Caterpillarwork toolcrusher

Caterpillar CR28

Maintenance schedule, common problems & OEM parts breakdown

The Cat CR28 is a boom-mounted hydraulic concrete crusher/pulverizer, not a self-propelled machine. It has no engine, no undercarriage, and no onboard electronics; it runs entirely off the hydraulic circuits of the excavator it is pinned to. Service weight is approximately 3,100 kg (6,850 lb) excluding the mounting bracket, placing it in the mid-size tier of Caterpillar's CR-series demolition tools, between the smaller CR20 and the larger CR35 and CR50. Caterpillar matched the CR28 to 325B, 330B, 345B, and 350 excavators, in roughly the 28,000 kg (62,000 lb) base-machine weight class, with stick-mount reach ranging from about 2.0 to 3.2 m (6 ft 7 in to 10 ft 6 in) on the 325B up to 4.8 m (15 ft 9 in) on reach-boom 345B and 350 setups. The tool dates to the CR-series catalog era of the mid-to-late 1990s into the early 2000s. It runs replaceable alloy crusher teeth, rotatable rebar cutter edges, rod-fed crushing cylinders, and a continuous 360-degree top rotator, in a fixed-jaw pulverizing and rebar-cutting configuration with no interchangeable jaw sets.

Within the CR-series, size is the main variable across the lineup: the CR20 is scaled for 320B/322B carriers, the CR28 steps up for 325B/330B/345B/350 carriers, and the CR35 and CR50 climb further for 345B/350 and 375-class machines. All four share the same rod-fed cylinder layout, top-rotator design, and bolt-on or weld-on tooth system, so CR28 maintenance and wear logic carries across the family at different scale. Caterpillar's later demolition-attachment generations moved to interchangeable-jaw multi-processors and, more recently, to dedicated primary and secondary pulverizers; these are the functional successors to the job the CR28 did, though not a badge-for-badge replacement. In today's used and parts market, the CR28 still turns up on older mid-size demolition and concrete-recycling fleets. Buyers value it for low-cost rebar-cutting and pulverizing capacity on carriers already sized to run it, while wear parts (teeth, cutter edges, pins, bushings, cylinder seals) are the main consumable and sourcing concern given its age.

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 CR28 specifications

Engine

Power source

No onboard engine. CR28 is a boom-mounted hydraulic concrete crusher attachment. It draws all hydraulic flow and pressure from the host excavator's own hydraulic system.

Weights

Service weight (excl. mounting bracket)	3,100 kg (6,850 lb) per factory spec sheet. Some spec aggregators list approx. 3.3 t (7,275 lb), likely including the mounting bracket/adapter weight.
Ground pressure	Not applicable / not published. CR28 is a carrier-mounted attachment, not a self-propelled machine.

Dimensions

Overall length (excl. mounting bracket)	2,320 mm (91.3 in)
Jaw opening, maximum	915 mm (36.0 in)
Jaw depth	750 mm (29.5 in)
Cutter width	400 mm total, two 200 mm cutters (15.8 in total, two 7.9 in cutters)

Performance

Maximum crushing force, tip	784 kN (88 ton)
Maximum crushing force, middle tooth	1,088 kN (122 ton)
Maximum shearing force, cutting center	3,080 kN (346 ton)
Cycle time	Approx. 4.8 sec. Varies with carrier configuration and operating conditions.
Rotation	Continuous 360 degree, top-mounted hydraulic rotator with pressure relief valve and accumulators to protect the carrier stick/boom.
Carrier compatibility	Matched to Cat 325B, 330B, 345B, and 350 excavators, base machine operating weight class approx. 28,000 kg (62,000 lb). Stick range varies by carrier, roughly 2.0-4.8 m (6'7" - 15'9").
Demolition capacity	Rated for reinforced concrete structures (bridge decks, parking garages, support columns, abutments) up to approx. 150 cm (5 ft) thick or in diameter. Throat-mounted cutters shear rebar and light steel profiles without torching.

Service capacities (summary)

Maximum hydraulic oil flow, crushing cylinder	350 L/min (93 gpm)
Maximum hydraulic oil flow, rotation	20 L/min (5 gpm)
Maximum working pressure, crushing cylinder	34,300 kPa (4,980 psi)
Maximum working pressure, rotation	17,200 kPa (2,465 psi)
Fuel tank / engine oil / cooling system	Not applicable. The attachment has no engine of its own; it runs on the host excavator's hydraulic and fuel systems.

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

CR28 fluids & capacities

System	Capacity	Recommended fluid
Hydraulic system (crushing cylinders and rotator motor)	No dedicated tank on the tool itself. The CR28 has no hydraulic reservoir of its own; it draws oil from the host excavator's hydraulic system (325B, 330B, 345B, and 350 carriers, depending on stick configuration). Crushing-cylinder circuit is rated for oil flow up to 350 L/min (92 US gpm) at a maximum working pressure of 34 300 kPa (4980 psi). Rotator circuit flow is 20 L/min (5 US gpm) at a maximum working pressure of 17 200 kPa (2465 psi).	Runs on whatever hydraulic fluid the host carrier's own system uses; the crusher has no separate fluid spec of its own. Match the excavator's OMM fluid recommendation (typically a Cat multi-viscosity, all-season hydraulic oil) rather than a CR28-specific fluid. No standalone CR28 document was found calling out a distinct hydraulic fluid grade; confirm against the carrier's own operation and maintenance manual and with your dealer.
Grease points (crushing-arm pins, cylinder pins, rotator bearing and bushings)	Not applicable. Lubricated through grease fittings only; there is no fill volume or reservoir capacity for these points.	General-purpose Cat pin and bushing lubricant for work-tool attachments of this type is a lithium-complex grease with molybdenum disulfide, NLGI 2, suited to an ambient range of roughly -20 to 40 degrees C (-4 to 104 degrees F). For sustained sub-zero operation, a cold-weather-rated Cat grease is the usual substitute. No CR28-specific grease brand or interval was found in a standalone document for this attachment; confirm the exact interval and grease grade with your dealer or the crusher's own maintenance literature.

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

Caterpillar CR28 maintenance schedule

Service interval	Tasks
Every 50 h	Inspect hoses, fittings, and cylinder rod seals for leaks before starting work each day. Check crusher teeth, rebar cutter edges, and cutting surfaces daily for cracks or heavy wear. Grease the rotator bearing and pivot pins weekly; increase frequency in dusty or wet conditions. Check mounting bracket bolts and pin retainers for looseness weekly. Clear concrete dust and debris from rotator seals and pivot joints daily. Cycle the jaws through a full open-close stroke and a full rotation daily to check for binding or abnormal noise.
Every 250 h	Inspect hydraulic cylinder rods for scoring, pitting, or external leakage. Measure pivot pin and bushing clearance; replace any pin or bushing beyond the service limit. Torque-check mounting bracket and rotator ring bolts to specification. Index or replace worn rebar cutter edges before the cutting edge is fully consumed. Inspect the rotator circuit's accumulator pre-charge.
Every 500 h	Inspect crusher teeth for wear; build up or replace teeth showing heavy wear. Inspect the rotator slewing ring and gear teeth for wear, pitting, or backlash. Check cylinder swivel bearings for play and lubricate to specification. Inspect structural welds on the jaw arms and mounting ears for cracking. Check hydraulic hose routing and clamps for chafing against the frame.
Every 1,000 h	Remove and inspect cylinder seals; replace any seal showing wear or leakage. Inspect the rotator motor for internal leakage and confirm output torque. Replace worn pivot pins and bushings at all wear points. Verify the rotator circuit's pressure relief valve is set to specification. Run a dye-penetrant or crack-check inspection on the frame and jaw structure.
Every 2,000 h	Rebuild the crushing cylinders: seals, rod condition, and swivel bearings. Overhaul or replace the rotator motor and slewing bearing assembly. Replace the rebar cutter edges and crusher teeth as a set regardless of visible wear. Re-torque all structural fasteners and replace any stretched or corroded bolts. Send the frame and jaw castings for a full NDT crack inspection before returning to service.
Every 4,000 h	Perform a complete teardown and rebuild of the rotator gearbox and bearing assembly. Replace the slewing ring bearing and its mounting bolts as a set. Inspect jaw pivot bores for wear; line-bore or bush oversized bores. Recondition or replace the crushing cylinders as part of a full structural rebuild. Recoat the structure and verify structural integrity before returning the tool to service.

Servicing the CR28 beyond the schedule

Predictive Maintenance & Fluid Analysis

The CR28 has no engine or reservoir of its own; it draws hydraulic power from the carrier, so predictive checks center on the tool's effect on that shared circuit. Sample the carrier's hydraulic oil regularly for metal fines and pulverized concrete or rebar dust that signal internal cylinder or rotator wear. Track jaw cycle time and rotation speed against the factory 4.8-second cycle baseline; a slowing cycle points to internal cylinder bypass or a worn rotator motor before a hose or seal fails outright.

Corrective & Common Repairs

Expect the bulk of CR28 repairs at the wear points: the bolted or welded alloy crusher teeth build up or swap when rounded off, and the rotatable rebar cutter edges index to a fresh edge before full replacement. Pivot pins and bushings at the jaw and cylinder mounts wear from concrete grit and need periodic replacement to keep jaw alignment tight. Rod seal leaks on the crushing cylinders are the next most common fix, along with re-torquing loose mounting-bracket bolts after heavy-impact demolition work.

Overhaul & Rebuild Points

Major CR28 rebuilds center on the rotator: the slewing ring and rotator motor carry the torsional load of positioning the tool over concrete structures and eventually need bearing and gear replacement. The crushing cylinders benefit from a full teardown at major overhaul, including rod, seals, and swivel bearings, since the rod-fed hydraulic layout pushes the housing outward rather than the rod, concentrating wear at the housing bore. Inspect jaw-arm welds and mounting ears for fatigue cracking before returning an overhauled unit to service.

Seasonal & Environment Servicing

Demolition and recycling sites load the CR28 with concrete dust, rebar grit, and standing water, all of which pack into the rotator bearing and pivot joints faster than on a clean grading job. Clean and regrease those points more often in dusty or wet conditions, and check the rotator's pressure-relief valve and accumulators, which exist specifically to protect the carrier's stick and boom from shock loading. In cold weather, let the carrier's hydraulic oil warm before full-force crushing cycles to avoid shock loading and a slower jaw response.

CR28 attachments & work tools

Carrier excavator size class and stick compatibility

The CR28 is factory-matched to excavators in roughly the 28,000 kg (62,000 lb) operating-weight class, paired in Caterpillar's own matching guide with the 325B, 330B, 345B, and 350 carriers of that era. Stick length runs about 2.0-3.2 m (6'7"-10'6") on a 325B, up to about 2.15-3.9 m (7'1"-12'10") on a 330B, and a fixed roughly 4.8 m (15'9") stick on 345B/350 pairings. Documentation for this exact tool predates current-generation Cat excavators, so treat carrier pairing as "this weight class" rather than a fixed model list — confirm stick/boom hydraulics fit with your dealer for any modern carrier substitution.

Size position within the CR crusher family

The CR28 sits as the second-smallest of Caterpillar's CR20/CR28/CR35/CR50 concrete-crusher line, scaled between the CR20 (matched to 320B/322B-class carriers) and the larger CR35/CR50 (345B/350/375-class carriers). Tool service weight excluding its mounting bracket runs about 3,100 kg (6,850 lb) with an overall length excluding bracket of about 2,320 mm (91.3 in), a step up from the CR20 and a step below the CR35.

Mounting bracket and rotator system

The crusher hangs from a top-mounted bracket built around a large-diameter slewing ring, giving continuous 360-degree hydraulic rotation rather than a fixed orientation. The rotation circuit is protected by a pressure relief valve plus small hydraulic accumulators that cushion shock loads so excess pressure spikes are not transmitted back into the excavator stick and boom. Original factory documentation shows a bracket group rather than a modern quick-coupler interface — quick-coupler adaptability is not documented for this specific tool and should be verified with a dealer before assuming compatibility.

Jaw and tooth configuration

Each crushing arm carries a matched set of bolted or welded replaceable crushing teeth in high-abrasion alloy steel that can be weld-built-up or swapped when worn, plus a set of rotatable rebar cutters in the jaw throat with multiple usable cutting edges before they need replacement, letting the tool shear rebar and light steel without torch-cutting. Maximum jaw opening is about 915 mm (36 in) with jaw depth of about 750 mm (29.5 in), sized for reinforced concrete sections up to roughly 1.5 m (5 ft) thick or in diameter. This is a fixed crusher-jaw design built for crushing and rebar shearing, not a swap-jaw multi-processor with interchangeable pulverizer/shear/cracker jaw sets.

Hydraulic circuit requirements

The crushing-cylinder circuit needs up to about 350 L/min (93 gpm) oil flow at up to about 34,300 kPa (4,980 psi) working pressure to reach its rated jaw-close cycle time of roughly 5 seconds; twin cylinders feed oil through the rod so the rod stays shielded inside the housing rather than exposed to debris. The separate rotation circuit is a lighter auxiliary line, roughly 20 L/min (5 gpm) at about 17,200 kPa (2,465 psi) working pressure. Both circuits route through the carrier's dedicated attachment/auxiliary hydraulic kit rather than the base digging circuit, so the excavator needs that auxiliary plumbing fitted to run this tool.

Guarding and factory configuration options

Caterpillar recommends falling-object guarding for the carrier cab in demolition work where debris can fall from height; this is offered as a dealer-fitted option rather than standard equipment on the base machine. The crushing cylinders use swivel-bearing mounts to handle the twisting loads of jaw closure, and the rod-fed oil-supply design is itself a factory durability feature rather than a separate ordered option.

All CR28 assemblies by section

Every catalogued assembly group for the Caterpillar CR28. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

160-9069 Housing Gp-Crusher

13***24	Screw-Flat Head	12
14***63	Lockwasher	12
14***79	Bolt; (M20x2.5x100-mm)	30
14***10	Guard	1

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145-4007 Housing Gp-Crusher

14***63	Lockwasher	12
14***86	Screw-Flat Head	12
14***79	Bolt; (M20x2.5x100-mm)	30
14***73	Plate	2

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160-9070 Housing Gp-Crusher

13***24	Screw-Flat Head	20
14***63	Lockwasher	20
14***79	Bolt; (M20x2.5x100-mm)	30
14***10	Guard	1

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160-9067 Housing Gp-Crusher

14***63	Lockwasher	12
14***86	Screw-Flat Head	12
14***64	Gear & Bearing Group	1
14***70	Guard	1

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160-9068 Housing Gp-Crusher

14***63	Lockwasher	12
14***86	Screw-Flat Head	12
14***79	Bolt; (M20x2.5x100-mm)	30
14***04	Gear & Bearing Group	1

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145-4026 Housing Gp-Crusher

13***24	Screw-Flat Head	12
14***63	Lockwasher	12
14***07	Plate	4
14***79	Bolt; (M20x2.5x100-mm)	30

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160-9323 Mounting Gp-Rotator Motor

09***74	Bolt-Socket Head; (M12x1.75x65-mm)	4
14***93	Plate-Mounting	1
15***18	Lockwasher	4
15***19	Lockwasher	4

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145-6438 Mounting Gp-Rotator Motor

14***63	Lockwasher	1
14***93	Bolt; (M12x1.75x40-mm)	1
14***80	Gear-Planetary	1
14***82	Plate-Mounting	1

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160-9324 Mounting Gp-Rotator Motor

09***74	Bolt-Socket Head; (M12x1.75x65-mm)	4
15***19	Lockwasher	8
16***75	Plate-Mounting	1
16***20	Gear-Planetary	1

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Hydraulic System

160-9108 Cylinder & Lines Gp-Crusher

145-3666 Cylinder & Lines Gp-Crusher

145-4020 Cylinder & Lines Gp-Crusher

160-9107 Cylinder & Lines Gp-Crusher

160-9106 Cylinder & Lines Gp-Crusher

160-9109 Cylinder & Lines Gp-Crusher

155-4019 Cylinder Gp-Hydraulic

03***25	Ring-Backup	2
09***33	Seal-O-Ring; (Id=209.30mm)	1
12***17	Bolt-Socket Head; (M24x3x70-mm)	12
14***97	Bearing	2

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145-4039 Cylinder Gp-Hydraulic

09***13	Ring	4
09***77	Setscrew-Socket	1
14***84	Bolt-Socket Head; (M20x2.5x110-mm)	20
14***97	Bearing	2

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160-8245 Cylinder Gp-Hydraulic

03***25	Ring-Backup	2
08***48	Ring	1
09***31	Seal-O-Ring	1
14***45	Bearing	2

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160-8247 Cylinder Gp-Hydraulic

11***65	Ring-Wear	2
14***23	Dowel	1
14***33	Drive-Hex Socket	1
14***11	Plug	1

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158-7793 Cylinder Gp-Hydraulic

03***25	Ring-Backup	2
08***91	Ring-Backup	1
09***28	Seal-O-Ring	1
09***67	Ring	1

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145-3724 Cylinder Gp-Hydraulic

09***77	Setscrew-Socket	1
10***19	Ring-Retaining	4
14***45	Bearing	2
14***84	Bolt-Socket Head; (M20x2.5x110-mm)	20

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160-9096 Lines Gp-Cylinder

14***60	Fitting	4
14***54	Hose As	2
15***82	Swivel Group	1
15***46	Seal	1

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145-4011 Lines Gp-Cylinder

09***85	Bolt-Socket Head; (M14x2x30-mm)	8
12***88	Flange-Split	16
12***22	Bolt; (M14x2x50-mm)	8
12***96	Flange-Half	4

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160-9099 Lines Gp-Cylinder

09***85	Bolt-Socket Head; (M14x2x30-mm)	8
14***60	Fitting	4
14***25	Hose As	2
14***61	Swivel Group	1

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160-9098 Lines Gp-Cylinder

09***85	Bolt-Socket Head; (M14x2x30-mm)	8
14***60	Fitting	4
14***25	Hose As	2
14***61	Swivel Group	1

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145-3733 Lines Gp-Cylinder

12***88	Flange-Split	20
14***60	Fitting	4
14***64	Hose As	1
14***45	Swivel Group	1

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160-9097 Lines Gp-Cylinder

14***60	Fitting	4
14***25	Hose As	2
15***82	Swivel Group	1
15***19	Lockwasher	12

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145-6494 Lines Gp-Motor

14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***25	Plug	3
14***26	Nut	3

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160-6670 Lines Gp-Motor

11***23	Hose As	2
15***94	Adapter As	6
15***44	Seal	1
16***70	Lines Group-Motor	1

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160-6669 Lines Gp-Motor

15***94	Adapter As	6
15***44	Seal	1
16***66	Hose As	2
16***69	Lines Group-Motor	1

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145-6439 Lines Gp-Motor

14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***25	Plug	3
14***26	Nut	3

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160-6668 Lines Gp-Motor

11***30	Hose As	2
15***94	Adapter As	6
15***44	Seal	1
16***68	Lines Group-Motor	1

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160-9715 Motor & Lines Gp-Rotator

16***70	Lines Group-Motor	1
16***22	Motor Group-Gerotor	1
16***24	Mounting Group-Rotator Motor	1
16***15	Motor & Lines Group-Rotator	1

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145-3667 Motor & Lines Gp-Rotator

14***67	Motor & Lines Group-Rotator	1
14***53	Motor Group-Gerotor	1
14***38	Mounting Group-Rotator Motor	1
14***39	Lines Group-Motor	1

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160-9714 Motor & Lines Gp-Rotator

16***69	Lines Group-Motor	1
16***22	Motor Group-Gerotor	1
16***24	Mounting Group-Rotator Motor	1
16***14	Motor & Lines Group-Rotator	1

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145-4021 Motor & Lines Gp-Rotator

14***21	Motor & Lines Group-Rotator	1
14***53	Motor Group-Gerotor	1
14***38	Mounting Group-Rotator Motor	1
14***94	Lines Group-Motor	1

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160-9713 Motor & Lines Gp-Rotator

16***68	Lines Group-Motor	1
16***22	Motor Group-Gerotor	1
16***23	Mounting Group-Rotator Motor	1
16***13	Motor & Lines Group-Rotator	1

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160-9122 Motor Gp-Gerotor

09***66	Bolt; (M8x1.25x75-mm)	4
16***22	Motor Group-Gerotor	1
16***82	Motor Group-Gerotor	1
16***83	Manifold	1

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164-7282 Motor Gp-Gerotor

16***82	Motor Group-Gerotor	1
16***59	Key-Square	1
16***24	Nut-Hex; (1-1/4-18 Thd)	1
16***84	Kit-Housing	1

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145-6153 Motor Gp-Gerotor

14***53	Motor Group-Gerotor	1
14***54	Key	1
14***55	Kit-Seal	1

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145-3730 Mounting Gp-Cylinder

14***42	Plate	4
14***49	Pin As	2
14***19	Pin As	2
14***30	Mounting Group-Cylinder	1

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145-5389 Mounting Gp-Cylinder

14***42	Plate	4
14***38	Pin As	2
14***31	Spacer; (118mm Dia X 9.5mm Thk)	8
14***88	Pin As	2

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145-5731 Mounting Gp-Cylinder

14***31	Plate	4
14***31	Mounting Group-Cylinder	1
14***32	Pin As	2
14***33	Pin As	2

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145-4008 Mounting Gp-Cylinder

14***07	Plate	4
14***08	Mounting Group-Cylinder	1
14***09	Pin As	2
14***48	Pin As	2

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144-1056 Valve Gp-Pressure Control

14***56	Valve Group-Pressure Control	1
14***88	Connector	2
17***54	Valve Group-Relief	2
17***93	Plug	2

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179-1254 Valve Gp-Relief

17***54	Valve Group-Relief	1
6V***06	Seal-Bonded	1
6V***80	Seal-O-Ring; (20.35mm Id)	1

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Service Equipment And Supplies

161-2658 Plate & Film Gp

10***89	Film; (Stripe) (82cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2

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161-2661 Plate & Film Gp

10***89	Film; (Stripe) (82cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2

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161-2659 Plate & Film Gp

10***89	Film; (Stripe) (82cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2

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161-2660 Plate & Film Gp

10***89	Film; (Stripe) (82cm)	0
10***45	Film-Identification; (Cat)	2
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2

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Work Tool Arrangement

145-5510 Crusher Ar-Hydraulic

14***10	Crusher Ar-Hydraulic	1
14***12	Tooth & Cutting Edge Group	1
16***67	Housing Group-Crusher	1
16***06	Cylinder & Lines Group-Crusher	1

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145-4006 Crusher Ar-Hydraulic

14***66	Cylinder & Lines Group-Crusher	1
14***67	Motor & Lines Group-Rotator	1
14***06	Crusher Ar-Hydraulic	1
14***07	Housing Group-Crusher	1

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145-5772 Crusher Ar-Hydraulic

14***72	Crusher Ar-Hydraulic	1
14***74	Tooth & Cutting Edge Group	1
16***70	Housing Group-Crusher	1
16***09	Cylinder & Lines Group-Crusher	1

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145-4077 Crusher Ar-Hydraulic

14***20	Cylinder & Lines Group-Crusher	1
14***21	Motor & Lines Group-Rotator	1
14***23	Tooth & Cutting Edge Group	1
14***26	Housing Group-Crusher	1

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Work Tools

208-5144 Bracket Gp-Mounting

20***43	Bracket As	1
20***44	Bracket Group-Mounting	1
7X***82	Bolt; (M30x3.5x110-mm)	12
8C***22	Nut (M30 X 3.50 Thd)	12

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145-4010 Tooth & Cutting Edge Gp

14***31	Bolt; (M16x2x70-mm)	8
14***37	Shim; (0.3-mm Thk)	2
14***38	Shim; (.5mm Thk)	1
14***39	Shim; (1mm Thk)	1

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145-5774 Tooth & Cutting Edge Gp

14***15	Screw-Flat Head; (M20x2.5x100-mm)	12
14***84	Tooth-Crushing	4
14***78	Lockwasher	12
14***74	Tooth & Cutting Edge Group	1

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145-5512 Tooth & Cutting Edge Gp

14***31	Bolt; (M16x2x70-mm)	8
14***12	Tooth & Cutting Edge Group	1
14***16	Crushing Tooth	4
14***48	Shim; (0.5-mm Thk)	1

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145-4023 Tooth & Cutting Edge Gp

14***35	Tooth-Crushing	4
14***23	Tooth & Cutting Edge Group	1
14***75	Bolt; (M20x2.5x75-Thd)	12
14***78	Lockwasher	12

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CR28 serial number reference

The PIN/serial tag on the CR28 is a small plate riveted (or stamped directly into the steel) on the crusher housing near the mounting ears where the tool pins to the excavator stick, not on the excavator carrier itself. Read it as a 3-letter prefix followed by a sequential unit number (e.g. 4JW00001); the prefix identifies the attachment model/build series and the digits are the build sequence, with no engine or power-rating field since the tool has no engine of its own — it runs off the host excavator's hydraulics.

Prefix	Identifies	Notes
4JW	CR28 hydraulic concrete crusher/pulverizer work tool, PIN 4JW00001 and up — the only production run documented for this attachment	This is the CR28-specific range inside the combined CR20/CR28/CR35/CR50 crusher-concrete-hydraulic parts book. Sibling models in that same book carry their own distinct prefixes (CR20 uses a separate 4-series prefix) — do not treat those as CR28 ranges. No second-generation or B-suffix prefix turned up for the CR28 itself. Production window is roughly 1996 to 2001 for this attachment; treat as approximate and confirm exact start/end serials with your dealer.

Frequently asked questions

What excavators (carriers) fit the Cat CR28?

The CR28 mounts on 325B, 330B, 345B, and 350 Cat excavators. Stick-mount reach runs about 2.0 to 3.2 m (6 ft 7 in to 10 ft 6 in) on the 325B, roughly 2.15 to 3.9 m (7 ft 1 in to 12 ft 10 in) on the 330B, and about 4.8 m (15 ft 9 in) on reach-boom 345B and 350 setups. It has no self-propulsion of its own; it is pin-mounted to the carrier's stick or boom and runs off that machine's hydraulic circuit.

How much does the Cat CR28 weigh?

Service weight is approximately 3,100 kg (6,850 lb), excluding the mounting bracket. Installed weight varies with the mounting bracket and rotator configuration selected for the specific carrier, so treat this as a baseline rather than an exact figure for every setup.

What replaced the CR28, and what powers it?

The CR28 has no engine of its own; it is a purely hydraulic and mechanical attachment powered entirely by the host excavator's hydraulic system. Caterpillar's demolition-attachment lineup later moved from fixed-jaw CR-series crushers to interchangeable-jaw multi-processors, and more recently to dedicated primary and secondary pulverizers, which now cover the pulverizing and rebar-cutting role the CR28 filled.

What CR28 owners discuss

What's the most common hydraulic problem owners report on a Cat CR28-type crusher?

Rod seal and wiper wear on the main crushing cylinder is the first failure point. Grit from broken concrete and rebar works past the wiper over years of use and starts a slow seep at the rod gland. Contaminated oil, a scored or bent rod, and running hot all shorten seal life further. First sign is a thin oil film on the rod during the stroke. Left alone, contamination reaches the barrel wall and turns a simple seal kit job into a bore honing or cylinder replacement job. On a tool this old, sticky or slow cylinder response after sitting can also mean varnished oil rather than a seal problem alone. Reseal at the first sign of leakage with kit seals rated for the tool's working pressure. Have your dealer verify rod and bore condition before the cylinder goes back into service.

How much play should the rotator have, and when is it worn out?

Some play is expected on a tool this age, but clunking on direction reversal, grinding noise, or noticeable radial movement at the mount point to a worn rotator bearing race or worn gear mesh. These rotators need regular greasing through the zerk fittings, ideally rotated through full travel while greasing so the whole raceway gets fresh grease. Gritty or metallic purged grease is an early warning the bearing is breaking down internally. A rotator left to run dry or worn will let the tool head shift unpredictably under crushing load, which is a safety issue, not just a maintenance one. Have your dealer verify bearing clearance and retaining bolt torque before the tool goes back to work.

Jaw teeth look rounded and the crusher struggles to bite into rebar-reinforced concrete. Wear or a bigger issue?

Rounded, chipped, or shortened crushing teeth are the normal wear item on any concrete crusher jaw. They and the bolt-on wear plates behind them are meant to be replaced individually rather than the whole jaw casting. Worn-down teeth lose crushing force and make the jaw close further to get a bite, which slows cycle times and loads the cylinder harder. The rebar-cutting knife section in the throat dulls with use too; some designs let you flip the blade for a second edge before replacement. Keep after wear parts before the base jaw casting takes damage. The casting is not a wear item and is a far more expensive repair than teeth and plates.

What should I check on the main jaw pivot pin and bushings?

The jaw pivot pin and bushings carry the full crushing load every cycle and are a known wear point on any pincer-style attachment this age. Check for elongated, oval-shaped bushing bores, visible step wear on the pin, and side-to-side wobble in the jaw with the tool hanging free of the ground. A dry squeak or grinding at the pivot usually means grease isn't reaching the bushing, or the bushing has already worn through to bare pin. Because this pin sits in the main structural load path and not just a wear point, have your dealer verify pin and bushing clearance against factory tolerance, and replace pins and bushings as a set rather than fitting new bushings to a worn pin.

I mounted the crusher on a different carrier and it feels weak, runs slow, or the hoses get hot. Why?

Crusher and pulverizer tools of this generation were matched at the factory to a specific carrier hydraulic kit: a set auxiliary flow rate and relief valve pressure sized to the tool's cylinders. Run it on a carrier circuit outside that range and you get either a sluggish, underpowered jaw when flow or pressure is too low, or excess heat, seal stress, and early hose failure when pressure is too high. Field-installed auxiliary kits add their own relief valve set for a specific attachment class. Running a crusher off a high-flow circuit meant for a breaker or a different tool is a common cause of blown seals and short hose life. Confirm the carrier's auxiliary flow and pressure settings match the tool's original spec before extended use, and have your dealer verify relief valve settings on any unfamiliar carrier pairing.

What should I check before buying a used CR28?

Work through jaw teeth and wear plates first; heavily rounded or chipped teeth mean a wear-parts order is coming due soon. Cycle the jaw fully with the carrier running and watch the cylinder rod glands for seepage, and check exposed rod surface for scoring or pitting. Rotate the tool through full travel and feel for notchy movement or grinding, and check for radial play at the rotator mount. With the tool off the ground, check the main pivot pin and bushings for play; elongated bushing bores are a common finding on a hard-worked unit. Inspect hydraulic hoses for cracking, chafing, or soft spots; original hose runs on a tool this old are usually well past due for replacement regardless of outward condition. Look over the frame, mounting ears, and welds for cracks, a frequent wear point on any demolition attachment worked hard for years. Ask for the tool's hydraulic flow and pressure spec and confirm it matches whatever carrier you plan to run it on. Because pin, bushing, and structural welds sit in the main load path, have your dealer verify overall structural condition and pin/bushing clearances before putting a used unit into service.

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

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