Caterpillarwork toolcrusher

Caterpillar CR20

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar CR20 is a hydraulic concrete-crusher work tool, not a self-propelled machine. It mounts to the stick of a matched carrier excavator and runs entirely off the carrier's hydraulic system, drawing up to 180 L/min (48 gpm) at roughly 34,300 kPa (4,980 psi) for the crushing cylinder and 20 L/min (5 gpm) at 17,200 kPa (2,465 psi) for the rotator. Service weight is 2,300 kg (5,080 lb) excluding its carrier-specific mounting bracket, and factory literature first documents the tool around 1999, paired with Cat 320B and 322B carrier excavators in the roughly 20 tonne (44,000 lb) class. The CR20 sits at the bottom of Cat's CR-family demolition crusher line, below the CR28, CR35, and CR50, which step up in jaw opening, crushing force, and required carrier size. Standard configuration is a fixed jaw crusher head with replaceable alloy-steel crusher teeth, a rotatable four-edge rebar cutter, and a top-mounted 360-degree continuous hydraulic rotator; no alternate jaw or frame configuration is documented for this model.

Demolition attachment design has moved on since the CR20's era. Current-generation crushers favor quick-change wear cassettes, faster continuous rotation, and tiltrotator-compatible mounting, and no direct current-carrier successor to the CR20 is documented in factory literature; the CR28 is the next size up in the same family, sized for larger carriers. Even so, a well-maintained CR20 still holds value for demolition contractors running older 320B/322B-class carrier excavators. Replaceable crusher teeth, rebar cutter blades, pivot pins and bushings, rotator seals, and cylinder seal kits keep the tool serviceable long after its original carrier has been retired or repowered, and a sound jaw frame and mounting bracket make rebuilding the tool cheaper than sourcing a comparable used unit outright.

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 CR20 specifications

Engine

Power source

No onboard engine. Hydraulically powered work tool, driven entirely by the carrier excavator's hydraulic system (as matched to 320B/322B class carriers).

Weights

Service weight, excluding mounting bracket	2,300 kg (5,080 lb)
Matched carrier operating weight class	Approx. 20 000 kg (44,000 lb) — sized for 320B/322B class excavators

Dimensions

Overall length, excluding mounting bracket	2110 mm (83 in)
Jaw opening, maximum	720 mm (28.3 in)
Jaw depth	630 mm (24.8 in)
Crushing tooth width	350 mm total, 2 x 175 mm (14 in total, 2 x 7 in)
Cutter throat dimension	150 mm (6 in)
Matched carrier stick range — 320B	1.9 - 3.9 m (6'3" - 12'10")
Matched carrier stick range — 322B	2.0 - 3.6 m (6'7" - 11'10")

Performance

Maximum crushing force, tip	719 kN (81 short tons-force)
Maximum crushing force, middle tooth	882 kN (99 short tons-force)
Maximum shearing force, cutting center	2795 kN (314 short tons-force)
Cycle time (full jaw open-to-close stroke)	7.3 sec — varies with carrier configuration and operating conditions
Rotation	Continuous 360°, hydraulically driven, protected by a pressure relief valve and accumulators

Service capacities (summary)

Maximum hydraulic oil flow, crushing cylinder	180 L/min (48 gpm)
Maximum hydraulic oil flow, rotator	20 L/min (5 gpm)
Maximum working pressure, crushing cylinder	34 300 kPa (4,980 psi)
Maximum working pressure, rotator	17 200 kPa (2,465 psi)
Fuel, engine oil, coolant	Not applicable — this is a carrier-mounted attachment with no onboard engine; all fluids are supplied and serviced through the host excavator's own systems.

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

CR20 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable	CR20 is a pin-on/rotator concrete crusher work tool for Cat excavators (320B, 322B carriers); it carries no engine of its own, so no crankcase fill applies.
Cooling system	Not applicable	No engine or radiator on the tool; no coolant system exists to service.
Fuel tank	Not applicable	No fuel system on the tool; the crusher is unpowered and purely hydraulic-mechanical.
Transmission / powertrain compartments	Not applicable	No powertrain on the tool; it has no drivetrain of its own.
Final drives	Not applicable	No final drives fitted; the crusher is a stationary-mounted attachment with no travel function.
Axles / differentials	Not applicable	No axles or differentials fitted.
Hydraulic system (crushing cylinder and 360-degree rotator)	No dedicated onboard reservoir; the crusher draws oil directly from the carrier excavator's hydraulic tank and pump circuit. Rated maximum flow is about 180 L/min (48 US gpm) to the crushing cylinder and about 20 L/min (5 US gpm) to the rotator, at a maximum working pressure near 34 300 kPa (4980 psi) on the cylinder circuit and 17 200 kPa (2465 psi) on rotation.	Follow the carrier excavator's own fluid chart, since the crusher shares that machine's oil. Cat's factory-fill and top-up choice is Cat HYDO Advanced multigrade hydraulic oil; acceptable commercial alternates are oils meeting Cat ECF-1-a, ECF-2, or ECF-3 performance, or Cat TO-4/TO-4M where the carrier calls for it, with a minimum zinc additive level of about 0.09 percent (900 ppm). Viscosity grade is picked from the carrier excavator's own ambient-temperature chart, not from a CR20-specific chart, since the tool has no independent reservoir.
Grease - crusher pins, bushings, and rotator/swivel bearing	Spec only, no fill volume given. Grease each fitting with a hand or power grease gun until fresh grease purges visibly at the joint; repeat at the machine's standard daily/shift greasing interval or per the carrier excavator's work-tool greasing schedule.	Cat Multipurpose Grease (Cat MPGM), an NLGI 2 extreme-pressure grease with a molybdenum disulfide (moly) additive, for the high-load crushing-arm pins, bushings, and the rotator/slewing-ring bearing. In sub-zero or arctic ambient conditions, step down to a softer NLGI grade multipurpose EP grease per dealer recommendation to keep the grease pumpable and to maintain film strength at the pin joints.

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

Caterpillar CR20 maintenance schedule

Service interval	Tasks
Every 50 h	Inspect crusher teeth and rebar cutter edges for cracks, chips, or excess wear Check jaw pivot pins and bushings for grease bleed-out; regrease if dry Inspect hydraulic hoses, fittings, and quick-couplers for leaks, abrasion, or kinks Check mounting bracket bolts for looseness; retorque as needed Verify rotator turns smoothly through full 360 degrees with no binding or excess play Clean crusher jaw and rotator housing of concrete debris and rebar fragments
Every 250 h	Grease rotator bearing and drive gear per lube chart Inspect cylinder rods for scoring, pitting, or seal weep Check jaw alignment and closing pattern for uneven wear Rotate or index crusher teeth if wearing unevenly Inspect structural welds at jaw frame and bracket for cracking Torque-check all bracket and pivot pin retention hardware
Every 500 h	Measure pin and bushing wear at jaw pivot and cylinder clevis against service limits Sample the carrier excavator's hydraulic oil for contamination and wear metals, since the crusher has no reservoir of its own Inspect rotator seals for leakage; replace if seeping Check crusher tooth retention hardware; replace worn or cracked teeth Inspect rebar cutter blades for edge rounding; rotate to the next cutting edge
Every 1,000 h	Remove and inspect all jaw pivot pins and bushings; replace any beyond wear limit Pull and inspect cylinder seals; reseal cylinders showing rod leakage or drift Check rotator bearing preload and backlash; adjust or replace per spec Perform a crack check on jaw frame and mounting bracket welds Replace hydraulic hoses showing surface cracking, abrasion, or age-hardening Confirm carrier-side relief valve settings match the crusher's rated flow and pressure
Every 2,000 h	Fully disassemble the jaw assembly; replace all pins, bushings, and seals as a set Overhaul the rotator assembly: replace bearing, seals, and drive components Reseal all hydraulic cylinders; inspect rods for straightness and replace if bent Inspect and repair or reinforce any cracked structural castings or weldments Replace crusher teeth and rebar cutter blades nearing end of service life Repaint and re-protect exposed steel surfaces against corrosion
Every 4,000 h	Send the jaw frame and bracket for structural inspection (magnetic particle or ultrasonic) Rebuild or replace the rotator assembly complete with new bearing race and drive gear Replace all hydraulic hoses and fittings as a set regardless of visual condition Re-machine or bush worn pin bores in the jaw frame and bracket Evaluate the tool for economical rebuild versus replacement against current jaw and frame wear limits

Servicing the CR20 beyond the schedule

Predictive Maintenance & Fluid Analysis

The CR20 has no engine or reservoir of its own, so predictive care centers on the carrier excavator's hydraulic oil and the crusher's wear metal. Sample the carrier's hydraulic oil regularly for contamination and wear metals, since jaw-side loads and rebar shearing put unusual stress on the shared circuit. Track jaw and rebar cutter tooth wear against factory limits at each interval, and log pin-and-bushing play at the jaw pivot and cylinder clevis to catch bore wear before it reaches the frame.

Corrective & Common Repairs

Most CR20 repairs are wear-part swaps, not breakdowns: replacing worn or chipped crusher teeth, rotating or replacing the four-edge rebar cutter blades, and swapping cracked or abraded hydraulic hoses feeding the crushing cylinder and rotator. Cylinder rod seal leakage and rotator seal weep are the next most common jobs, usually traced to concrete dust working past worn wipers. Because the tool shares the carrier's hydraulic power, always isolate and relieve pressure at the carrier before disconnecting any crusher line.

Overhaul & Rebuild Points

A full CR20 rebuild centers on three areas: the jaw pivot pin-and-bushing set, the crushing and opening cylinders, and the rotator assembly. Pins and bushings wear fastest under heavy rebar-shearing duty and should be measured against service limits before reuse. Cylinders typically need a full reseal and rod inspection by this stage, and the rotator bearing, seals, and drive gear are usually replaced together rather than piecemeal. Inspect the jaw frame and mounting bracket welds for cracking before returning the tool to service.

Seasonal & Environment Servicing

Switch to a cold-weather-rated grease at the jaw pivots and rotator in freezing climates; stiff summer-grade grease bleeds out and starves pins at low temperatures. Before winter layup, coat exposed pins, cylinder rods, and bare steel with a corrosion inhibitor, since the CR20 carries no paint on its wear faces. Inspect hydraulic hoses for age-hardening or cracking before the first cold start of the season, since cold oil raises line pressure spikes. Store the tool with the jaw closed to protect cylinder rods from weather exposure.

CR20 attachments & work tools

Crusher jaw / teeth set

Each crushing arm carries two bolted/welded replaceable crusher teeth in high-abrasion-resistant alloy steel that can be built up or replaced, plus two replaceable rebar cutters with rotatable four-edge inserts in the throat. Teeth measure 2 x 175 mm (2 x 7 in), jaw depth is 630 mm (24.8 in), and maximum jaw opening is 720 mm (28.3 in).

Rebar / reinforcement cutting capability

The throat-mounted cutter knives are sized to shear rebar and light steel profiles inside reinforced concrete, removing the need for torch-cutting during demolition. This is a fixed functional feature of the crusher head, not a separate selectable option.

Carrier / stick-mount compatibility

Factory literature pairs the CR20 with the Cat 320B and 322B excavators (roughly 20 tonne / 44,000 lb base machine operating weight class), on stick ranges of 1.9-3.9 m (6'3"-12'10") for the 320B and 2.0-3.6 m (6'7"-11'10") for the 322B. Larger crushers in the same family (CR28, CR35, CR50) step up to larger carriers; those pairings do not apply to the CR20 head.

Mounting bracket / coupler system

The CR20 is a dedicated stick-mounted tool with a large-diameter, top-mounted 360 degree hydraulic rotator rather than a universal quick-coupler pickup. Service weight of 2300 kg (5,080 lb) is quoted excluding the mounting bracket, since the bracket is matched to the specific carrier stick.

Hydraulic circuit / kit requirements

Crushing cylinders need up to 180 L/min (48 gpm) at a maximum working pressure of about 34,300 kPa (4,980 psi), giving a rated cycle time near 7.3 seconds. Rotation runs on a separate, lower-flow circuit rated at 20 L/min (5 gpm) and about 17,200 kPa (2,465 psi); the carrier needs a demolition-grade auxiliary hydraulic supply matched to these two circuits, not standard bucket-only plumbing.

Rotator protection

The hydraulic rotator is fitted with a pressure relief valve and two small accumulators to keep excessive hydraulic pressure spikes from transmitting shock loads back into the excavator stick and boom.

Guarding options

Caterpillar recommends falling-object guards (FOG) for the excavator cab on demolition jobs where overhead debris is a risk; these are dealer-fitted options rather than a standard part of the crusher package.

Family sizing context

The CR20 is the smallest member of the CR20/CR28/CR35/CR50 concrete-crusher line. Across the family, service weight scales up substantially at the largest model, and max jaw opening scales from 720 mm (28.3 in) upward; do not apply larger-model figures to the CR20 itself.

All CR20 assemblies by section

Every catalogued assembly group for the Caterpillar CR20. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

Hydraulic System

145-4020 Cylinder & Lines Gp-Crusher

14***08	Mounting Group-Cylinder	1
14***11	Lines Group-Cylinder	1
14***20	Cylinder & Lines Group-Crusher	1
14***39	Cylinder Group-Hydraulic	2

See all parts with full part numbers in Heavy Parts AI →

145-3666 Cylinder & Lines Gp-Crusher

14***66	Cylinder & Lines Group-Crusher	1
14***24	Cylinder Group-Hydraulic	2
14***30	Mounting Group-Cylinder	1
14***33	Lines Group-Cylinder	1

See all parts with full part numbers in Heavy Parts AI →

160-9109 Cylinder & Lines Gp-Crusher

14***31	Mounting Group-Cylinder	1
16***47	Cylinder Group-Hydraulic	2
16***99	Lines Group-Cylinder	1
16***09	Cylinder & Lines Group-Crusher	1

See all parts with full part numbers in Heavy Parts AI →

160-9106 Cylinder & Lines Gp-Crusher

14***89	Mounting Group-Cylinder	1
15***93	Cylinder Group-Hydraulic	2
16***96	Lines Group-Cylinder	1
16***06	Cylinder & Lines Group-Crusher	1

See all parts with full part numbers in Heavy Parts AI →

160-9107 Cylinder & Lines Gp-Crusher

14***30	Mounting Group-Cylinder	1
16***45	Cylinder Group-Hydraulic	2
16***97	Lines Group-Cylinder	1
16***07	Cylinder & Lines Group-Crusher	1

See all parts with full part numbers in Heavy Parts AI →

160-9108 Cylinder & Lines Gp-Crusher

14***08	Mounting Group-Cylinder	1
15***19	Cylinder Group-Hydraulic	2
16***98	Lines Group-Cylinder	1
16***08	Cylinder & Lines Group-Crusher	1

See all parts with full part numbers in Heavy Parts AI →

160-8247 Cylinder Gp-Hydraulic

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

160-8245 Cylinder Gp-Hydraulic

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

160-9097 Lines Gp-Cylinder

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

145-3733 Lines Gp-Cylinder

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

See all parts with full part numbers in Heavy Parts AI →

160-9096 Lines Gp-Cylinder

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

See all parts with full part numbers in Heavy Parts AI →

145-6439 Lines Gp-Motor

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

See all parts with full part numbers in Heavy Parts AI →

145-6494 Lines Gp-Motor

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

145-6153 Motor Gp-Gerotor

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

Service Equipment And Supplies

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

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

See all parts with full part numbers in Heavy Parts AI →

CR20 serial number reference

The CR20 PIN/serial plate is riveted to the crusher housing, not on a carrier machine frame, since this is an excavator work tool rather than a self-contained machine. Read the first three characters as the serial prefix identifying the model and parts-manual grouping (4DW = CR20), and the following five digits as the sequence/build number for that model run. Exact plate placement on the housing can vary by unit; if not visible at a glance, check dealer literature.

Prefix	Identifies	Notes
4DW	CR20 hydraulic concrete crusher, sole confirmed serial prefix	Covers the CR20 CRUSHER-CONCRETE-HYDRAULIC work tool from 4DW00001 up. No engine of its own; it is a stick-mounted hydraulic attachment powered by the carrier excavator's hydraulic system. Fits Cat 320B (stick range 1.9-3.9 m / 6'3"-12'10") and 322B (2.0-3.6 m / 6'7"-11'10") carriers. Approximate service weight 2300 kg (5,080 lb) excluding mounting bracket; length excluding mounting bracket 2110 mm (83 in); maximum jaw opening 720 mm (28.3 in). No second-generation or variant prefix found in sources checked; if a unit shows a different prefix, confirm the model designation with a dealer before assuming it is a CR20.

Frequently asked questions

What carrier excavators fit the Caterpillar CR20?

Factory literature pairs the CR20 with Cat 320B and 322B carrier excavators, roughly 20 tonnes (44,000 lb) operating class, using a carrier-matched stick bracket. No confirmed pairing with later C-series, D-series, or Next Generation carriers is documented; check with your dealer before adapting the tool to a different carrier.

How much does the Caterpillar CR20 weigh?

Service weight is 2,300 kg (5,080 lb), excluding the carrier-specific mounting bracket. Bracket weight varies by which carrier excavator it is built for, so total installed weight runs higher depending on configuration.

What replaced the Caterpillar CR20?

No direct successor model is documented in factory literature. Within the same CR-family, the CR28 is the next size up and remains the closest factory-documented step-up option. Buyers looking for a modern equivalent should confirm current-generation compatibility directly with a Cat dealer.

What CR20 owners discuss

What do owners say about jaw and tooth wear on the CR20?

Concrete crushing is abrasive on the jaw teeth and wear plates well before anything else on the tool shows wear. Operators keep hardsurfacing built up on the high-wear leading edges of the jaw; letting that buildup wear through exposes the parent steel and can lead to cracking, not just faster wear. Bolt-on tooth and wear-plate segments are meant to be swapped or rotated at roughly half wear rather than run to failure, and most shops keep a spare set on hand so the tool doesn't sit down for a welding session. Uneven wear across the jaw, or wear concentrated at one pivot point, points to a bent jaw or a worn pin/bushing rather than normal use and is worth a straightness check.

Rotator bearing and seal life on the CR20 - what's the pattern?

The 360-degree hydraulic rotator sits between the CR20 and the excavator stick bracket and is the one component turning continuously under load, so it's the first place people look when the tool feels stiff to rotate or seeps oil at the swivel. Cat built a pressure relief valve and small accumulators ahead of the rotator specifically to keep crushing-force spikes from transmitting back into the excavator's boom and stick. If that relief circuit is out of adjustment, rotator seals take the abuse and fail early, and the shock loads reach the carrier's linkage instead of being absorbed. Slow or jerky rotation, or oil weeping from the swivel housing, is treated as a seal/relief-valve symptom, not something to chase with more grease. Have your dealer verify the relief valve setting and accumulator pre-charge before condemning the rotator itself.

Is crushing-arm pin and bushing wear a maintenance headache on this tool?

Yes, more so than on a standard digging bucket. The shock-loading nature of crushing, versus the steady pull of a bucket, works pins and bushings harder, and operators note crusher-style attachments are noticeably tougher on pin joints than plain buckets. Greasing intervals get tightened up in the field rather than left at the book schedule. Once a bore starts to egg out, the fix is line-boring or machining the housing and pressing in a new bushing - there's no shortcut once play develops, and running it loose accelerates wear into the pin bosses themselves.

What hydraulic hose and cylinder seal problems come up most?

Hose routing near the pivot area takes abrasion and flex fatigue, and leaks tend to show up at crimped fittings and quick-connects rather than mid-hose. A jaw that creeps shut or won't hold position under load is a common complaint on this class of attachment. The consensus troubleshooting order is to check the pilot-operated holding/check valve first, since dirt under the seat or a worn seat lets oil weep past and is usually the cheap fix, then the directional valve spool, and only suspect the cylinder's internal piston seals last because that teardown is the most expensive. A jaw that won't hold its bite is treated as a safety issue, not just a productivity one. Have your dealer verify the holding valve and cylinder before returning the tool to service.

How often do the rebar-cutter edges need attention?

The cutters mounted in the throat of the jaw are built with multiple usable cutting edges. Field practice is to index or rotate the cutter to bring a fresh edge into play instead of replacing the whole piece each time it dulls, then swap the cutter once every edge is used up. Cutting a lot of heavy rebar dulls edges faster than plain unreinforced concrete, so crews doing rebar-heavy demolition rotate cutters more often than crews doing crushing-only work.

Which carrier and mounting setup actually works, and what are the compatibility gotchas?

The CR20 is a work tool only - no engine, no undercarriage, and no onboard electronics of its own. It mounts to a stick bracket and draws all its power and control from the carrier excavator's auxiliary hydraulic circuit through the tool's rotator. Cat's own pairing puts the CR20 on carriers in roughly the 18-24 tonne class (around 39,600-52,950 lb, varies by configuration) with a matching stick length. Running it on a carrier outside that hydraulic flow and pressure window is the main compatibility complaint people raise: an undersized excavator can't develop full crushing force, and an oversized one can overpower the relief circuit. Match flow and pressure to the tool's rated range, not just pin size. Have your dealer verify the carrier's auxiliary circuit is within spec before running it hard.

What should I check before buying a used CR20?

Buyers walk the same checklist as any demolition attachment. Look for scalloped, uneven wear across the jaw teeth, a sign of a bent jaw or worn pivot rather than plain use, and check pin/bushing play at every pivot with the tool hanging and unloaded. Cycle the jaw fully open and closed watching for creep or hesitation that points to a weak holding valve or worn cylinder seals. Check the rotator for smooth full-rotation travel with no stiff spots or oil weeping at the swivel, and inspect the mounting bracket and adapter plate welds closely for cracks, the highest-consequence failure point on the whole tool. Ask for service records showing hardsurfacing/buildup welding was kept current on the jaw and cutter throat; a tool let go past that point usually needs the parent steel repaired, not just new wear parts. Have your dealer verify structural welds, the rotator relief-valve setting, and cylinder holding performance before you commit - these are the safety-critical items a walk-around won't fully catch.

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

Need a specific CR20 part?

Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.

Search parts in the app