and moldboard/side plates for wear, cracks, or impact damage Inspect hydraulic hoses, quick-disconnect couplers, and fittings for leaks, chafing, or loose connections Grease sideshift and depth/tilt cylinder pivot points and drum support pins Verify mount-plate coupler pins and wedge-lock engagement before attaching to the carrier Clear packed asphalt or debris from the drum compartment and skid shoe pockets
Every 250 h	Inspect the gerotor drive motor for external leakage at the shaft seal and case drain Check drum drive coupling and motor mounting fasteners for looseness or wear Inspect sideshift and depth cylinder rods for scoring and check rod seals for leakage Check the drum bearing/support housing for play, noise, or excess heat Measure toolholder and drum-body wear against service limits
Every 500 h	Replace worn toolholders as a matched set to keep the cutting pattern uniform Test the carrier's auxiliary hydraulic flow and pressure against PC203 spec (55-100 L/min at 160-240 bar) Inspect the gerotor motor output shaft/coupling spline for wear Re-torque drum frame, side-plate, and moldboard structural fasteners Replace skid shoe wear plates once below service thickness Inspect and clean any case-drain filter or screen in the hydraulic circuit
Every 1,000 h	Remove the drum and inspect the internal shaft, bearings, and seals for wear Rebuild or replace the gerotor motor if drum speed has dropped below rated range Service sideshift slide rails and bushings; replace wear strips Inspect the full hose assembly set and replace any hose or O-ring face seal fitting showing age cracking Drift-test depth/tilt cylinders for internal bypass and reseal if needed
Every 2,000 h	Perform a full teardown inspection of the drum bearing and seal package Replace gerotor motor shaft seals and inspect the gear set for wear Overhaul sideshift and depth cylinders with new seal kits and rod bushings Replace mount-plate bushings and pins to restore a tight carrier coupling Inspect toolholder pockets in the drum shell for elongation; resurface or replace the drum if out of tolerance
Every 4,000 h	Evaluate the drum shell and toolholder pockets against wear limits; replace the drum assembly if resurfacing is no longer viable Replace the gerotor motor as a complete unit if repeated seal and gear repairs no longer restore rated speed Renew all sideshift/depth cylinder seal kits and slide-rail wear strips as a set Replace the mount-plate structure or pins if coupler play can no longer be shimmed out Perform a full corrosion and structural inspection before returning a long-stored unit to service

Servicing the PC203 beyond the schedule

Predictive Maintenance & Fluid Analysis

Because the PC203 has no reservoir or engine of its own, predictive care rides on the host carrier's hydraulic oil. Sample the carrier's auxiliary hydraulic fluid regularly and watch for water intrusion or metallic wear particles, which flag internal gerotor motor wear before it causes a stall. Track cutting-drum RPM against rated speed at a known flow setting; a steady drop signals motor efficiency loss. Log bit wear rates per shift to schedule toolholder swaps before pockets in the drum shell take damage.

Corrective & Common Repairs

Typical PC203 repairs center on wear parts: replacing broken or dull conical bits and their toolholders, resealing the gerotor motor shaft after external leakage appears, and swapping skid shoes or wear plates once they let the drum ride too deep. Auxiliary hydraulic hoses and quick-disconnect couplers get replaced after chafing or a coupling failure. Heavy impact loading against curbs or manhole rings can loosen drum-frame or mount-plate fasteners, so re-torquing after a hard strike is routine corrective work.

Overhaul & Rebuild Points

Overhaul work targets the drum and gerotor motor. Rebuild kits address drum bearing and seal wear, plus motor gear-set and shaft-seal wear once driven RPM falls off spec despite correct carrier flow. Toolholder pockets in the drum shell are checked for elongation and either re-machined or retired if wear exceeds tolerance. Sideshift and depth-control cylinders get new seal kits and rod bushings to eliminate drift, and mount-plate pins and bushings are renewed to restore a tight, play-free carrier coupling.

Seasonal & Environment Servicing

Between paving seasons, flush packed asphalt and millings out of the drum housing and skid shoe pockets before storing the attachment, since trapped debris holds moisture against bare steel. Coat the drum, bits, and cylinder rods with rust preventive and block the unit off the ground. Before spring startup, cycle the sideshift and depth cylinders to redistribute seal lubrication, check that cold-stored hoses haven't stiffened or cracked, and inspect auxiliary hydraulic coupler O-rings for winter compression set before reconnecting to a carrier.

PC203 attachments & work tools

Carrier compatibility

Runs on Cat skid steer loaders, multi-terrain loaders, compact track loaders, compact wheel loaders, and backhoe loaders equipped with a standard-flow auxiliary hydraulic circuit. Sized for small residential and commercial milling jobs rather than dedicated highway-class planers.

Mounting / coupler system

Attaches through the Cat skid-steer/multi-terrain-loader universal quick-attach plate (mechanical pin-and-wedge style, matching the carrier's standard attach frame). Auxiliary hydraulic supply connects through standard flat-face quick couplers on the carrier's aux circuit.

Hydraulic arrangement

Needs 55-100 L/min (14-26 gpm) of auxiliary flow at roughly 160-240 bar (2,320-3,480 psi); no separate hydraulic kit or gearbox is used, the cutting drum is direct-driven by a gerotor motor. Falls in the standard-flow class alongside its same-size sibling, versus higher-flow siblings that need a bigger aux pump.

Drum and bit options

Base configuration is a roughly 350 mm (14 in) wide drum carrying an all-purpose conical-bit pattern; narrower drum widths (down to about 80 mm/3 in) are offered for edge and utility cutting, and a concrete-rated bit option replaces the standard asphalt bits when milling concrete. Max depth of cut is around 150 mm (6 in).

Sideshift and tilt

Hydraulic sideshift travel of roughly 650 mm (26 in) lets the drum work past the carrier's tire or track line for edge milling, and the drum tilts roughly plus/minus 8.5 degrees for cross-slope or feathered cuts, per the factory spec sheet.

Water sprinkler kit

An optional water-sprinkler kit is offered across this cold-planer size class for dust suppression during dry milling; treat it as a bolt-on option rather than standard equipment.

Guarding

Drum housing includes an integrated skirt/hood to contain spoil and limit debris throw during milling. Dealer literature reviewed does not spell out additional optional shield kits for this specific size class - confirm current guarding options with a Cat dealer before ordering.

Model-family context

Sits as the base standard-flow unit in an older Cat cold-planer lineup (paired closely with a slightly wider standard-flow sibling, below higher-flow and wider siblings in the same family). Cat's current cold-planer naming has since moved to a different numbering scheme, so do not assume parts or options carry across without confirming the exact model designation.

All PC203 assemblies by section

Every catalogued assembly group for the Caterpillar PC203. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

224-7388 Frame Ar

22***82	Frame Group-Cold Planer; -Rear	1
22***83	Control Group-Cold Planer	1
22***84	Drum Group-Cold Planer	1
22***86	Drive Group-Cold Planer	1

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224-7365 Frame Ar

22***67	Drive Group-Cold Planer	1
22***68	Control Group-Cold Planer	1
22***69	Frame Group-Cold Planer; -Front	1
22***33	Adjustment Group-Depth	1

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219-5450 Frame Ar

21***10	Frame Group-Cold Planer; -Rear	1
21***15	Control Group-Cold Planer	1
21***20	Drum Group-Cold Planer	1
21***25	Drive Group-Cold Planer	1

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224-7394 Frame Ar

22***60	Drum Group-Cold Planer	1
22***61	Control Group-Cold Planer	1
22***62	Frame Group-Cold Planer; -Rear	1
22***63	Drive Group-Cold Planer	1

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224-7393 Frame Ar

22***67	Drive Group-Cold Planer	1
22***68	Control Group-Cold Planer	1
22***69	Frame Group-Cold Planer; -Front	1
22***33	Adjustment Group-Depth	1

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219-5410 Frame Gp-Cold Planer -Rear

21***90	Frame As	1
21***94	Plate-Guide	4
21***95	Plate-Clamp	2
21***96	Plate-Spacer	2

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224-7387 Frame Gp-Cold Planer -Front

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	6
09***16	Ring-Retaining	2
21***03	Plate	2
21***14	Plate-Indicator	1

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224-7364 Frame Gp-Cold Planer -Front

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	6
09***16	Ring-Retaining	2
21***03	Plate	2
21***14	Plate-Indicator	1

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224-7362 Frame Gp-Cold Planer -Rear

21***90	Frame As	1
21***16	Spacer; (21x65x5-mm Thk)	2
22***15	Plate-Guide	4
22***16	Plate-Clamp	2

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224-7382 Frame Gp-Cold Planer -Rear

21***90	Frame As	1
21***16	Spacer; (21x65x5-mm Thk)	2
22***19	Plate-Clamp	1
22***70	Plate-Guide	4

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220-4769 Frame Gp-Cold Planer -Front

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	6
09***16	Ring-Retaining	2
21***03	Plate	2
22***69	Frame Group-Cold Planer; -Front	1

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219-5430 Frame Gp-Cold Planer -Front

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	6
17***11	Locknut; (M16x2-Thd)	10
21***85	Frame As	1
21***86	Cover	1

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232-2327 Spring & Mtg Gp-Leveler -Mounting

23***64	Spring Group-Leveler	1
23***27	Spring & Mtg Group-Leveler; -Mounting	1
6V***06	Fitting-Grease	2
6V***54	Ring; (Retaining)	2

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Hydraulic System

219-5432 Cylinder & Mtg Gp-Cold Planer

21***18	Cylinder Group-Hydraulic; -Rotate	1
21***32	Cylinder & Mtg Group-Cold Planer	1
6V***54	Ring; (Retaining)	2

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224-7401 Cylinder & Mtg Gp-Cold Planer -Rotate

21***18	Cylinder Group-Hydraulic; -Rotate	1
22***01	Cylinder & Mtg Group-Cold Planer; -Rotate	1
6V***54	Ring; (Retaining)	2

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219-5433 Cylinder & Mtg Gp-Cold Planer -Depth

21***21	Cylinder Group-Hydraulic	2
21***23	Pin	3
21***24	Bushing	6
21***26	Pin	1

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230-6433 Cylinder & Mtg Gp-Cold Planer -Sideshift

21***91	Locknut	2
23***51	Cylinder Group-Hydraulic; -Sideshift	1
23***33	Cylinder & Mtg Group-Cold Planer; -Sideshift	1

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224-7403 Cylinder & Mtg Gp-Cold Planer -Sideshift

21***91	Locknut	2
22***03	Cylinder & Mtg Group-Cold Planer; -Sideshift	1
23***51	Cylinder Group-Hydraulic; -Sideshift	1

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224-7402 Cylinder & Mtg Gp-Cold Planer -Depth

21***21	Cylinder Group-Hydraulic	2
21***23	Pin	2
21***24	Bushing	4
21***26	Pin	2

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219-5434 Cylinder & Mtg Gp-Cold Planer -Sideshift

21***91	Locknut	2
21***29	Cylinder Group-Hydraulic; -Sideshift	1
21***34	Cylinder & Mtg Group-Cold Planer; -Sideshift	1

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219-5418 Cylinder Gp-Hydraulic -Rotate

21***18	Cylinder Group-Hydraulic; -Rotate	1
21***19	Kit-Seal	1

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219-5421 Cylinder Gp-Hydraulic

21***19	Kit-Seal	1
21***21	Cylinder Group-Hydraulic	1

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230-6051 Cylinder Gp-Hydraulic -Sideshift

21***31	Kit-Seal	1
23***51	Cylinder Group-Hydraulic; -Sideshift	1

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219-5429 Cylinder Gp-Hydraulic -Sideshift

21***29	Cylinder Group-Hydraulic; -Sideshift	1
21***31	Kit-Seal	1

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249-0580 Hydraulic Ar

22***01	Cylinder & Mtg Group-Cold Planer; -Rotate	1
22***02	Cylinder & Mtg Group-Cold Planer; -Depth	1
22***34	Manifold Group-Control	1
22***17	Valve Group-Check	1

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224-7366 Hydraulic Ar

22***66	Hydraulic Ar	1
22***01	Cylinder & Mtg Group-Cold Planer; -Rotate	1
22***02	Cylinder & Mtg Group-Cold Planer; -Depth	1
22***34	Manifold Group-Control	1

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224-7392 Hydraulic Ar

19***12	Seal-O-Ring	2
22***66	Manifold Group-Control	1
22***92	Hydraulic Ar	1
22***03	Cylinder & Mtg Group-Cold Planer; -Sideshift	1

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248-3076 Hydraulic Ar

21***32	Cylinder & Mtg Group-Cold Planer	1
21***33	Cylinder & Mtg Group-Cold Planer; -Depth	1
21***34	Cylinder & Mtg Group-Cold Planer; -Sideshift	1
22***34	Manifold Group-Control	1

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224-7409 Hydraulic Ar

22***01	Cylinder & Mtg Group-Cold Planer; -Rotate	1
22***02	Cylinder & Mtg Group-Cold Planer; -Depth	1
22***09	Hydraulic Ar	1
22***34	Manifold Group-Control	1

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248-6490 Hydraulic Ar

22***01	Cylinder & Mtg Group-Cold Planer; -Rotate	1
22***02	Cylinder & Mtg Group-Cold Planer; -Depth	1
22***34	Manifold Group-Control	1
22***17	Valve Group-Check	1

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219-5455 Hydraulic Ar

21***32	Cylinder & Mtg Group-Cold Planer	1
21***33	Cylinder & Mtg Group-Cold Planer; -Depth	1
21***34	Cylinder & Mtg Group-Cold Planer; -Sideshift	1
21***55	Hydraulic Ar	1

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231-4185 Lines Gp-Connecting

13***98	Connector	1
14***18	Connector As	2
14***27	Connector Group	4
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1

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231-9853 Lines Gp-Connecting

14***18	Connector As	1
14***27	Connector Group	4
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
15***95	Fitting As; (Quick Disconnect, Male)	1

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248-3077 Lines Gp-Connecting

14***48	Fitting As; (Quick Disconnect, Male)	1
14***49	Fitting As; (Quick Disconnect, Female)	1
14***18	Connector As	2
14***25	Connector As.	2

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248-6491 Lines Gp-Connecting

14***48	Fitting As; (Quick Disconnect, Male)	1
14***49	Fitting As; (Quick Disconnect, Female)	1
14***18	Connector As	2
14***25	Connector As.	2

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249-0581 Lines Gp-Connecting

13***98	Connector	1
14***48	Fitting As; (Quick Disconnect, Male)	1
14***49	Fitting As; (Quick Disconnect, Female)	1
14***18	Connector As	2

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231-4242 Lines Gp-Connecting

14***15	Connector As	4
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
15***95	Fitting As; (Quick Disconnect, Male)	1
23***41	Hose As	2

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231-6146 Lines Gp-Connecting

14***18	Connector As	2
14***27	Connector Group	4
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
15***95	Fitting As; (Quick Disconnect, Male)	1

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231-9855 Lines Gp-Cylinder

11***60	Strap	2
14***18	Connector As	7
14***74	Elbow As	1
23***73	Hose As	2

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231-4378 Lines Gp-Cylinder

14***18	Connector As	2
23***78	Lines Group-Cylinder	1
23***79	Hose As	1
23***74	Hose As	1

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231-5255 Lines Gp-Cylinder

14***18	Connector As	2
23***52	Hose As	1
23***53	Hose As	1
23***55	Lines Group-Cylinder	1

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231-4186 Lines Gp-Motor

09***19	Connector	2
14***18	Connector As	1
14***27	Connector Group	2
16***76	Adapter As	1

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231-4018 Lines Gp-Motor

14***15	Connector As	2
14***41	Connector Group	2
23***17	Hose As	2
23***18	Lines Group-Motor	1

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231-9854 Lines Gp-Motor

12***86	Flange-Split	4
14***27	Connector Group	2
23***71	Hose As	2
23***54	Lines Group-Motor	1

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231-5221 Lines Gp-Motor

09***19	Connector	2
13***98	Connector	2
14***27	Connector Group	2
14***70	Elbow, 90°,-8 Orb Swiv. /-8 Orfs	1

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220-4766 Manifold Gp-Control

22***66	Manifold Group-Control	1
22***20	Valve As	2
23***95	Connector	2
23***77	Manifold	1

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227-7034 Manifold Gp-Control

22***20	Valve As	4
22***34	Manifold Group-Control	1
22***98	Valve Group-Solenoid	3
23***32	Bolt-Socket Head	4

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227-7036 Motor Gp-Gerotor -Basic

22***14	Screw	6
22***36	Motor Group-Gerotor; -Basic	1
25***28	Kit-Seal; (Conveyor Motor)	1

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224-7399 Motor Gp-Piston

22***91	Kit-Seal	1
22***99	Motor Group-Piston	1
22***06	Stud	6
22***07	Nut-Flange	6

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224-7398 Motor Gp-Piston

11***70	Bearing Assembly	1
1T***68	Seal-O-Ring; (Fuel Injection Pump)	1
22***98	Motor Group-Piston	1
22***07	Stud	10

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227-9398 Valve Gp-Solenoid

21***13	Seal-O-Ring	1
21***14	Seal-O-Ring	1
21***73	Cartridge As-Valve	1
21***74	Seal & Retainer As	1

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Service Equipment And Supplies

232-3554 Film Gp

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	1
15***62	Film-Information; (Tie-Down Location)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1

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232-3552 Film Gp

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	1
15***62	Film-Information; (Tie-Down Location)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1

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232-3553 Film Gp

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	1
15***62	Film-Information; (Tie-Down Location)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1

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232-3555 Film Gp

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	1
15***62	Film-Information; (Tie-Down Location)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1

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232-2453 Film Gp

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	1
15***62	Film-Information; (Tie-Down Location)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1

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Work Tool Arrangement

224-7397 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	6
22***66	Hydraulic Ar	1
22***94	Frame Ar	1
22***97	Cold Planer Ar	1

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246-7313 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	13
21***50	Frame Ar	1
22***14	Harness As-Work Tool; (Power)	1
23***55	Film Group	1

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246-7315 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	13
22***94	Frame Ar	1
22***14	Harness As-Work Tool; (Power)	1
23***54	Film Group	1

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219-5400 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	6
21***00	Cold Planer Ar	1
21***50	Frame Ar	1
21***55	Hydraulic Ar	1

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224-7390 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	6
22***88	Frame Ar	1
22***90	Cold Planer Ar	1
22***09	Hydraulic Ar	1

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224-7395 Cold Planer Ar

22***65	Frame Ar	1
22***92	Hydraulic Ar	1
22***95	Cold Planer Ar	1
23***53	Film Group	1

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246-7314 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	13
22***88	Frame Ar	1
22***14	Harness As-Work Tool; (Power)	1
23***53	Film Group	1

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224-7396 Cold Planer Ar

22***92	Hydraulic Ar	1
22***93	Frame Ar	1
22***96	Cold Planer Ar	1
23***52	Film Group	1

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Work Tools

224-7333 Adjustment Gp-Depth

09***91	Pin - Spring	2
21***23	Pin	2
21***24	Bushing	4
22***33	Adjustment Group-Depth	1

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219-5415 Control Gp-Cold Planer

13***45	Spacer; (50.8x60x4.8-mm Thk)	4
21***99	Pin As; (Lh)	1
21***04	Plate	2
21***09	Pin As; (Rh)	1

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224-7361 Control Gp-Cold Planer

13***45	Spacer; (50.8x60x4.8-mm Thk)	4
21***11	Plate-Indicator	1
21***12	Plate-Indicator	1
21***38	Bearing	6

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220-4768 Control Gp-Cold Planer

13***45	Spacer; (50.8x60x4.8-mm Thk)	4
21***38	Bearing	6
21***41	Ring-Retainer	2
22***68	Control Group-Cold Planer	1

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224-7383 Control Gp-Cold Planer

13***45	Spacer; (50.8x60x4.8-mm Thk)	4
21***11	Plate-Indicator	1
21***12	Plate-Indicator	1
21***38	Bearing	6

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224-7386 Drive Gp-Cold Planer

22***86	Drive Group-Cold Planer	1
22***99	Motor Group-Piston	1
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	10
9X***57	Washer-Pipe As To Main Pump Suction Port	10

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220-4767 Drive Gp-Cold Planer

22***67	Drive Group-Cold Planer	1
22***08	Nut; (M14x1.5-Thd)	10
22***36	Motor Group-Gerotor; -Basic	1
23***20	Hub Group-Drive	1

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219-5425 Drive Gp-Cold Planer

1T***68	Seal-O-Ring; (Fuel Injection Pump)	1
21***07	Motor Group-Piston	2
21***08	Plate-Drive	1
21***25	Drive Group-Cold Planer	1

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224-7363 Drive Gp-Cold Planer

22***63	Drive Group-Cold Planer	1
22***98	Motor Group-Piston	1
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	10
9X***57	Washer-Pipe As To Main Pump Suction Port	10

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231-2584 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	42
22***08	Holder-Bit	42
23***84	Drum Group-Cold Planer	1

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231-2581 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	24
22***08	Holder-Bit	24
23***81	Drum Group-Cold Planer	1

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231-2586 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	48
22***08	Holder-Bit	48
23***86	Drum Group-Cold Planer	1

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231-2576 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	42
22***08	Holder-Bit	42
23***76	Drum Group-Cold Planer	1

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231-2588 Drum Gp-Cold Planer

22***08	Holder-Bit	78
22***40	Bit As-Cutter; (Concrete Applications)	78
23***88	Drum Group-Cold Planer	1

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224-7359 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	42
22***59	Drum Group-Cold Planer	1
22***08	Holder-Bit	42
22***40	Bit As-Cutter; (Concrete Applications)	42

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231-2582 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	36
22***08	Holder-Bit	36
23***82	Drum Group-Cold Planer	1

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231-2585 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	48
22***08	Holder-Bit	48
23***85	Drum Group-Cold Planer	1

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224-7360 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	48
22***60	Drum Group-Cold Planer	1
22***08	Holder-Bit	48
22***40	Bit As-Cutter; (Concrete Applications)	48

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231-2572 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	24
22***08	Holder-Bit	24
23***72	Drum Group-Cold Planer	1

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231-2583 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	42
22***08	Holder-Bit	42
23***83	Drum Group-Cold Planer	1

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231-2575 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	42
22***08	Holder-Bit	42
23***75	Drum Group-Cold Planer	1

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224-7384 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	60
22***84	Drum Group-Cold Planer	1
22***08	Holder-Bit	60
22***40	Bit As-Cutter; (Concrete Applications)	60

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231-2573 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	24
22***08	Holder-Bit	24
23***73	Drum Group-Cold Planer	1

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231-2587 Drum Gp-Cold Planer

22***08	Holder-Bit	66
22***40	Bit As-Cutter; (Concrete Applications)	66
23***87	Drum Group-Cold Planer	1

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231-2574 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	36
22***08	Holder-Bit	36
23***74	Drum Group-Cold Planer	1

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231-2580 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	28
22***08	Holder-Bit	28
23***80	Drum Group-Cold Planer	1

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219-5420 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	78
21***20	Drum Group-Cold Planer	1
22***08	Holder-Bit	78
22***40	Bit As-Cutter; (Concrete Applications)	78

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231-2577 Drum Gp-Cold Planer

21***06	Bit As-Cutter; (Standard)	42
22***08	Holder-Bit	42
23***77	Drum Group-Cold Planer	1

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231-2579 Drum Gp-Cold Planer

22***08	Holder-Bit	66
22***40	Bit As-Cutter; (Concrete Applications)	66
23***79	Drum Group-Cold Planer	1

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231-2592 Spray Gp-Water

11***19	Bolt-Socket Head; (M4x0.7x25-mm)	4
12***56	Clamp-Hose	12
17***92	Coupling	1
23***92	Spray Group-Water	1

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231-2591 Spray Gp-Water

11***19	Bolt-Socket Head; (M4x0.7x25-mm)	2
12***56	Clamp-Hose	8
17***92	Coupling	1
23***91	Spray Group-Water	1

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231-2590 Spray Gp-Water

11***19	Bolt-Socket Head; (M4x0.7x25-mm)	2
12***56	Clamp-Hose	6
17***92	Coupling	1
23***90	Spray Group-Water	1

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PC203 serial number reference

The PIN/serial plate on the PC203 is riveted to the tool's main frame, typically near the hydraulic quick-couplers or on the top mounting plate that bolts to the carrier's coupler, not on the drum housing itself. Read the first three characters as the letter prefix (PCB for this line) and the digits that follow as the sequential unit number. Open the frame area around the hose connections and mounting plate if the plate is not immediately visible, since paving debris can obscure it.

Prefix	Identifies	Notes
PCB	PC203 cold planer, earlier-generation build in the PC203/204/205/206/210 family, predating Cat's later B-series high-flow renumbering seen on siblings like PC205B	PCB1-Up covers the documented production run of the PC203 as its own model in the shared PC203/PC204/PC205/PC206/PC210 parts catalog; no separate PCB sub-range or split turned up. It is a passive hydraulic work tool with no engine of its own, running off the carrier's hydraulic system: skid steer loader, multi-terrain loader, compact track loader, compact wheel loader, or backhoe loader. A factory conversion kit exists to adapt PCB-prefix (and RDG-prefix) tools, described as A/B/C-series compatible work tools, onto newer D-series carriers, confirming PCB as an earlier-generation build needing that adapter. Drum cutting width is 350 mm (14 in) per factory spec sheet and dealer listings. Plant/region of manufacture and firm model years are not documented in available sources; confirm with a dealer if needed.

Frequently asked questions

What engine does the Cat PC203 cold planer have?

None. The PC203 is a passive hydraulic attachment with no engine, ECM, or transmission of its own. Its gerotor drum motor is driven entirely by the host carrier's auxiliary hydraulic circuit, roughly 55-100 L/min (14-26 gal/min) at 160-240 bar (2,320-3,480 psi), so its cutting performance depends on the carrier it's mounted to.

What is the operating weight of the Cat PC203?

The standard PC203, fitted with its 350 mm (14 in) cutting drum, weighs approximately 650 kg (1,433 lb). Actual weight varies slightly by bit type and any optional wear components fitted.

What replaced the Cat PC203 cold planer?

No source confirms a direct one-to-one successor. The PC203 belongs to an older Cat Cold Planer family alongside the PC204, PC205, PC206, and PC210. Caterpillar's current cold-planer catalog centers on the newer PC104/PC105 standard-flow line, which functions as the modern equivalent class rather than a documented replacement for the PC203 specifically.

What PC203 owners discuss

Does the PC203 need a high-flow carrier, or will standard flow work?

Owners consistently report that cold planers of this size want the higher auxiliary flow rating, not the standard-flow circuit. On a flow-starved carrier the drum spins up slowly, bogs the moment the bits touch pavement, and stalls under load instead of cutting through it. Running it flow-starved for any length of time cooks the gerotor motor with heat it was never meant to see. If your skid steer, MTL, CTL, or backhoe loader is standard flow only, expect poor productivity and shortened attachment life rather than a clean mill.

How often do the drum bits (picks) need replacing, and what does normal wear look like?

This is the single most common maintenance topic among operators. Picks should spin freely in their holders — a pick that stops rotating wears a flat spot fast and loses cutting efficiency well before it looks obviously worn. Outer-row bits on the drum wear first since they do the most cutting on each pass. Typical service life runs roughly 50-150 hours in asphalt and drops sharply, to roughly 10-30 hours, in concrete or reclaimed base material — actual life varies a lot with material hardness and how much reinforcing wire or aggregate you're chewing through. Broken teeth from hitting limestone, rebar, or buried debris are a routine complaint, not a defect.

What hydraulic hose, coupler, or motor problems come up most on these attachments?

The gerotor drive motor and its hose/coupler connections are the main wear items owners flag. Leaks tend to show up at the motor case seal and at the quick-couplers where the attachment plumbs into the carrier's auxiliary circuit — repeated connect/disconnect cycles wear the coupler faces until they weep. A motor that runs hot or loses drum torque under load is more often a symptom of flow mismatch or a marginal carrier pump than a motor defect outright. Because a failed hydraulic line under pressure can whip or spray hot oil, have your dealer verify hose condition and torque on any fitting you disturb before returning the tool to service.

How does the sideshift and depth-skid system behave, and what wears out there?

The PC203 sideshifts hydraulically to work close to curbs and walls, and the depth/moldboard skids float to follow the pavement contour rather than staying rigid. Reported wear points are the sideshift slide rails or flat-bar guides, the depth-skid plates themselves (they're a wear item, not a structural part), and the sideshift cylinder rod — pitted or flaking chrome on the rod is what eventually chews up the rod seal and starts a slow weep. Keeping these points greased on schedule is the fix operators cite most often for sluggish or binding sideshift travel.

Are there drum bearing or seal issues to watch for on cold planers this size?

Drum-end bearing and seal wear shows up as oil weeping from the drum housing or increased play when you rock the drum by hand with the attachment off the ground. Because the drum housing also acts as a low-pressure vent path protecting the motor's shaft seal, a plugged or damaged vent is a contributing factor mechanics look for when a motor seal fails prematurely. Side skirts and the drum housing itself take abrasion damage over time; scored or thinned skirt plate is a wear-and-tear item, not something to leave for next season.

Do these attachments ever have carrier compatibility or electrical issues?

Yes — this comes up often enough that dealers call it out directly. Mismatches between the attachment's auxiliary-hydraulic detent/interlock wiring and a given carrier's electrical system can require adapter harnesses or modification to get the attachment to engage and hold flow correctly. This is a carrier-pairing issue rather than a defect in the tool itself, but it's worth confirming compatibility with your specific host machine's model and hydraulic package before assuming a won't-engage complaint is a broken attachment.

What should I check when buying a used PC203?

Focus on the wear items, not the frame. Check bit wear and rotation in every holder (seized, flat-spotted picks mean the previous owner ran it hard between services); inspect the drum housing and side skirts for thin or scored abrasion damage; look for oil staining or weeping around the gerotor motor, its hose couplers, and the drum-end seals; rock the drum by hand for bearing play; and check the sideshift rails, depth-skid plates, and sideshift cylinder rod for pitting or scoring. Confirm the mount plate and pins show no elongation or cracking from carrier hookups. Because a compromised hydraulic line or a worn mount plate is a safety issue under load, have your dealer verify hose integrity and mount condition before putting a used unit into daily work.

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

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