Caterpillarwork toolshear-demolition/scrap

Caterpillar S25

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar S25 is a passive mobile scrap and demolition shear, a hydraulically actuated jaw attachment that mounts to the stick of a compatible excavator carrier in the 18 to 26 t class. It has no engine, ECM, or undercarriage of its own; its jaw cylinder runs entirely on hydraulic flow and pressure supplied by the host machine. Operating weight is approximately 2.4 t (5,291 lb), with a jaw opening near 550 mm (21.7 in), jaw depth near 545 mm (21.5 in), overall length near 2,930 mm (115.4 in), and rated cutting force near 1,646 kN. It carries serial prefix 2RW and was built roughly 1996 to 2001 as the smallest member of Caterpillar's original S-series demolition and scrap shear lineup, alongside the S30/S230, S40/S240, S50/S250, S80/S280, and S130/S2130. No documented predecessor exists in Caterpillar's catalog for this size class; the S25 held the entry position in that first-generation shear line. Configurations included straight (fixed) and rotating mounts to suit different carrier stick or boom setups.

Across the S-series line, Caterpillar carried the same basic jaw-and-pivot architecture upward in size while refining details: field-serviceable pivot pins adjustable without special tools, replaceable blade tips, and dual high-pressure hydraulic ports that let a shear attach to carriers with different circuit layouts without custom plumbing. Later rotating variants added continuous rotation so operators could index the jaw without repositioning the carrier. Caterpillar has since moved to a differently numbered S2000/S3000-series shear range; no source ties the S25 directly to a specific successor model, so any lineage claim beyond that broader product category is unconfirmed. In the used and parts market the S25 still matters because its low weight and moderate cutting force fit smaller demolition and scrap-processing jobs where a full-size shear would overload the carrier, and because its simple passive design, with no engine or electronics, keeps rebuild costs limited to pins, bushings, blades, and cylinder seals rather than powertrain components.

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 S25 specifications

Engine

Power source	Passive hydraulic shear jaw with no onboard engine or ECM. It runs off the carrier excavator's own hydraulic system; there is no independent power unit to spec.
Carrier requirement	Built for hydraulic excavator carriers in the 18-26 t (19.8-28.7 ton) class. No engine displacement, cylinder count, or emissions tier applies to the tool itself.

Weights

Operating weight	2.4 t (5,291 lb), shear head as mounted.
Shipping weight	Not separately published; treat operating weight as the shipping figure for quoting freight.
Ground pressure	Not applicable — this is an excavator-mounted attachment, not a ground-bearing machine.

Dimensions

Overall length	2,930 mm (115.4 in).
Jaw opening	550 mm (21.7 in).
Jaw opening depth (throat)	545 mm (21.5 in).
Width/height	Not documented in available factory literature for this model; confirm with a dealer if mounting clearance is critical.

Performance

Cutting force	1,646 kN (about 370,000 lbf).
Compatible carrier weight class	18-26 t (19.8-28.7 ton) excavators.
Cycle time	Not documented for this model.
Travel speed / drawbar / gradeability	Not applicable — passive attachment with no travel function of its own.

Service capacities (summary)

Hydraulic system	No dedicated reservoir; the shear draws oil flow and pressure from the carrier excavator's auxiliary hydraulic circuit. Oil flow and pressure figures specific to the S25 are not documented in available literature — match to the carrier's auxiliary circuit spec or check with a dealer.
Fuel tank / engine oil / cooling system	Not applicable — the shear has no engine, fuel system, or cooling system of its own.

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

S25 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable — the S25 has no engine of its own.	N/A. The S25 is a passive hydraulic scrap/demolition shear attachment (part of the S25/S225, S30/S230, S40/S240, S50/S250, S80/S280, S130/S2130 shear family) mounted on an excavator carrier. It has no onboard powerplant.
Cooling system	Not applicable.	N/A. No radiator or coolant circuit on the attachment itself; any cooling need is handled by the host carrier machine.
Fuel tank	Not applicable.	N/A. No fuel system on the shear; it is purely hydraulically actuated by the carrier.
Transmission / powertrain compartment	Not applicable.	N/A. No transmission, drivetrain, or powershift compartment on this attachment.
Final drives (each)	Not applicable.	N/A. No final drives; the shear has no travel/drive function.
Hydraulic system and tank	No dedicated reservoir on the attachment. The shear runs off the host carrier excavator's hydraulic circuit through quick-couplers/hoses; capacity is governed by the carrier machine's own hydraulic tank, not by the shear.	Use the hydraulic oil already specified for the host carrier (Cat HYDO Advanced, Cat TDTO, or Cat BIO HYDO as fitted). Keep supply oil clean to the cleanliness level called out in the carrier's own operation and maintenance manual; the shear itself carries no separate oil charge or viscosity grade.
Axles / differentials	Not applicable.	N/A. No axles or differentials on this work tool.
Grease (pivot pins, blade bushings, and rotation mechanism where fitted)	Spec only — no fill volume; apply at each grease fitting per the lubrication schedule until purged.	Cat multipurpose or moly-fortified pin grease of the type Caterpillar specifies for shear/attachment pivot points (e.g., Cat Advanced 3Moly Grease for moderate load/speed pin-and-bushing service, ambient range roughly -20 to 40 C / -4 to 104 F). The exact grease callout in the S25-specific OMM text could not be independently confirmed from available sources — verify the precise product name and interval against the dealer copy of the S25 operation and maintenance manual before ordering.

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

Caterpillar S25 maintenance schedule

Service interval	Tasks
Every 10 h	Grease both jaw pivot pins and any cylinder pins before each shift, wiping fittings clean first so grit is not forced into the joint Inspect blade edges and jaw tips for chipping, cracking, or rolled edges before continuing work Check hydraulic hoses, quick-couplers, and fittings on the shear circuit for leaks, chafing, or loose connections Confirm the mounting pins or coupler wedge/bracket are fully engaged and locked before lifting or cutting Clear packed scrap, rebar, and debris from the jaw throat and pivot area Verify the jaw opens, closes, and rotates (rotating variants) smoothly with no binding
Every 250 h	Check jaw and blade wear plates for step wear and rotate or index blades if wear favors one edge Torque-check mounting bracket bolts and coupler retention fasteners to shop-manual spec Inspect pivot pin retaining hardware, snap rings, keeper bolts, or plates for wear or looseness Measure pivot pin-to-bushing clearance and flag any side play beyond published limits Inspect cylinder rod, pin bosses, and hose routing for chafe points caused by the swing arc
Every 500 h	Remove and inspect jaw pivot bushings for scoring or wear, replacing any pair that exceeds shop-manual clearance Check blade retaining bolts (bolt-on tip designs) for stretch and confirm torque Inspect the rotator or swivel (rotating models) for seal weep or drift Check structural welds at the yoke, cylinder lugs, and jaw ears for cracking Sample hydraulic oil from the host carrier's circuit if debris ingestion into the shear cylinder is suspected
Every 1,000 h	Pull pivot pins for full inspection, measure pin diameter and bushing bore, and replace worn bushings as matched sets Reseal the shear cylinder if rod scoring or seal weep is found Check jaw alignment and closure geometry and shim as needed to restore blade overlap Inspect the rotator gear or bearing (rotating models) for backlash Refinish exposed structural surfaces to control corrosion from scrap-yard exposure
Every 2,000 h	Tear down all pivot joints and replace pins and bushings as matched sets regardless of measured wear Inspect the yoke, jaw, and frame weldments for cracking at high-stress radii using dye-penetrant or visual crack checks Rebuild or replace the shear cylinder seal kit and inspect the rod for wear Inspect and rebuild the rotator drive and seal package (rotating models) Verify hydraulic relief and flow settings on the host carrier match the shear-specific circuit requirements
Every 4,000 h	Complete a full structural overhaul: replace jaw wear components, re-bush or line-bore pivot bores, and replace all pins as a set Send major castings and weldments for magnetic-particle or dye-penetrant inspection before returning the shear to service Replace all hydraulic hoses on the shear regardless of visible condition Evaluate whether continued rebuild is cost-effective versus replacement, given the attachment's age and parts availability

Servicing the S25 beyond the schedule

Predictive Maintenance & Fluid Analysis

The S25 has no engine or hydraulic reservoir of its own; its jaw cylinder runs on the host carrier's circuit, so predictive care means monitoring that carrier's hydraulic oil. Pull fluid samples at the carrier's scheduled interval and watch for elevated particle counts, since demolition debris and rebar dust migrate past cylinder seals faster than in digging work. Track cylinder cycle times and rotator drift as early wear indicators. Log pivot-pin clearance trends over successive inspections to predict bushing replacement before play becomes structural.

Corrective & Common Repairs

Most S25 repairs center on the jaw, not a powertrain. Chipped or rolled blade edges and worn wear plates are the most common finds; index or replace blades before the jaw loses closure alignment. Worn pivot pins and bushings cause side play and uneven cutting force, replace both together rather than pins alone. Weeping cylinder seals or a drifting rotator (on rotating variants) point to a reseal job. Cracked yoke or jaw-ear welds need repair before returning the shear to service.

Overhaul & Rebuild Points

Overhaul on the S25 is a structural job: pivot bores and bushings, not internal engine components. At major teardown, measure every pivot bore against shop-manual limits and re-bush or line-bore oversized bores rather than fitting an undersized pin. Inspect the yoke, jaw ears, and cylinder lugs for fatigue cracking at high-stress radii using dye-penetrant or magnetic-particle checks, since this attachment sees full shock loading from scrap and rebar. Rebuild the shear cylinder seal kit and rotator (rotating models) as a set, and replace all pins together to keep clearances matched.

Seasonal & Environment Servicing

Because the S25 draws its hydraulic power from the host carrier, cold-weather performance depends on that carrier's oil viscosity grade; confirm the carrier is running a season-appropriate hydraulic fluid before heavy shearing in freezing conditions, since cold, thick oil slows jaw response and stresses hoses. In hot or dusty demolition and scrap-yard settings, clear packed debris and fines from the pivot joints and jaw throat daily to keep grease at the pins effective and prevent abrasive grit from accelerating bushing wear.

S25 attachments & work tools

Carrier excavator compatibility / weight class

Listed operating weight is about 2.4 t (5,290 lb) with a carrier range noted in roughly the 18-26 t excavator class. This is an older shear predating Cat's current S2000/S3000 series lineup, so its carrier fit should not be cross-referenced against today's S30xx/S20xx charts. Confirm exact carrier match with a dealer, since surviving documentation on this exact unit is limited.

Jaw opening and cutting capacity

Jaw/wrench opening is about 550 mm (21.7 in), jaw depth near 545 mm (21.5 in), overall length about 2,930 mm (115 in), with a rated cutting force in the area of 1,646 kN at the throat. Intended duty is size-reduction of structural steel, beams, rebar, pipe and plate on scrap and demolition sites, the same role later Cat scrap/demolition shears fill.

Mounting and coupler system

The base unit ships without hoselines and without a carrier-specific mounting adapter; both are sourced separately and matched to the excavator. Cat's shear line generally offers either a pin-on bracket for direct boom- or stick-mount, or a mechanical quick-hitch/quick-coupler mount (pin-grabber or dedicated coupler) for faster tool changes. Treat this as the standard family pattern rather than a confirmed S25-specific option list.

Hydraulic arrangement

The shear runs off the carrier's dedicated attachment (auxiliary) hydraulic circuit. Because hoses are not included from the factory, a hose kit sized to the specific excavator's plumbing is required at fit-up. Later shears in this general family run a separate, lower-pressure circuit for 360-degree rotation when a rotator is fitted; this is not confirmed for the exact S25/S225 unit in available sources.

Sibling / family naming

S25 sits at the small end of an older Cat demolition-shear range built roughly 1996-2001 that also included S225, S30/S230, S40/S240, S50/S250, S80/S280 and S130/S2130. The paired numbers (bare vs. a '2'-prefixed variant) suggest a mount-type or configuration split within each size, echoing how Cat's later shears split into straight/boom-only versus rotating stick-or-boom versions. The exact difference between S25 and S225 is not spelled out in available sources -- verify with a dealer before ordering.

Rotation and guarding

As a category, Cat mobile shears are offered in fixed/straight (boom-mount only, fewer service points) and 360-degree rotating (stick- or boom-mount) configurations, with a protective housing shielding the cutting cylinder and wear plates guarding the fixed jaw face during scrap-pile work. Whether S25 itself was offered with a rotator isn't confirmed in available documentation -- check the data plate or dealer records for the specific unit.

All S25 assemblies by section

Every catalogued assembly group for the Caterpillar S25. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

144-3066 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
12***54	Screw-Flat Head; (M12x1.75x35-mm)	16
14***73	Lockwasher	16
14***59	Retainer	2

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144-0998 Housing Gp-Shear

14***98	Housing Group-Shear	1
14***67	Swivel As	1
14***03	Housing As	1
14***93	Bumper	8

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144-0988 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
10***55	Plate-Warning	1
12***54	Screw-Flat Head; (M12x1.75x35-mm)	16
14***88	Housing Group-Shear	1

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144-3082 Housing Gp-Shear

14***73	Lockwasher	24
14***14	Lockwasher	4
14***82	Housing Group-Shear	1
14***93	Bumper	8

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144-0965 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
10***55	Plate-Warning	1
13***24	Screw-Flat Head	26
14***65	Housing Group-Shear	1

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144-0978 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
10***55	Plate-Warning	1
12***54	Screw-Flat Head; (M12x1.75x35-mm)	16
14***78	Housing Group-Shear	1

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178-6221 Housing Gp-Shear

14***67	Swivel As	1
14***93	Bumper	8
14***06	Bolt-Socket Head; (M20x2.5x140-mm)	4
14***67	Screw-Flat Head, Ring; Rectangular Ring, Ring, Ring; Replaces 421697a1	26

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144-3072 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
12***54	Screw-Flat Head; (M12x1.75x35-mm)	16
14***63	Lockwasher	16
14***05	Housing As	1

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156-4984 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
12***54	Screw-Flat Head; (M12x1.75x35-mm)	16
14***59	Retainer	2
14***63	Lockwasher	16

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144-3063 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
14***59	Retainer	2
14***63	Lockwasher	26
14***86	Screw-Flat Head	26

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160-7473 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
12***54	Screw-Flat Head; (M12x1.75x35-mm)	16
14***63	Lockwasher	16
14***05	Housing As	1

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144-0959 Housing Gp-Shear

14***59	Housing Group-Shear	1
14***48	Pin	1
14***52	Bushing	2
14***59	Retainer	2

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144-0973 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
14***73	Housing Group-Shear	1
14***59	Retainer	2
14***63	Lockwasher	26

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152-3850 Housing Gp-Shear

09***05	Bolt-Socket Head; (M16x2x100-mm)	3
14***59	Retainer	2
14***63	Lockwasher	22
14***65	Swivel As	1

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144-6042 Mounting Gp-Rotator Cylinder

14***42	Mounting Group-Rotator Cylinder	1
14***43	Coupling	2
14***44	Pin	2
14***73	Lockwasher	6

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144-6146 Mounting Gp-Rotator Cylinder

14***97	Bolt-Socket Head; (M20x2.5x120-mm)	20
14***46	Mounting Group-Rotator Cylinder	1
14***48	Pin	1
14***73	Lockwasher	4

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144-3146 Mounting Gp-Rotator Cylinder

14***88	Bolt-Socket Head	8
14***89	Bolt-Socket Head	8
14***46	Mounting Group-Rotator Cylinder	1
14***47	Coupling	1

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144-4214 Mounting Gp-Rotator Cylinder

14***84	Bolt-Socket Head; (M20x2.5x110-mm)	14
14***14	Mounting Group-Rotator Cylinder	1
14***15	Coupling	1
14***16	Pin	1

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144-3765 Mounting Gp-Rotator Cylinder

14***97	Bolt-Socket Head; (M20x2.5x120-mm)	8
14***65	Mounting Group-Rotator Cylinder	1
14***66	Coupling	1
14***67	Pin	1

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144-2762 Mounting Gp-Rotator Cylinder

09***06	Bolt-Socket Head; (M16x2x80-mm)	8
14***91	Coupling	1
14***92	Pin	1
14***62	Mounting Group-Rotator Cylinder	1

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Hydraulic System

144-0990 Cylinder & Lines Gp-Rotator

14***90	Cylinder & Lines Group-Rotator	1
14***44	Cylinder Group-Rotator	1
14***46	Mounting Group-Rotator Cylinder	1
14***50	Lines Group-Rotator Cylinder	1

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144-0968 Cylinder & Lines Gp-Rotator

14***68	Cylinder & Lines Group-Rotator	1
14***44	Cylinder Group-Rotator	1
14***46	Mounting Group-Rotator Cylinder	1
14***51	Lines Group-Rotator Cylinder	1

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144-0975 Cylinder & Lines Gp-Rotator

14***75	Cylinder & Lines Group-Rotator	1
14***63	Cylinder Group-Rotator	1
14***65	Mounting Group-Rotator Cylinder	1
14***73	Lines Group-Rotator Cylinder	1

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144-0961 Cylinder & Lines Gp-Rotator

14***61	Cylinder & Lines Group-Rotator	1
14***34	Lines Group-Rotator Cylinder	1
14***88	Cylinder Group-Rotator	1
14***62	Mounting Group-Rotator Cylinder	1

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144-1000 Cylinder & Lines Gp-Rotator

14***00	Cylinder & Lines Group-Rotator	1
14***12	Cylinder Group-Rotator	2
14***42	Mounting Group-Rotator Cylinder	1
14***45	Lines Group-Rotator Cylinder	1

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145-6218 Cylinder & Lines Gp-Rotator

14***65	Mounting Group-Rotator Cylinder	1
14***00	Cylinder Group-Rotator	1
14***17	Lines Group-Rotator Cylinder	1
14***18	Cylinder & Lines Group-Rotator	1

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144-0980 Cylinder & Lines Gp-Rotator

14***80	Cylinder & Lines Group-Rotator	1
14***12	Cylinder Group-Rotator	1
14***14	Mounting Group-Rotator Cylinder	1
14***51	Lines Group-Rotator Cylinder	1

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144-0999 Cylinder & Lines Gp-Shear

14***99	Cylinder & Lines Group-Shear	1
14***20	Cylinder Group-Hydraulic	1
14***25	Mounting Group-Cylinder	1
14***29	Lines Group-Cylinder	1

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144-0960 Cylinder & Lines Gp-Shear

14***60	Cylinder & Lines Group-Shear	1
14***44	Cylinder Group-Hydraulic	1
14***48	Mounting Group-Cylinder	1
14***52	Lines Group-Cylinder	1

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144-0989 Cylinder & Lines Gp-Shear

14***89	Cylinder & Lines Group-Shear	1
14***26	Cylinder Group-Hydraulic	1
14***31	Fuel Filter; Sieve, Fuel Filter, Mounting Group-Cylinder	1
14***36	Lines Group-Cylinder	1

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152-3849 Cylinder & Lines Gp-Shear

15***84	Cylinder Group-Hydraulic	1
15***99	Lines Group-Cylinder	1
15***01	Mounting Group-Cylinder	1
15***49	Cylinder & Lines Group-Shear	1

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144-0966 Cylinder & Lines Gp-Shear

14***66	Cylinder & Lines Group-Shear	1
14***27	Cylinder Group-Shear	1
14***32	Mounting Group-Cylinder	1
14***37	Lines Group-Cylinder	1

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144-0979 Cylinder & Lines Gp-Shear

14***79	Cylinder & Lines Group-Shear	1
14***94	Cylinder Group-Hydraulic	1
14***99	Mounting Group-Cylinder	1
14***05	Lines Group-Cylinder	1

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144-0974 Cylinder & Lines Gp-Shear

14***74	Cylinder & Lines Group-Shear	1
14***42	Cylinder Group-Hydraulic	1
14***47	Mounting Group-Cylinder	1
14***52	Lines Group-Cylinder	1

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152-3684 Cylinder Gp-Hydraulic

03***25	Ring-Backup	2
09***33	Seal-O-Ring; (Id=209.30mm)	1
10***86	Ring-Retaining	1
12***61	Bearing-Sleeve	1

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144-3742 Cylinder Gp-Hydraulic

09***77	Setscrew-Socket	1
14***31	Ring-Retaining	4
14***42	Cylinder Group-Hydraulic	1
14***44	Kit-Seal	1

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144-4194 Cylinder Gp-Hydraulic

09***13	Ring	4
09***77	Setscrew-Socket	1
14***94	Cylinder Group-Hydraulic	1
14***97	Bearing	2

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160-8244 Cylinder Gp-Hydraulic -Y

00***50	Seal-O-Ring	1
10***96	Ring-Retaining	4
10***25	Seal As	1
10***29	Ring-Backup	2

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144-6126 Cylinder Gp-Hydraulic

09***77	Setscrew-Socket	1
10***60	Ring-Retaining	4
14***06	Bolt-Socket Head; (M20x2.5x140-mm)	18
14***26	Cylinder Group-Hydraulic	1

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145-3750 Cylinder Gp-Hydraulic

03***25	Ring-Backup	1
09***33	Seal-O-Ring; (Id=209.30mm)	1
10***86	Ring-Retaining	1
12***61	Bearing-Sleeve	1

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144-6020 Cylinder Gp-Hydraulic

10***96	Ring-Retaining	4
14***20	Cylinder Group-Hydraulic	1
14***22	Seal Set	1
14***23	Bearing	2

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158-3051 Cylinder Gp-Hydraulic

03***25	Ring-Backup	2
08***91	Ring-Backup	1
08***93	Ring-Retaining	1
08***96	Seal-U-Cup	1

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144-2744 Cylinder Gp-Hydraulic

14***44	Cylinder Group-Hydraulic	1
14***45	Seal Set	1
14***31	Ring-Retaining	4
14***45	Bearing	2

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144-3763 Cylinder Gp-Rotator

14***63	Cylinder Group-Rotator	1
14***22	Kit-Seal	1

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145-5740 Cylinder Gp-Rotator

14***71	Ring-Backup	1
14***70	Piston Group-Cylinder	1
14***15	Quad-Ring	1
14***67	Seal-O-Ring	1

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144-6144 Cylinder Gp-Rotator

14***44	Cylinder Group-Rotator	1
14***00	Kit-Seal	1

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144-4212 Cylinder Gp-Rotator

14***81	Piston Group-Cylinder	1
14***12	Cylinder Group-Rotator	1
14***13	Kit-Seal	1
14***19	Ring-Quad	1

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145-5752 Cylinder Gp-Rotator

13***80	Plug	2
14***79	Piston Group-Cylinder	1
14***17	Ring-Quad	1
14***80	Housing Group-Cylinder	1

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144-2488 Cylinder Gp-Rotator

03***92	Seal; (126.59mm Id)	2
14***88	Cylinder Group-Rotator	1
14***89	Seal Set	1
14***42	Ring	1

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145-5800 Cylinder Gp-Rotator

09***06	Bolt-Socket Head; (M16x2x80-mm)	12
14***60	Piston	1
14***19	Ring-Quad	1
14***65	Seal-O-Ring	1

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144-3144 Cylinder Gp-Rotator

14***44	Cylinder Group-Rotator	1
14***52	Kit-Seal	1

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145-3751 Cylinder Gp-Shear

03***25	Ring-Backup	2
08***48	Ring	1
09***31	Seal-O-Ring	1
10***86	Ring-Retaining	1

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144-3127 Cylinder Gp-Shear

09***77	Setscrew-Socket	1
14***27	Cylinder Group-Shear	1
14***31	Ring-Retaining	4
14***45	Bearing	2

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144-3752 Lines Gp-Cylinder

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	24
12***88	Flange-Split	28
14***16	Plate	2
14***60	Fitting	2

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144-2752 Lines Gp-Cylinder

14***52	Lines Group-Cylinder	1
14***60	Fitting	2
14***88	Connector	2
14***25	Hose As	1

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144-3137 Lines Gp-Cylinder

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	24
14***79	Lockwasher	24
14***73	Lockwasher	16
14***16	Plate	2

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152-3699 Lines Gp-Cylinder

14***88	Connector	2
14***98	Grommet	2
15***17	Hose As	2
15***54	Hose As	2

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144-6136 Lines Gp-Cylinder

14***88	Connector	2
14***36	Lines Group-Cylinder	1
14***31	Hose As	2
14***98	Grommet	2

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144-6029 Lines Gp-Cylinder

09***76	Nut; (M14x2-Thd)	16
14***60	Fitting	2
14***88	Connector	2
14***29	Lines Group-Cylinder	1

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144-4205 Lines Gp-Cylinder

14***05	Lines Group-Cylinder	1
14***88	Connector	2
14***32	Fitting	2
14***98	Grommet	2

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144-1034 Lines Gp-Rotator Cylinder

14***34	Lines Group-Rotator Cylinder	1
14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***62	Plate	1

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144-4451 Lines Gp-Rotator Cylinder

14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***62	Plate	1
14***51	Lines Group-Rotator Cylinder	1

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144-3773 Lines Gp-Rotator Cylinder

14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***68	Fitting	2
14***71	Pad	1

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144-6045 Lines Gp-Rotator Cylinder

11***11	Clamp	1
14***73	Lockwasher	4
14***68	Fitting	2
14***45	Lines Group-Rotator Cylinder	1

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144-3151 Lines Gp-Rotator Cylinder

14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***62	Plate	1
14***51	Lines Group-Rotator Cylinder	1

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145-6217 Lines Gp-Rotator Cylinder

14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***72	Plate	2
14***43	Hose As	2

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144-6150 Lines Gp-Rotator Cylinder

14***56	Valve Group-Pressure Control	1
14***61	Accumulator	2
14***62	Plate	1
14***50	Lines Group-Rotator Cylinder	1

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144-6025 Mounting Gp-Cylinder

14***69	Screw	4
14***25	Mounting Group-Cylinder	1
14***26	Pin As	1
14***27	Pin As	1

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152-3701 Mounting Gp-Cylinder

14***01	Pin As	1
14***02	Spacer; (120.5x150x7-mm Thk)	2
14***03	Spacer; (120.5x150x18-mm Thk)	2
14***07	Plate	2

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144-3747 Mounting Gp-Cylinder

14***42	Plate	2
14***47	Mounting Group-Cylinder	1
14***48	Pin As	1
14***49	Pin As	1

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144-2748 Mounting Gp-Cylinder

14***42	Plate	2
14***48	Mounting Group-Cylinder	1
14***49	Pin As	1
14***50	Pin As	1

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144-6131 Mounting Gp-Cylinder

14***31	Fuel Filter; Sieve, Fuel Filter, Mounting Group-Cylinder	1
14***32	Plug; Dummy Plug, Plug, Pin As	1
14***33	Pin As, Chain	1
14***34	Spacer; (160.5x190x7-mm Thk)	2

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144-4199 Mounting Gp-Cylinder

14***99	Mounting Group-Cylinder	1
14***00	Pin As	1
14***01	Pin As	1
14***02	Spacer; (120.5x150x7-mm Thk)	2

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144-3132 Mounting Gp-Cylinder

14***42	Plate	2
14***32	Mounting Group-Cylinder	1
14***33	Pin As	1
14***35	Spacer; (100.5x125x14.5-mm Thk)	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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149-4592 Valve Gp-Pressure Control

14***88	Connector	2
14***92	Valve Group-Pressure Control	1
17***45	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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165-8920 Valve Gp-Relief

16***20	Valve Group-Relief	1
17***12	Seal-Bonded	1
17***13	Seal-O-Ring	1
17***14	Ring-Backup	1

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179-1745 Valve Gp-Relief

17***45	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

173-3784 Plate & Film Gp

10***45	Film-Identification; (Cat)	2
11***51	Film-Stripe; (98 cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2

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164-6368 Plate & Film Gp

10***45	Film-Identification; (Cat)	2
11***51	Film-Stripe; (98 cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2

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164-7186 Plate & Film Gp

10***45	Film-Identification; (Cat)	2
11***51	Film-Stripe; (98 cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2

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164-7189 Plate & Film Gp

10***45	Film-Identification; (Cat)	2
11***51	Film-Stripe; (98 cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2

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158-2129 Plate & Film Gp

10***45	Film-Identification; (Cat)	2
11***51	Film-Stripe; (98 cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2

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164-7191 Plate & Film Gp

10***45	Film-Identification; (Cat)	2
11***51	Film-Stripe; (98 cm)	0
14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2

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Work Tool Arrangement

178-6218 Shear Ar-Hydraulic

14***99	Cylinder & Lines Group-Shear	1
14***00	Cylinder & Lines Group-Rotator	1
17***84	Plate & Film Group	1
17***18	Shear Ar-Hydraulic	1

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155-4962 Shear Ar-Hydraulic

14***79	Cylinder & Lines Group-Shear	1
14***80	Cylinder & Lines Group-Rotator	1
15***62	Shear Ar-Hydraulic	1
15***84	Housing Group-Shear	1

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144-0987 Shear Ar-Hydraulic

14***87	Shear Ar-Hydraulic	1
14***88	Housing Group-Shear	1
14***89	Cylinder & Lines Group-Shear	1
14***90	Cylinder & Lines Group-Rotator	1

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144-0977 Shear Ar-Hydraulic

14***77	Shear Ar-Hydraulic	1
14***78	Housing Group-Shear	1
14***79	Cylinder & Lines Group-Shear	1
14***80	Cylinder & Lines Group-Rotator	1

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144-0963 Shear Ar-Hydraulic

14***63	Shear Ar-Hydraulic	1
14***65	Housing Group-Shear	1
14***66	Cylinder & Lines Group-Shear	1
14***68	Cylinder & Lines Group-Rotator	1

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144-0997 Shear Ar-Hydraulic

14***97	Shear Ar-Hydraulic	1
14***98	Housing Group-Shear	1
14***99	Cylinder & Lines Group-Shear	1
14***00	Cylinder & Lines Group-Rotator	1

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144-3071 Shear Ar-Hydraulic

14***89	Cylinder & Lines Group-Shear	1
14***90	Cylinder & Lines Group-Rotator	1
14***71	Shear Ar-Hydraulic	1
14***72	Housing Group-Shear	1

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144-0958 Shear Ar-Hydraulic

14***58	Shear Ar-Hydraulic	1
14***59	Housing Group-Shear	1
14***60	Cylinder & Lines Group-Shear	1
14***61	Cylinder & Lines Group-Rotator	1

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152-3848 Shear Ar-Hydraulic

14***18	Cylinder & Lines Group-Rotator	1
15***86	Edge Group-Cutting	1
15***48	Shear Ar-Hydraulic	1
15***49	Cylinder & Lines Group-Shear	1

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144-3081 Shear Ar-Hydraulic

14***99	Cylinder & Lines Group-Shear	1
14***00	Cylinder & Lines Group-Rotator	1
14***81	Shear Ar-Hydraulic	1
14***82	Housing Group-Shear	1

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144-3062 Shear Ar-Hydraulic

14***74	Cylinder & Lines Group-Shear	1
14***75	Cylinder & Lines Group-Rotator	1
14***62	Shear Ar-Hydraulic	1
14***63	Housing Group-Shear	1

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144-3065 Shear Ar-Hydraulic

14***79	Cylinder & Lines Group-Shear	1
14***80	Cylinder & Lines Group-Rotator	1
14***65	Shear Ar-Hydraulic	1
14***66	Housing Group-Shear	1

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158-4935 Shear Ar-Hydraulic

14***89	Cylinder & Lines Group-Shear	1
14***90	Cylinder & Lines Group-Rotator	1
15***35	Shear Ar-Hydraulic	1
16***73	Housing Group-Shear	1

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144-0972 Shear Ar-Hydraulic

14***72	Shear Ar-Hydraulic	1
14***73	Housing Group-Shear	1
14***74	Cylinder & Lines Group-Shear	1
14***75	Cylinder & Lines Group-Rotator	1

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Work Tools

210-2310 Bracket Gp-Mounting

09***96	Bolt; (M20x2.5-Thd)	12
21***10	Bracket Group-Mounting	1
21***12	Bracket As	1
8T***23	Washer-Plated; (22x35x3.5-mm Thk)	24

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199-2418 Bracket Gp-Mounting

09***48	Nipple, Grease	2
09***79	Nut; (M36x4.0 Thd)	12
13***21	Bearing-Sleeve; (130.24mm Od)	2
19***18	Bracket Group-Mounting	1

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209-0575 Bracket Gp-Mounting

09***49	Washer; (22x60x6-mm Thk)	1
10***96	Bearing-Sleeve	2
20***75	Bracket Group-Mounting	1
20***76	Bracket As	1

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144-3073 Edge Gp-Cutting

14***73	Edge Group-Cutting	1
14***87	Screw-Flat Head	8
14***36	Tip-Wear	1
14***06	Shim; (1-mm Thk)	1

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144-0969 Edge Gp-Cutting

14***69	Edge Group-Cutting	1
14***15	Screw-Flat Head; (M20x2.5x100-mm)	2
14***87	Screw-Flat Head	8
14***10	Shim; (1mm Thk)	1

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144-0991 Edge Gp-Cutting

14***91	Edge Group-Cutting	1
14***87	Screw-Flat Head	8
14***06	Shim; (1-mm Thk)	1
14***07	Shim; (0.5-mm Thk)	1

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144-0976 Edge Gp-Cutting

14***76	Edge Group-Cutting	1
14***87	Screw-Flat Head	2
14***87	Screw-Flat Head	6
14***06	Shim; (1-mm Thk)	1

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152-3686 Edge Gp-Cutting

14***89	Screw-Flat Head	9
15***86	Edge Group-Cutting	1
15***91	Shim; (1mm Thk)	4
15***94	Shim; (.5mm Thk)	8

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178-6223 Edge Gp-Cutting

14***65	Screw-Flat Head; (M24x3x180mm)	13
14***66	Screw-Flat Head; (M24x3x160-mm)	3
14***96	Shim; (1mm Thk)	1
14***97	Shim; (.5mm Thk)	1

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144-0962 Edge Gp-Cutting

14***62	Edge Group-Cutting	1
14***87	Screw-Flat Head	4
14***98	Screw-Flat Head; (M20x2.5x90-mm)	2
14***15	Screw-Flat Head; (M20x2.5x100-mm)	4

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144-0981 Edge Gp-Cutting

14***81	Edge Group-Cutting	1
14***15	Screw-Flat Head; (M20x2.5x100-mm)	2
14***87	Screw-Flat Head	6
14***06	Shim; (1-mm Thk)	1

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144-3067 Edge Gp-Cutting

14***15	Screw-Flat Head; (M20x2.5x100-mm)	2
14***67	Edge Group-Cutting	1
14***87	Screw-Flat Head	12
14***36	Tip-Wear	1

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144-1001 Edge Gp-Cutting

14***01	Edge Group-Cutting	1
14***65	Screw-Flat Head; (M24x3x180mm)	13
14***66	Screw-Flat Head; (M24x3x160-mm)	2
14***90	Shim; (1mm Thk)	1

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156-4985 Edge Gp-Cutting

14***15	Screw-Flat Head; (M20x2.5x100-mm)	1
14***87	Screw-Flat Head	13
14***78	Lockwasher	14
15***68	Shim; (1-mm Thk)	2

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160-7476 Edge Gp-Cutting

14***87	Screw-Flat Head	8
14***81	Screw-Flat Head	6
14***78	Lockwasher	14
15***68	Shim; (1-mm Thk)	2

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144-3064 Edge Gp-Cutting

14***87	Screw-Flat Head	2
14***64	Edge Group-Cutting	1
14***87	Screw-Flat Head	12
14***36	Tip-Wear	1

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144-3083 Edge Gp-Cutting

14***83	Edge Group-Cutting	1
14***65	Screw-Flat Head; (M24x3x180mm)	14
14***66	Screw-Flat Head; (M24x3x160-mm)	2
14***90	Shim; (1mm Thk)	1

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S25 serial number reference

The PIN plate on an S25 shear is a stamped metal tag riveted to the shear frame or mounting bracket, not on an engine since the tool has none. Read the first 3 characters as the serial prefix (identifies model and assembly plant) and the following 5 digits as the unit sequence number within that prefix run.

Prefix	Identifies	Notes
2RW	S25 Shear-Demolition/Scrap (base line, part of S25/S225 family)	Passive hydraulic shear attachment, no engine or ECM; runs off carrier hydraulics. Listed range starts 2RW00001-UP. Only prefix tied to the S25 in available service-manual listings. Confirm exact production-year span and carrier-size fit with your dealer.

Frequently asked questions

What engine does the Caterpillar S25 use?

None. The S25 is a passive hydraulic attachment with no engine, ECM, or transmission of its own. Its jaw cylinder and rotator function (on rotating variants) are powered entirely by the hydraulic system of the host excavator carrier, typically in the 18 to 26 t class, that it is mounted to.

What is the operating weight of the Caterpillar S25?

Approximately 2.4 t (5,291 lb) for the shear attachment itself, not including the weight of the carrier it mounts to.

What replaced the Caterpillar S25?

No confirmed direct successor is documented. Caterpillar's legacy S25/S225 through S130/S2130 shear line was eventually followed in the catalog by a differently numbered S2000/S3000-series mobile scrap and demolition shear range, but no source ties a specific current model to the S25 as a direct one-to-one replacement.

What S25 owners discuss

What do operators say is the most common headache running an S25 shear day to day?

Matching the carrier's auxiliary hydraulic flow and pressure to the shear. Undersized flow slows the jaw cycle and leaves the cut feeling weak; oversized pressure past the shear's rated window stresses hoses, seals, and the pivot structure. Owners treat carrier matching as the first thing to confirm, not an afterthought.

How often do the jaw pivot pins and bushings need grease, and what happens if that slips?

Legacy shears like the S25 want pivot points greased at least once per shift, more often under heavy cycling. Skip it and the bushings gall and wear oversize, showing up as side-play or slop in the jaw. Once that slop sets in, the jaws no longer close square, so the blades meet off-plane and chew instead of shearing cleanly.

What are the telltale signs the shear blades are done and need replacing?

A rounded or dull cutting edge that no longer bites cleanly, small cracks radiating from the edge, and material that bends or tears rather than shears through. Operators also notice they have to work the jaw harder or re-position material for a second bite, both signs the edge geometry is gone.

Are there quirks specific to the S25/S225 legacy shear family compared with Cat's newer shear lineup?

Being an older, purely hydro-mechanical design with no onboard electronics, the S25 gives no fault codes or diagnostics. Every symptom shows up as mechanical feedback: hot pins, jaw slop, or a duller bite. Blade changes on this generation also take longer than on Cat's later quick-change jaw designs, so plan more downtime for a swap.

Can the S25 be run on a smaller or larger carrier than it was matched to?

Owners stick close to the shear's rated operating weight class and hydraulic window. A carrier that's too small lugs the pump and slows cycle time; one that's too large can overpower the pins and pivot structure faster than the duty cycle was designed for. Neither extreme is worth the shortcut.

Why does cutting force seem to fade over time even with a perfectly healthy carrier?

Three things erode bite strength independent of the carrier: the blade edge rounding off, wear building up in the jaw-closing linkage so the true closing gap opens up, and pivot bushing wear letting the jaws twist slightly off-plane so full clamp force never reaches the cutting point evenly.

What should I check before buying a used S25?

Walk the jaw through a full open-close cycle and watch for lateral play or twist at the pivot. Check blade edges for rounding, chipping, or prior weld repair. Look at cylinder rods for scoring or seepage, and inspect the head casting around the pivot bosses for hairline cracks from years of clamping loads. Confirm the blades fitted are the correct matched pair and not mismatched replacements. Because pivot bore wear and casting cracks are structural and safety-critical, have your dealer verify pivot bore tolerances and inspect for stress cracking before putting the shear back into full-load service.

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

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