Caterpillarwork toolcold planer

Caterpillar PC6

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar PC6 is a passive high-flow cold planer work tool built for skid steer loaders, not a self-propelled machine and not powered by an engine of its own. It carries no onboard engine, ECM, fuel tank, or independent hydraulic reservoir; a variable-speed axial-piston hydraulic motor and a double-reduction planetary gearbox inside the drum draw all their power from the carrier's high-flow auxiliary circuit (95-125 L/min at 193-345 bar / 25-33 gpm at 2800-5000 psi). Cat catalogued the PC6 within a legacy Cold Planers - Skid Steer Loader Work Tools lineup, per the Caterpillar work tool specalog dated 1999-2000, alongside the PC3, PC4, and PC9: the PC3 and PC4 covered standard-flow carriers, while the PC6 and PC9 stepped up to high-flow circuits and wider drums. Operating weight is 900 kg (1984 lb) with an overall footprint of 1320 x 1676 x 810 mm (52 x 66 x 32 in), maximum cutting width 610 mm (24 in), and cut diameter 549 mm (21.6 in), mounted through Cat's mechanical wedge quick-coupler. The approved carrier is the Cat 248 skid steer loader at full capability, with the Cat 228 acceptable under a reduced lift-height restriction; standard-flow loaders such as the 216, 226, 236, and 246 are not approved to run it. The unit ships in one configuration, with hydraulic depth and tilt adjustment (±15°) and hydraulic sideshift (roughly 600 mm / 23.6 in of travel) controlled from the carrier cab.

Within the legacy lineup, the split between the standard-flow PC3/PC4 pair and the high-flow PC6/PC9 pair tracked the broader move toward higher auxiliary hydraulic output on skid steer loaders: as carriers like the 248 offered more flow and pressure, Cat sized the PC6 drum and motor to use it, delivering a deeper cut and faster bit speed than the standard-flow tools. Cat's current work tool catalog has since moved to a differently numbered cold planer range, including the PC104/PC105, PC204/PC205/PC206, and PC305 through PC412 families, so the PC6 no longer sits in active production, though no single documented model replaces it one-for-one. In the used and parts market, that leaves the PC6 relevant mainly to owners still running older 248- or 228-class skid steers who need a working high-flow planer without buying into current-generation pricing. Demand centers on wear items, bits, bit holders, skid shoes, and coupler wedge hardware, since the drum, gearbox, and drive motor are built to outlast them under normal use.

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 PC6 specifications

Engine

Power source	No onboard engine. PC6 is a passive skid steer work tool driven entirely by the host machine's high-flow auxiliary hydraulic circuit.
Drive system	Variable-speed, uni-directional axial piston hydraulic motor mounted directly to a double-reduction planetary gearbox inside the drum.
Host machine requirement	Requires high-flow auxiliary hydraulics; matched to Cat 228 and 248 skid steer loaders (and later high-flow-equipped skid steer models) via the mechanical quick coupler.
Emissions tier	Not applicable — no engine on the work tool itself.

Weights

Operating weight	900 kg (1984 lb)
Ground pressure	Not published as a numeric figure. Four pivoting skids are stated to limit ground pressure and provide a stable planing platform, but Caterpillar does not publish a ground-pressure spec for this attachment.

Dimensions

Overall width	1676 mm (66 in)
Overall length	1320 mm (52 in)
Overall height	810 mm (32 in)
Maximum drum (cutting) width	610 mm (24 in)
Cut diameter	549 mm (21.6 in)
Sideshift travel	600 mm (23.6 in), hydraulically controlled from the operator's compartment
Tilt angle range	±15°, hydraulically controlled

Performance

Maximum depth of cut	152 mm (6 in) in asphalt; rated for high-production planing to depths greater than 76 mm (3 in) in asphalt and up to 16 mm (0.63 in) in concrete
Drum speed at max flow	171 rpm
Bit (cutting) speed at max flow	296 m/min (969 ft/min)
Drum torque at max pressure	4015 N·m (2952 lb-ft)
Required hydraulic flow range	95-125 L/min (25-33 gpm)
Optimal hydraulic pressure range	193-345 bar (2800-5000 psi)
Travel/drive speed	Not applicable — the PC6 has no self-propulsion; travel speed is governed entirely by the host skid steer loader.

Service capacities (summary)

Fuel tank	Not applicable — no engine on the attachment.
Engine oil	Not applicable — no engine on the attachment.
Cooling system	Not applicable — no engine on the attachment.
Hydraulic system	No independent hydraulic reservoir; the PC6 runs off the host skid steer loader's high-flow auxiliary hydraulic system and shares that machine's hydraulic fluid and reservoir.

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

PC6 fluids & capacities

System	Capacity	Recommended fluid
Engine, cooling system, fuel tank	Not applicable	PC6 is a passive skid steer/compact track loader work tool (cold planer) with no onboard engine, no cooling system, and no fuel tank. It draws all power from the carrier machine's engine; there is no engine oil, coolant, or fuel chart for this attachment.
Hydraulic system and tank (attachment)	No dedicated reservoir on the planer itself. Runs on the carrier's high-flow auxiliary circuit: required flow 95-125 L/min (25-33 US gpm), optimal pressure 193-345 bar (2800-5000 psi)	The planer has no hydraulic tank of its own; hydraulic oil is supplied and specified by the carrier skid steer or compact track loader (per that machine's own OMM fluid chart, typically Cat multigrade hydraulic oil selected by ambient-temperature viscosity chart). PC6 requires a high-flow carrier (for example Cat 228 or 248 class); standard-flow carriers are not approved.
Transmission, final drives, axles	Not applicable	The work tool has no transmission, final drive, or axle assemblies. Drive is a single planetary reduction gearbox mounted inside the cutting drum (see next row).
Planetary reduction drive gearbox (drum-mounted)	Not documented in available sources for this exact configuration; verify fill quantity against the machine's own OMM lubricant chart or with your dealer	Drive is a variable-speed axial-piston hydraulic motor mounted directly to a double-reduction planetary gearbox inside the drum. Cat work-tool gear cases of this type typically spec a Cat GO-grade (GL-5-class) multipurpose gear oil; exact grade and viscosity-by-climate breakout specific to PC6 was not found in publicly available documentation and should be confirmed against the attachment's serial-specific OMM.
Grease points (quick-coupler, tilt, sideshift pivots)	Grease per scheduled interval; no reservoir volume specified	Pivot pins, hydraulic tilt cylinders, and sideshift linkage take a standard multipurpose lithium-complex grease (Cat Multipurpose Grease type) at scheduled greasing intervals. No cold-weather/hot-weather grease grade split specific to PC6 was found in available sources.

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

Caterpillar PC6 maintenance schedule

Service interval	Tasks
Every 10 h	Inspect every bit for a worn or flattened cutting tip and confirm each bit still spins freely in its holder; replace bits that no longer rotate. Check bit holders for cracks, looseness, or rounded wear; holders wear out faster than the bits they carry. Walk down both skid shoes and confirm even wear against the drum housing; adjust or flag shoes wearing unevenly. Inspect hydraulic hoses, quick-couplers, and fittings for leaks, abrasion, or kinks before engaging the carrier's high-flow circuit. Check the coupler wedge and mounting pins for play; retighten or replace worn wedge hardware before operating. Confirm carrier hydraulic oil level and cooler condition per the skid steer loader's own weekly service schedule.
Every 250 h	Drain and inspect planetary gearbox oil condition inside the drum; change the oil, following general practice for this class of hydraulic drum attachment where a PC6-specific factory interval is not documented. Grease the coupler, tilt cylinder, and sideshift pivot points with Cat multipurpose grease. Inspect the drum housing and end plates for cracking or bent flanges from impact with curbs or hard debris. Check sideshift travel and cylinder seals for leakage across the full stroke. Torque-check bit holder base retention and coupler wedge fasteners.
Every 500 h	Change planetary gearbox oil if not already serviced at the shorter interval; inspect the oil at the drain plug for metal contamination or pitted gear debris. Inspect the hydraulic drive motor input coupling and shaft seal for wear or seepage. Measure drum wear against the nominal 549 mm (21.6 in) cut diameter and flag advanced wear for bit and shoe resizing. Inspect tilt cylinder mounting pins for elongation or play. Re-torque structural coupler and frame fasteners.
Every 1,000 h	Remove drum end covers and inspect the internal planetary gear train for tooth wear or contamination in the gear oil. Check the hydraulic drive motor for internal leakage or falling output torque as flow demand increases. Inspect drum shaft bearings and seals for play or oil migration into the bearing cavity. Inspect the frame and wedge coupler mounting points for fatigue cracking.
Every 2,000 h	Pull the hydraulic drive motor for shop inspection or exchange if drum speed or torque has visibly degraded. Replace drum shaft bearings and seals as a set rather than individually. Evaluate skid shoes, bit holders, and drum wear components together for full-set replacement. Inspect wedge coupler faces and pins for cumulative wear and rebush or replace as needed.
Every 4,000 h	Overhaul or exchange the planetary reduction gearbox as a complete unit. Rebuild the drum assembly, including bearings, seals, and holder base plates. Recondition or replace the wedge coupler frame if wear exceeds mounting tolerance. Reassess remaining service life of the drivetrain and structure against continued high-flow duty cycles.

Servicing the PC6 beyond the schedule

Predictive Maintenance & Fluid Analysis

The PC6 carries no engine oil, fuel, or coolant of its own; its only dedicated fluid is the planetary gearbox oil inside the drum. Sample that oil periodically for metal particulate as an early warning of gear or bearing wear. Because the PC6 has no ECM, hydraulic flow and pressure faults surface only on the carrier skid steer loader's own diagnostic display (Cat ET or Cat Central), so track carrier auxiliary-circuit pressure and temperature trends for early signs of motor or hose degradation before drum performance actually drops.

Corrective & Common Repairs

Most PC6 repairs are wear-item swaps rather than drivetrain work. Replace bits once cutting tips flatten or holders no longer let them spin freely; expect holders to wear out faster than the bits themselves and to need earlier replacement. Skid shoes are a designed wear item and should be replaced, not built up, once they thin unevenly against the drum housing. Coupler wedge and pin play is a common complaint on older units; tighten or replace worn wedge hardware before it lets the tool shift in the quick-coupler mid-cut.

Overhaul & Rebuild Points

Overhaul work on the PC6 centers on the drum's internal planetary reduction gearbox and the axial-piston drive motor feeding it, both stressed by continuous high-flow operation at up to 345 bar (5000 psi). Plan on gearbox teardown or exchange, drum shaft bearing and seal replacement, and motor rebuild or swap once case-drain leakage rises or output torque falls off. Inspect the wedge coupler frame at the same time; cumulative pin and wedge-face wear there is the other structural point that eventually needs rebushing or full frame replacement.

Seasonal & Environment Servicing

Cold starts affect the PC6 indirectly through the carrier's hydraulic oil viscosity; let the skid steer loader's auxiliary circuit warm before pushing the drum to full 152 mm (6 in) depth, since cold, thick oil slows drum speed and can lug the motor under load. In freezing conditions, drain water from quick-couplers and cap open fittings between jobs to keep ice and grit out of the circuit. In hot, abrasive asphalt milling, expect faster bit and holder wear and check skid shoes more often, since fine debris accelerates wear on both.

PC6 attachments & work tools

Cutting bit options

Standard drum carries all-purpose conical bits for general asphalt and pavement milling. An optional concrete bit pattern is offered for aggressive concrete removal. Bits are field-replaceable with hand tools.

Coupler / mounting interface

PC6 mounts to the Cat skid steer loader's integrated mechanical quick coupler using an opposing-wedge interface for fast, secure tool changes. Auxiliary hydraulics connect through quick disconnects with hose routing sized and sleeved for the high-flow circuit.

Hydraulic power requirement

PC6 is a high-flow work tool: it needs an auxiliary flow of roughly 95-125 L/min (25-33 gpm) at an optimal pressure around 193-345 bar (2800-5000 psi), varies by carrier configuration. It will not function on standard-flow circuits.

Approved carrier machines

Cat's own compatibility chart lists the 248 skid steer loader for optimum performance and the 228 for acceptable performance (with a lift-restriction: do not raise the tool hinge pin above about 1 m/3 ft, tipping risk). Standard-flow loaders such as the 216, 226, 236, and 246 are not approved for the PC6.

Depth, tilt and sideshift control

Depth and tilt are hydraulically adjusted from the cab via an electrohydraulic valve, with a tilt range of about ±15 degrees. Hydraulic sideshift, standard on the model, gives roughly 600 mm (23.6 in) of travel for planing tight to curbs and walls, and is operated from the operator's compartment auxiliary circuit selector.

Drivetrain configuration

Drum drive uses a variable-speed, unidirectional axial-piston hydraulic motor mounted to a double-reduction planetary gearbox inside the drum, giving higher torque than the direct-drive gerotor motors used on the smaller standard-flow siblings.

Guarding and skid arrangement

Four pivoting skids support the chassis for stability and reduced ground pressure. Side guards are integrated into the two front skids to keep milled spoils contained within the cut, a feature shared with its larger high-flow sibling but not fitted to the smaller standard-flow siblings.

Dust suppression option

An optional water sprinkler kit is available for dust suppression during milling, offered across the cold-planer skid-steer lineup including this class.

Class position and current-generation note

PC6 (610 mm/24 in max drum) sits above the standard-flow PC3/PC4 pair and below the larger high-flow PC9 (812 mm/32 in) in its original lineup. This legacy series has since been superseded in Cat's current catalog by a differently-numbered cold-planer range for skid steers, track loaders and compact wheel loaders; treat any specs from that newer range as a different model, not a direct PC6 match.

All PC6 assemblies by section

Every catalogued assembly group for the Caterpillar PC6. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

173-6665 Frame Gp-Cold Planer

02***87	Fitting-Grease; (Universal Joint)	2
14***66	Skid As	2
16***90	Latch	2
17***65	Frame Group-Cold Planer	1

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168-8568 Frame Gp-Cold Planer

02***87	Fitting-Grease; (Universal Joint)	11
03***53	Ring-Retaining	2
14***67	Pin	1
16***89	Spacer; (52.3x63.5x16-mm Thk)(19mm Thk)	1

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173-6664 Frame Gp-Cold Planer

02***87	Fitting-Grease; (Universal Joint)	11
03***53	Ring-Retaining	2
14***67	Pin	1
16***89	Spacer; (52.3x63.5x16-mm Thk)(19mm Thk)	1

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168-8570 Frame Gp-Cold Planer

02***87	Fitting-Grease; (Universal Joint)	2
14***66	Skid As	4
16***90	Latch	2
16***69	Housing As	1

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Hydraulic System

168-8566 Cylinder Gp-Hydraulic

16***66	Cylinder Group-Hydraulic	1
16***77	Kit-Seal	1

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168-8563 Cylinder Gp-Hydraulic

16***63

Cylinder Group-Hydraulic

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180-3768 Cylinder Gp-Hydraulic

18***68

Cylinder Group-Hydraulic

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147-6781 Cylinder Gp-Hydraulic

00***14	Ring-Retaining; (Internal)	1
14***81	Cylinder Group-Hydraulic	1
16***77	Kit-Seal	1

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173-6661 Hydraulic Ar

14***81	Cylinder Group-Hydraulic	1
15***69	Manifold Group-Control; -Sideshift-Tilt-Dept-Sideshift-Tilt-Depth	1
16***63	Cylinder Group-Hydraulic	1
16***64	Lines Group-Connecting	1

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173-6662 Lines Gp-Connecting

12***33	Elbow	2
14***17	Adapter, -12 Orb / -16 Orfs	2
14***18	Connector As	2
15***97	Fitting As; (Quick Disconnect, Female)	1

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168-8564 Lines Gp-Connecting

14***19	Connector As	2
14***25	Connector As.	16
14***48	Fitting As	2
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1

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155-5569 Manifold Gp-Control -Sideshift-Tilt-Dept-Sideshift-Tilt-Depth

11***04	Kit-Seal; (Check Valve)	1
12***57	Valve Group-Check	1
15***69	Manifold Group-Control; -Sideshift-Tilt-Dept-Sideshift-Tilt-Depth	1
15***76	Manifold As	1

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170-8708 Valve Gp-Solenoid

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
15***70	Nut; (1/2-20-2b-Thd)	2
17***07	Cartridge As	1
17***08	Valve Group-Solenoid	1

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170-8710 Valve Gp-Solenoid

10***02	Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness)	1
15***70	Nut; (1/2-20-2b-Thd)	2
17***09	Cartridge As	1
17***10	Valve Group-Solenoid	1

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Service Equipment And Supplies

185-0880 Kit-Roading Plate & Mounting

17***14	Film-Stripe; (Reflective, Red, White)	2
17***42	Guard	2
18***80	Kit-Roading Plate & Mounting	1
18***41	Guard	1

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180-4845 Plate & 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)	3
15***36	Film-Warning; (Read Operation Manual)	1

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173-6667 Plate & Film Gp

12***56	Film; (Warning) (No Step) (On Top Of Hood Behind Cab On Each Side) (On Each Fender Flare)	1
15***15	Plate-Identification	1
15***62	Film-Information; (Tie-Down Location)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	3

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Work Tool Arrangement

168-8560 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	5
16***94	Harness As-Work Tool	1
16***60	Cold Planer Ar	1
16***68	Frame Group-Cold Planer	1

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173-6658 Cold Planer Ar

15***70	Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness)	5
16***94	Harness As-Work Tool	1
17***58	Cold Planer Ar	1
17***59	Drive Group-Cold Planer	1

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Work Tools

173-6659 Drive Gp-Cold Planer

01***15	Setscrew-Socket; (1/2-13x0.5-In)(1/2 Thd)	2
14***36	Nut; (9/16-18-Thd)	9
15***63	Kit-Seal	1
16***03	Shaft As	1

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173-6666 Drum Gp-Cold Planer

13***78	Bit As-Cutting; (Standard)	70
14***63	Bit As-Cutting; (Concrete)	70
15***55	Stud	4
17***66	Drum Group-Cold Planer	1

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168-8573 Drum Gp-Cold Planer

13***78	Bit As-Cutting; (Standard)	85
14***63	Bit As-Cutting; (Concrete)	85
15***55	Stud	4
16***73	Drum Group-Cold Planer	1

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189-8642 Kit-Water Spray

00***86	Connector-Hose (1/4-18nptf Thd)	1
12***56	Clamp-Hose	1
17***92	Coupling	1
17***49	Tee	5

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Frequently asked questions

What engine does the Caterpillar PC6 have?

None. The PC6 is a passive work tool with no onboard engine, ECM, or fuel tank. Its cutting drum is driven by a variable-speed hydraulic motor powered entirely by the carrier skid steer loader's high-flow auxiliary hydraulic circuit.

What is the operating weight of the Caterpillar PC6?

The PC6 weighs 900 kg (1984 lb) as mounted, with an overall footprint of about 1320 x 1676 x 810 mm (52 x 66 x 32 in).

What replaced the Caterpillar PC6?

Cat's current work tool lineup uses a differently numbered cold planer range, including the PC104/PC105, PC204/PC205/PC206, and PC305 through PC412 families, rather than a single documented one-for-one successor to the legacy PC3/PC4/PC6/PC9 series.

What PC6 owners discuss

What kind of skid steer or track loader do you need to run a PC6 cold planer?

The PC6 is a high-flow-only work tool — it needs a carrier that can supply roughly 95-125 L/min (25-33 gpm) at 193-345 bar (2,800-5,000 psi) on the auxiliary circuit. A standard-flow loader won't spin the drum fast enough to cut cleanly and may not fully engage the tool at all. Owners generally pair the PC6 with the largest high-flow skid steer or CTL they have, since the reaction torque of a 610 mm (24 in) drum and the added weight of the tool benefit from a heavier, more stable carrier.

Why does the drum sometimes bog down or stall when you adjust depth mid-cut?

This shows up across high-flow planers generally, not just the PC6: depth and tilt adjustment often share the same hydraulic circuit that spins the drum. Crank depth or tilt while milling and you're pulling flow away from the cutting motor — on shallow cuts around 50 mm (2 in) that's frequently enough to stall the drum outright. The usual fix operators use is to stop, make the adjustment, then resume the pass instead of adjusting on the fly. Have your dealer verify your carrier's flow-sharing setup if the drum stalls even on light cuts.

How is sideshift and tilt actually controlled on a PC6?

Unlike the smaller PC3/PC4, which use a manual selector valve and a screw-jack or spring for tilt, the PC6 controls both sideshift and tilt hydraulically from the operator's seat. Sideshift specifically runs off the standard-flow auxiliary circuit rather than the high-flow circuit driving the drum — worth knowing when troubleshooting a sideshift that won't move, since the fault is more often in the standard-flow lines/couplers than the high-flow side.

What wears out first on a PC6 — bits, holders, or the drum itself?

Carbide bits go first, especially milling abrasive concrete or gritty asphalt. Conical bits are meant to spin freely in their holders, and that rotation is what keeps wear even around the tip; once a bit stops rotating (packed with debris, or a worn holder) it flats out fast on one side. Bit holders/pockets wear next and eventually need weld buildup or replacement, a heavier job than a bit swap. The drum shell and skid shoes typically outlast both if the machine isn't run with bits worn past their useful life.

What should you check on the planetary drive gearbox?

The drum runs off a direct planetary drive gearbox, which is what gives the PC6 its cutting torque compared to a straight motor-to-drum setup. Gearbox oil changes are the maintenance item most commonly skipped, then paid for later — a rough interval mentioned by operators is an early service around 100 hours, then roughly every 250 hours after. Leaks tend to show up at a shaft seal or bearing area; a light weep isn't unusual, but a steady drip or metal in the drained oil points to bearing wear. Have your dealer verify gearbox condition before it's run low or contaminated.

Do the skid shoes need much attention?

The pivoting skid shoes are a deliberate wear item — bolted on and replaceable so the drum housing itself doesn't take the abrasion. Check that the shoes still sit parallel to the ground; if they wear unevenly, the drum won't hold a consistent depth side to side and cut quality suffers before the shoes look obviously worn out.

What should you inspect before buying a used PC6?

Buyers generally walk through five things: bit and holder condition (bits should spin freely, holders shouldn't be egg-shaped or covered in prior weld repairs), drum condition and any bent or missing bit pockets, gearbox oil condition plus any seal leakage or drum play/wobble when rocked by hand, skid shoe wear and whether they still sit parallel and adjust properly, and the quick-coupler wedges/pins and hydraulic quick-connects for play that would let the tool shift on the carrier. A planer run with dull bits chews through holders and drum pockets fast, so mismatched wear between the bits and everything downstream is a red flag. Have your dealer verify gearbox and drum condition on any used unit before you commit.

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

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