Caterpillarwork toolshear-demolition/scrap
Caterpillar S385B
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar S385B is a passive hydraulic mobile scrap and demolition shear, part of Caterpillar's B-series shear line for large excavators. It carries no engine, ECM, fuel system, or undercarriage of its own — it is a pin-on attachment, offered in boom-mount or stick-mount (direct pin or quick-coupler) configurations, that draws its cutting and rotation power entirely from the dedicated work-tool hydraulic circuit of its carrier excavator. The S385B is matched to the 385C-class excavator. It has an 880 mm (34.6 in) jaw opening and a rated shear force at the throat of 12,631 kN (1,420 short tons), delivered through a straight lower jaw and piercing upper jaw with a 360-degree hydraulic rotator. Cat's factory literature does not publish a standalone S385B operating weight, but the shear sits in roughly the same 7 to 8.5 metric ton attachment class as its direct successor, varying with boom-mount versus stick-mount bracketing.
The S385B updated Caterpillar's earlier unlettered large-shear generation with a redesigned jaw and blade geometry, an adjustable hub for field jaw realignment, larger service access panels, and a hardened weld-on piercing tip that can be re-hardfaced rather than replaced outright. In the third quarter of 2020, Caterpillar replaced the S385B with the S385C, which kept the same jaw opening and rotation system but switched to a bolt-on, fully reversible piercing tip for faster field changeouts without welding. Cat has since pushed its shear lineup further with a newer rotating-shear naming scheme, leaving the S385B two full generations behind current production. That gap is exactly why the S385B still matters in the used and parts market: a large population of these shears remains active in scrap yards and demolition fleets on 385C-class carriers, and buyers sourcing blades, pivot bushings, pins, and seals need to know their unit uses B-series weld-on tip hardware, not the bolt-on tip system fitted to the later C-series.
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 S385B specifications
Engine
| Power source | No onboard engine. Passive hydraulically driven mobile shear; cutting and rotation are powered entirely by the host excavator's hydraulic system through auxiliary work-tool circuits. |
| Emissions tier | Not applicable - the work tool itself carries no engine or emissions certification. |
Weights
| Operating weight | Not published in available factory documentation for this specific model. Shears in this size class (matched to 385C L class carriers) typically run in the mid-single-digit-tonne range with mounting bracket included, but an exact figure for this model was not found - confirm with your dealer for the precise weight and configuration. |
| Weight basis | Family convention quotes shear weight with mounting bracket included; boom-mount brackets typically add weight versus stick-mount brackets. |
Dimensions
| Jaw opening | 880 mm (34.6 in) |
| Overall length, height, width | Not published in available factory documentation for this specific model - verify with your dealer. |
| Jaw depth, jaw width (fixed/moving) | Not published in available factory documentation for this specific model. |
Performance
| Shear force at throat (innermost jaw point) | 12 631 kN (1,420 short tons) |
| Shear force at tip and at primary blade/apex | Not published in available factory documentation for this specific model. |
| Cutting and rotation cycle times | Not published in available factory documentation for this specific model. |
| Hydraulic cutting circuit flow and pressure | Not published in available factory documentation for this specific model. |
| Compatible carrier excavator (stick-mount) | 385C L class hydraulic excavator |
Service capacities (summary)
| Hydraulic system | No separate reservoir. The shear draws hydraulic oil from the host excavator's system; fluid type and capacity follow the carrier excavator's own specification. |
| Fuel, engine oil, cooling system | Not applicable - the work tool has no engine, fuel tank, or cooling system of its own. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
S385B fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not applicable — the S385B is a passive hydraulic work tool with no onboard engine | None; the shear carries no engine or ECM of its own |
| Cooling system | Not applicable — no engine, radiator, or coolant circuit fitted to the shear | None |
| Fuel tank | Not applicable — the shear has no fuel system | None |
| Transmission / powertrain compartments | Not applicable — no transmission; the shear has no independent drivetrain | None |
| Final drives | Not applicable — the shear has no final drives; it is carried on the host excavator's stick | None |
| Hydraulic system (jaw cylinders and rotation drive) | No dedicated reservoir — the shear has no oil tank of its own. It draws hydraulic flow and volume from the host excavator's auxiliary/high-pressure circuit, so working capacity tracks the carrier machine's hydraulic tank, not the attachment | Runs on whatever hydraulic oil the host excavator's system specifies. Cat guidance points to Cat HYDO Advanced (or Cat BIO HYDO Advanced where biodegradable fluid is required) at the viscosity grade matched to the carrier's ambient-temperature chart; match the shear's oil to the carrier machine's fluid, don't mix a different spec into the shared circuit |
| Rotation drive (gerotor-type motor) | Sealed hydraulic motor, no separate gear-oil sump for the operator to check or fill; lubrication comes from the shared hydraulic oil passing through it | Same hydraulic oil as the jaw circuit — no distinct fluid or capacity is called out for the rotation motor |
| Axles / differentials | Not applicable — the shear has none | None |
| Grease — pivot pins, jaw bushings, blade guides | Apply at each fitting until fresh grease purges at the joint; no volume/capacity figure is published, only an interval (grease daily under normal duty, more often in heavy demolition or wet/abrasive conditions) | Cat Extreme Application Grease (moly-fortified, NLGI 2) for the high-load pin and bushing joints; Cat Advanced 3Moly Grease is the alternate moly-additive option Cat lists for medium-load, medium-speed pin joints on this class of work tool. No separate low-temperature grade is broken out for the shear itself — cold-climate grease selection follows the same guidance as the host machine's pin/bushing points |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar S385B maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 50 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the S385B beyond the schedule
Predictive Maintenance & Fluid Analysis
The S385B has no engine oil to sample, but the carrier's work-tool hydraulic circuit is the shear's lifeblood. Pull periodic hydraulic fluid samples from that circuit and watch for metal content, which flags early rotator seal or cylinder wear before a leak shows up. Track blade edge life against wear trend rather than a fixed number, log hub bushing clearance over time, and note any rotator seal weep early — it predicts a slewing bearing or seal job well before it becomes a shutdown.
Corrective & Common Repairs
Typical S385B repairs center on the wear points that take the cutting load: swapping worn blade sets and the bolt-on drop-side wear plate, re-hardfacing or replacing the weld-on piercing tip once it dulls or chips, and resealing the shear cylinder when rod scoring causes cylinder leak-down or slow cycle times. Jaw slop from a worn hub pin and bushing is common on high-hour units and is corrected by replacing the pin and bushing together, then resetting alignment through the adjustable hub.
Overhaul & Rebuild Points
A full S385B overhaul centers on the pivot hub and rotator. Rebuild the hub with new pin and bushings to restore jaw alignment, inspect and renew the rotator slewing ring and seals if bearing play or grease migration shows up, and reseal or rebore the shear cylinder if the bore is scored. Inspect welds at the jaw throat and mounting bracket for fatigue cracking under load, since this is a high-stress structural attachment with no suspension to absorb shock loads.
Seasonal & Environment Servicing
Switch to a cold-weather grease grade for the pivot pin and hub bushings before winter work, since a stiff grease film accelerates pin and bushing wear in freezing conditions. Clear ice and packed debris from the jaw throat before starting a shift, and protect exposed rotator seals and the cylinder rod from scrap-yard grit and moisture with regular wipe-downs. In humid or coastal environments, keep pins, blades, and exposed structural steel coated to slow corrosion during outdoor storage between jobs.
S385B fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| No S385B-specific fault codes | The S385B is a passive hydraulic demolition/scrap shear built around a cutting-jaw cylinder, pivot pin and (on rotating variants) a hydraulic rotator. It carries no engine, ECM, sensors or display, so it cannot generate or store a diagnostic code. | Design intent - the tool is powered entirely by the host excavator's hydraulic system. | Do not look for a code reader on the shear itself; diagnose through the host carrier. |
| No code - weak or slow jaw closing force | Symptom, not a stored code: the jaw cycles slower than normal or fails to reach full cutting force. | Worn or scored cylinder seals causing internal bypass, low supply pressure from the carrier's work-tool circuit, or a relief valve set below spec. | Pressure-test the shear's hydraulic inlet against the spec sheet, inspect the cylinder for internal leakage, and confirm the carrier's auxiliary/work-tool relief pressure. |
| No code - jaw will not fully open or close | Symptom indicating restricted or lost flow to the shear circuit rather than an electronic fault. | Clogged hydraulic filter, low reservoir oil, collapsed hose, or a quick-coupler not fully engaged. | Check carrier fluid level and filter condition, inspect hoses and couplers for restriction or damage, and confirm full coupler engagement before cycling. |
| No code - carrier displays an active or logged work-tool circuit fault | Any electronic fault tied to running a shear is logged on the host excavator's own ECM under its work-tool/auxiliary hydraulic pump circuit, shown on the carrier's monitor as an MID-CID-FMI or SPN-FMI code, not on the shear. | Carrier-side pump, relief valve, or pressure-sensor issue on the auxiliary/work-tool circuit feeding the shear. | Read the carrier's cab display or connect Cat Electronic Technician (Cat ET) to the carrier to pull any active/logged code, then service the identified carrier component. |
| No code - rotator turns slowly, unevenly, or not at all (rotating variants only) | On rotating-jaw S385B configurations, 360-degree positioning is driven by a hydraulic rotator motor; sluggish or absent rotation is a mechanical/hydraulic symptom, not a displayed fault. | Rotator motor wear, contaminated case-drain oil, or a worn slew bearing/gear. | Check case-drain flow and rotator motor condition per the shear's service literature, and verify the carrier's dedicated rotation circuit pressure if the machine has one. |
| No code - excess jaw pin or bushing play | Wear at the jaw pivot pin and bushings is a manually inspected mechanical condition; the tool has no sensor to flag it. | Normal wear accumulated over cutting cycles. | Measure pin and bushing clearance at the scheduled maintenance interval and replace or shim per the work-tool maintenance guide. |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
S385B attachments & work tools
Host excavator size class
S385B is the largest unit in the Cat B-series mobile shear line, built for large excavators. Boom-mount duty pairs with excavators in roughly the 45-70 t class (345/365-class predecessors of the later 345D L/365C L/374D L boom-mount hosts). Stick-mount duty for primary demolition pairs with the largest class, around 85-99 t (385B/385B L, later 385C/385C L and UHD demolition-configured units).
Mounting / coupler system
Pin-on mounting only, no quick-coupler; the shear pins directly to the excavator boom (scrap processing) or stick (demolition), using standardized pin sizing shared across Cat excavator work-tool linkage. A 360-degree hydraulic rotator is standard between the shear body and the mounting bracket, letting the jaws be spun to any cutting angle without repositioning the carrier.
Jaw and blade design
Straight lower jaw with a hardened, replaceable piercing tip on the upper jaw; the straight lower jaw is meant to compress and flatten steel sections before the cut to raise cutting force along the full jaw length. Knife/blade segments are bolt-on and field-replaceable, with an adjustable hub and gap-adjustment feature to compensate for blade wear over time without full jaw replacement.
Hydraulic circuit / arrangement
Runs off the excavator's dedicated shear/work-tool hydraulic circuit (auxiliary high-pressure line), not the standard bucket circuit; host excavators need the demolition or high-flow work-tool arrangement plumbed to stick or boom to run the rotator and jaw cylinders. Series shears of this size are built for fast cycle times, with later-series units in the family using an integrated speed valve to shorten cycle time under load.
Guarding and maintenance features
Housing design covers the rotation cylinder and jaw cylinder rod, removing the need for separate bolt-on rod guards in demolition debris. Jaw and rotation locks and large service access panels are part of the standard configuration for safe field maintenance and blade changes.
Family / succession context
S385B sits at the top of the S320B/S325B/S340B/S365B/S385B mobile scrap-and-demolition shear family, collectively spanning excavators from about 10 t up to 60 t and beyond depending on model. It was superseded by the S385C, which carries a very similar jaw opening and the same boom-mount/stick-mount host pattern; do not carry S385C-only features (bolt-on reversible piercing tips, specific D/L-series host pairings) back onto the S385B without a source that names the B model directly.
All S385B assemblies by section
Every catalogued assembly group for the Caterpillar S385B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Frame And Body
318-6212 Housing Gp-Shear
| 14***16 | Connector Group | 2 |
| 14***51 | Elbow Group | 1 |
| 16***54 | Seal | 1 |
327-5370 Housing Gp-Shear
| 14***16 | Connector Group | 2 |
| 14***51 | Elbow Group | 1 |
| 16***54 | Seal | 1 |
240-5915 Housing Gp-Shear
| 14***16 | Connector Group | 1 |
| 16***24 | Hose As | 1 |
| 17***64 | Hose As | 1 |
226-0714 Housing Gp-Shear
| 14***16 | Connector Group | 1 |
| 18***03 | Hose As | 1 |
| 19***85 | Hose As | 1 |
325-6440 Housing Gp-Shear
| 14***16 | Connector Group | 2 |
| 14***51 | Elbow Group | 1 |
| 16***54 | Seal | 1 |
310-2108 Housing Gp-Shear
| 14***06 | Bolt-Socket Head; (M20x2.5x140-mm) | 5 |
| 20***25 | Valve Group-Speed Control | 1 |
| 22***13 | Cylinder & Lines Group-Shear | 1 |
317-6006 Housing Gp-Shear
| 14***06 | Bolt-Socket Head; (M20x2.5x140-mm) | 5 |
| 20***25 | Valve Group-Speed Control | 1 |
| 24***97 | Cylinder & Lines Group-Shear | 1 |
Hydraulic System
318-0062 Cylinder & Lines Gp-Shear
| 14***16 | Connector Group | 1 |
| 18***15 | Hose As | 1 |
| 18***16 | Hose As | 1 |
321-3765 Cylinder & Lines Gp-Shear
| 09***48 | Nipple, Grease | 1 |
| 09***06 | Bolt-Socket Head; (M16x2x80-mm) | 24 |
| 16***71 | Bushing | 2 |
240-5497 Cylinder & Lines Gp-Shear
| 14***06 | Bolt-Socket Head; (M20x2.5x140-mm) | 5 |
| 20***25 | Valve Group-Speed Control | 1 |
| 24***97 | Cylinder & Lines Group-Shear | 1 |
228-8613 Cylinder & Lines Gp-Shear
| 14***06 | Bolt-Socket Head; (M20x2.5x140-mm) | 5 |
| 20***25 | Valve Group-Speed Control | 1 |
| 22***13 | Cylinder & Lines Group-Shear | 1 |
317-5991 Cylinder & Valve Gp
| 16***16 | Seal | 1 |
| 17***21 | Adapter As | 1 |
| 1P***05 | Seal (Check Valve Outlet) | 2 |
227-3768 Cylinder & Valve Gp
| 16***16 | Seal | 1 |
| 17***21 | Adapter As | 1 |
| 1P***05 | Seal (Check Valve Outlet) | 2 |
318-0061 Cylinder & Valve Gp
| 16***54 | Seal | 1 |
| 17***82 | Bolt-Socket Head; (M24x3x150-mm) | 29 |
| 20***98 | Lock | 1 |
240-5496 Cylinder & Valve Gp
| 16***16 | Seal | 1 |
| 17***23 | Plug As | 4 |
| 17***23 | Bushing | 2 |
327-5371 Cylinder & Valve Gp
| 09***48 | Nipple, Grease | 1 |
| 16***87 | Bushing | 2 |
| 17***50 | Pin-Spring | 1 |
317-8054 Cylinder & Valve Gp
| 16***16 | Seal | 1 |
| 17***23 | Plug As | 4 |
| 17***23 | Bushing | 2 |
321-2531 Cylinder & Valve Gp
| 09***48 | Nipple, Grease | 1 |
| 14***84 | Bolt-Socket Head; (M20x2.5x110-mm) | 22 |
| 16***55 | Bushing | 2 |
327-5372 Cylinder Gp-Hydraulic
| 13***38 | Hose As. | 2 |
| 1P***04 | Seal - Rectangular (45mm Dia) | 2 |
| 1P***67 | Flange-Half (43.31 mm Id) | 4 |
321-2534 Cylinder Gp-Hydraulic
| 1P***04 | Seal - Rectangular (45mm Dia) | 2 |
| 1P***67 | Flange-Half (43.31 mm Id) | 4 |
| 21***02 | Hose As | 2 |
321-2532 Cylinder Gp-Hydraulic
| 1P***04 | Seal - Rectangular (45mm Dia) | 2 |
| 1P***67 | Flange-Half (43.31 mm Id) | 4 |
| 21***27 | Hose As | 2 |
317-5993 Cylinder Gp-Hydraulic
| 14***45 | Connector As | 2 |
| 20***74 | Fitting Group-Hydraulic; (Quick Disconnect, Female) | 2 |
| 2M***80 | Seal--To Connector Pump Outlet | 1 |
317-5992 Cylinder Gp-Hydraulic
| 16***54 | Seal | 1 |
| 17***82 | Bolt-Socket Head; (M24x3x150-mm) | 29 |
| 20***98 | Lock | 1 |
327-5373 Cylinder Gp-Shear
| 09***70 | Bolt-Socket Hd; (M12 X 1.75 X 45) | 16 |
| 1P***04 | Seal - Rectangular (45mm Dia) | 4 |
| 1P***67 | Flange-Half (43.31 mm Id) | 8 |
240-5484 Cylinder Gp-Shear
| 16***46 | Bar-Clamp | 2 |
| 16***90 | Clip; (Slot) | 2 |
| 16***91 | Clip; (Tab) | 2 |
227-4144 Cylinder Gp-Shear
| 10***16 | Hose As | 2 |
| 1P***04 | Seal - Rectangular (45mm Dia) | 4 |
| 1P***67 | Flange-Half (43.31 mm Id) | 4 |
317-6403 Cylinder Gp-Shear
| 1P***04 | Seal - Rectangular (45mm Dia) | 2 |
| 1P***67 | Flange-Half (43.31 mm Id) | 4 |
| 23***81 | Hose As | 2 |
317-6404 Cylinder Gp-Shear
| 25***45 | Hose As | 2 |
| 31***04 | Cylinder Group-Shear | 1 |
| 3K***60 | Seal Pilot Manifold On; Seal To Boom Check Valve Drain | 2 |
270-7425 Fitting Gp-Hydraulic
| 1P***05 | Seal (Check Valve Outlet) | 4 |
| 20***08 | Hose As | 2 |
| 25***89 | Hose As | 1 |
239-9251 Lines Gp-Connecting
| 14***68 | Hose As | 2 |
| 14***45 | Connector As | 2 |
| 23***51 | Lines Group-Connecting | 1 |
270-7585 Lines Gp-Connecting
| 09***73 | Bolt; (Socket Head) (M12x1.75x60mm) | 16 |
| 12***28 | Adaptor - Includes:- | 4 |
| 12***24 | Seal-O-Ring; (12.37mm Id) | 4 |
211-9059 Lines Gp-Connecting
| 14***59 | Hose As | 2 |
| 21***59 | Lines Group-Connecting | 1 |
| 5P***77 | Flange-Half | 4 |
270-3926 Lines Gp-Connecting
| 14***20 | Bolt-Socket Head; (M6x1x75-mm) | 4 |
| 17***73 | Motor Group-Gerotor | 1 |
| 17***77 | Gear-Drive; (15-Teeth) | 1 |
273-9212 Lines Gp-Connecting
| 16***43 | Seal | 1 |
| 17***57 | Plug As | 4 |
| 17***14 | Stator | 1 |
221-0855 Lines Gp-Connecting
| 22***55 | Lines Group-Connecting | 1 |
| 27***24 | Lines Group-Connecting | 1 |
| 27***25 | Lines Group-Connecting | 1 |
221-0857 Lines Gp-Connecting
| 14***45 | Connector As | 2 |
| 22***57 | Lines Group-Connecting | 1 |
| 24***08 | Hose As | 2 |
216-1733 Lines Gp-Connecting
| 14***68 | Hose As | 2 |
| 14***45 | Connector As | 2 |
| 21***33 | Lines Group-Connecting | 1 |
270-3924 Lines Gp-Connecting
| 1P***04 | Seal - Rectangular (45mm Dia) | 2 |
| 1P***05 | Seal (Check Valve Outlet) | 2 |
| 27***24 | Lines Group-Connecting | 1 |
270-7586 Lines Gp-Connecting
| 08***72 | Seal-O-Ring | 1 |
| 14***28 | Connector Assem. | 2 |
| 14***35 | Connect Group; (Each Includes) | 4 |
239-9250 Lines Gp-Connecting
| 23***50 | Lines Group-Connecting | 1 |
| 27***47 | Lines Group-Connecting | 1 |
| 27***48 | Lines Group-Connecting | 1 |
273-7602 Lines Gp-Connecting
| 08***72 | Seal-O-Ring | 1 |
| 14***28 | Connector Assem. | 2 |
| 14***35 | Connect Group; (Each Includes) | 4 |
221-0856 Lines Gp-Connecting
| 21***73 | Hose As | 2 |
| 22***56 | Lines Group-Connecting | 1 |
| 5P***77 | Flange-Half | 4 |
270-4347 Lines Gp-Connecting
| 17***21 | Kit-Housing | 1 |
| 17***22 | Shaft-Output | 1 |
| 17***25 | Key-Square | 1 |
239-9252 Lines Gp-Connecting
| 23***52 | Lines Group-Connecting | 1 |
| 24***96 | Lines Group-Connecting | 1 |
| 27***85 | Lines Group-Connecting | 1 |
270-4349 Lines Gp-Connecting
| 09***73 | Bolt; (Socket Head) (M12x1.75x60mm) | 8 |
| 12***28 | Adaptor - Includes:- | 4 |
| 12***24 | Seal-O-Ring; (12.37mm Id) | 4 |
244-6796 Lines Gp-Connecting
| 1P***04 | Seal - Rectangular (45mm Dia) | 3 |
| 1P***05 | Seal (Check Valve Outlet) | 1 |
| 1P***67 | Flange-Half (43.31 mm Id) | 2 |
302-8171 Lines Gp-Connecting
| 14***09 | Plug As-Sto | 2 |
| 17***42 | Rotor | 1 |
| 17***43 | Ring | 1 |
270-3925 Lines Gp-Connecting
| 14***20 | Bolt-Socket Head; (M6x1x75-mm) | 4 |
| 27***25 | Lines Group-Connecting | 1 |
| 7Y***19 | Seal-O-Ring (Id=12.37mm) | 2 |
258-9890 Lines Gp-Connecting
| 1P***04 | Seal - Rectangular (45mm Dia) | 1 |
| 1P***05 | Seal (Check Valve Outlet) | 3 |
| 1P***67 | Flange-Half (43.31 mm Id) | 2 |
270-4348 Lines Gp-Connecting
| 17***73 | Motor Group-Gerotor | 1 |
| 17***76 | Ring-Mounting | 1 |
| 17***77 | Gear-Drive; (15-Teeth) | 1 |
341-2542 Lines Gp-Connecting
| 13***54 | Plug As | 3 |
| 20***87 | Slack Adjuster Group | 1 |
| 20***88 | Valve Group-Control | 1 |
170-2174 Manifold Gp-Control
| 17***74 | Manifold Group-Control | 1 |
| 17***30 | Plug | 6 |
| 17***31 | Valve | 1 |
318-8396 Motor & Manifold Gp-Rotator
| 09***01 | Bolt-Socket Head; (M8x1.25x40-mm) | 4 |
| 17***55 | Seal-O-Ring | 2 |
| 20***74 | Bolt-Socket Head; (M16x2x55-mm) | 8 |
170-2173 Motor Gp-Gerotor
| 14***86 | Fitting As | 2 |
| 15***44 | Seal | 1 |
| 17***73 | Motor Group-Gerotor | 1 |
216-7650 Motor Gp-Gerotor
| 14***86 | Fitting As | 2 |
| 15***44 | Seal | 1 |
| 17***77 | Fitting As; (Quick Disconnect, Male) | 4 |
266-7382 Rotator Gp-Hydraulic
| 20***41 | Washer; (21x63.5x22-mm Thk) | 2 |
| 24***85 | Ring | 1 |
| 24***86 | Wrench; (Lock, 140) | 1 |
314-9134 Rotator Gp-Hydraulic
| 20***41 | Washer; (21x63.5x22-mm Thk) | 2 |
| 24***86 | Wrench; (Lock, 140) | 1 |
| 24***76 | Wrench; (Lock, 160) | 1 |
243-1695 Rotator Gp-Hydraulic
| 16***15 | Ring-Adjustment | 1 |
| 24***95 | Rotator Group-Hydraulic | 1 |
| 31***60 | Pipe | 1 |
323-8109 Rotator Gp-Hydraulic
| 19***01 | Adjusting Ring | 1 |
| 32***09 | Rotator Group-Hydraulic | 1 |
| 32***80 | Template | 1 |
318-8397 Swivel Gp
| 15***96 | Film-Notice; (Lift Eye Location) | 3 |
| 22***69 | Film-Warning; (Do Not Operate, Read Omm) | 2 |
| 24***58 | Film-Identification; (Cat S365b) | 2 |
265-6468 Swivel Gp
| 16***93 | Ring-Adjustment | 1 |
| 26***68 | Swivel Group | 1 |
| 31***60 | Pipe | 1 |
208-8451 Valve Gp-Control
| 15***96 | Film-Notice; (Lift Eye Location) | 3 |
| 20***51 | Valve Group-Control | 1 |
| 22***69 | Film-Warning; (Do Not Operate, Read Omm) | 2 |
170-3229 Valve Gp-Speed Control
| 13***55 | Setscrew; (M4x0.7x8-mm) | 2 |
| 17***29 | Valve Group-Speed Control | 1 |
| 23***60 | Film-Notice; (Lift Eye Location) | 4 |
208-5125 Valve Gp-Speed Control
| 13***55 | Setscrew; (M4x0.7x8-mm) | 2 |
| 20***25 | Valve Group-Speed Control | 1 |
| 23***60 | Film-Notice; (Lift Eye Location) | 4 |
Service Equipment And Supplies
317-8059 Kit-Maintenance
| 31***59 | Kit-Maintenance | 1 |
240-5914 Kit-Maintenance
| 24***14 | Kit-Maintenance | 1 |
327-8979 Kit-Maintenance
| 32***79 | Kit-Maintenance | 1 |
325-6438 Kit-Maintenance
| 32***38 | Kit-Maintenance | 1 |
327-8983 Kit-Maintenance
| 32***83 | Kit-Maintenance | 1 |
226-0718 Kit-Maintenance
| 13***55 | Setscrew; (M4x0.7x8-mm) | 2 |
| 22***18 | Kit-Maintenance | 1 |
| 23***60 | Film-Notice; (Lift Eye Location) | 4 |
327-5368 Kit-Maintenance
| 32***68 | Kit-Maintenance | 1 |
200-2962 Lock Gp-Shear
| 20***62 | Lock Group-Shear | 1 |
327-8989 Plate & Film Gp
| 32***89 | Plate & Film Group | 1 |
327-8988 Plate & Film Gp
| 32***88 | Plate & Film Group | 1 |
226-0717 Plate & Film Gp
| 22***17 | Plate & Film Group | 1 |
327-8987 Plate & Film Gp
| 32***87 | Plate & Film Group | 1 |
240-5913 Plate & Film Gp
| 24***13 | Plate & Film Group | 1 |
Work Tool Arrangement
317-5990 Shear Ar-Hydraulic
| 31***08 | Housing Group-Shear, Flexible Hose | 1 |
| 31***34 | Rotator Group-Hydraulic | 1 |
| 31***90 | Shear Ar-Hydraulic | 1 |
240-5911 Shear Ar-Hydraulic
| 24***11 | Shear Ar-Hydraulic | 1 |
| 24***12 | Shear Group-Hydraulic | 1 |
| 24***13 | Plate & Film Group | 1 |
318-7240 Shear Ar-Hydraulic
| 31***27 | Shear Group-Hydraulic | 1 |
| 31***40 | Shear Ar-Hydraulic | 1 |
| 32***79 | Kit-Maintenance | 1 |
317-5989 Shear Ar-Hydraulic
| 31***89 | Shear Ar-Hydraulic | 1 |
| 31***90 | Shear Ar-Hydraulic | 1 |
| 31***59 | Kit-Maintenance | 1 |
318-6201 Shear Ar-Hydraulic
| 31***01 | Shear Ar-Hydraulic | 1 |
| 31***11 | Shear Group-Hydraulic | 1 |
| 32***83 | Kit-Maintenance | 1 |
226-0716 Shear Ar-Hydraulic
| 22***13 | Shear Group-Hydraulic | 1 |
| 22***16 | Shear Ar-Hydraulic | 1 |
| 22***18 | Kit-Maintenance | 1 |
Work Tools
199-1259 Bracket Gp-Mounting
| 15***21 | Lockwasher | 2 |
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 10 |
| 19***59 | Bracket Group-Mounting | 1 |
344-2681 Bracket Gp-Mounting
| 34***81 | Bracket Group-Mounting | 1 |
| 8T***32 | Nut (M16 X 2 Thd); (M16x2.00 Thd) | 2 |
| 8T***75 | Bolt; (M16x2x90-mm) | 1 |
209-1776 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 16 |
| 20***76 | Bracket Group-Mounting | 1 |
| 22***11 | Bracket Group-Mounting | 1 |
233-4676 Bracket Gp-Mounting
| 15***18 | Lockwasher | 6 |
| 17***33 | Cover | 1 |
| 23***76 | Bracket Group-Mounting | 1 |
220-9951 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 14 |
| 22***51 | Bracket Group-Mounting | 1 |
| 22***12 | Bracket Group-Mounting | 1 |
257-1041 Bracket Gp-Mounting
| 15***28 | Bearing-Sleeve | 2 |
| 15***19 | Lockwasher | 16 |
| 17***61 | Cover | 2 |
254-5861 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 14 |
| 25***61 | Bracket Group-Mounting | 1 |
| 25***09 | Bracket Group-Mounting | 1 |
222-8512 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 14 |
| 22***12 | Bracket Group-Mounting | 1 |
| 23***76 | Bracket Group-Mounting | 1 |
169-4968 Bracket Gp-Mounting
| 16***68 | Bracket Group-Mounting | 1 |
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 14 |
| 23***05 | Bracket As | 1 |
256-3109 Bracket Gp-Mounting
| 15***18 | Lockwasher | 6 |
| 17***33 | Cover | 1 |
| 25***09 | Bracket Group-Mounting | 1 |
254-5862 Bracket Gp-Mounting
| 14***33 | Boss-Tapped; (Tapped) | 1 |
| 15***19 | Lockwasher | 16 |
| 18***74 | Cover | 2 |
269-7525 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 44 |
| 26***25 | Bracket Group-Mounting | 1 |
| 27***13 | Bracket Group-Mounting | 1 |
257-4110 Bracket Gp-Mounting
| 15***18 | Lockwasher | 8 |
| 19***96 | Cover | 1 |
| 25***10 | Bracket Group-Mounting | 1 |
254-4463 Bracket Gp-Mounting
| 14***90 | Bearing-Sleeve; (140.26mm Od) | 2 |
| 15***18 | Lockwasher | 16 |
| 17***61 | Cover | 2 |
222-8511 Bracket Gp-Mounting
| 14***90 | Bearing-Sleeve; (140.26mm Od) | 2 |
| 15***19 | Lockwasher | 16 |
| 17***61 | Cover | 2 |
269-7527 Bracket Gp-Mounting
| 15***18 | Lockwasher | 8 |
| 19***96 | Cover | 1 |
| 26***27 | Bracket Group-Mounting | 1 |
190-5435 Bracket Gp-Mounting
| 13***17 | Bearing-Sleeve; (116.23mm Od) | 2 |
| 15***19 | Lockwasher | 16 |
| 17***61 | Cover | 2 |
233-4675 Bracket Gp-Mounting
| 13***55 | Setscrew; (M4x0.7x8-mm) | 2 |
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 20***59 | Plate-Serial Number | 1 |
256-3108 Bracket Gp-Mounting
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 25***08 | Bracket Group-Mounting | 1 |
| 25***99 | Bracket Group-Mounting | 1 |
318-8150 Bracket Gp-Mounting
| 14***78 | Lockwasher | 3 |
| 17***93 | Bolt-Socket Head; (M20x2.5x80-mm) | 3 |
| 22***49 | Plate-Wear | 1 |
180-1286 Bracket Gp-Mounting
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 18***86 | Bracket Group-Mounting | 1 |
| 19***94 | Bracket Group-Mounting | 1 |
257-4109 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 44 |
| 25***09 | Bracket Group-Mounting | 1 |
| 26***27 | Bracket Group-Mounting | 1 |
222-8507 Bracket Gp-Mounting
| 13***17 | Bearing-Sleeve; (116.23mm Od) | 2 |
| 15***19 | Lockwasher | 16 |
| 18***74 | Cover | 2 |
318-8149 Bracket Gp-Mounting
| 15***21 | Lockwasher | 3 |
| 23***74 | Bushing | 10 |
| 25***68 | Plate-Wear | 1 |
179-1648 Bracket Gp-Mounting
| 15***18 | Lockwasher | 6 |
| 17***46 | Bracket As | 1 |
| 17***33 | Cover | 1 |
282-2864 Bracket Gp-Mounting
| 22***63 | Shim; (1-mm Thk) | 4 |
| 22***64 | Shim; (1.5-mm Thk) | 4 |
| 22***67 | Edge-Cutting | 2 |
363-7700 Bracket Gp-Mounting
| 31***34 | Rotator Group-Hydraulic | 1 |
| 31***12 | Housing Group-Shear | 1 |
| 36***00 | Bracket Group-Mounting | 1 |
222-8508 Bracket Gp-Mounting
| 15***19 | Lockwasher | 16 |
| 18***74 | Cover | 2 |
| 22***08 | Bracket Group-Mounting | 1 |
246-9991 Bracket Gp-Mounting
| 09***49 | Washer; (22x60x6-mm Thk) | 2 |
| 13***55 | Setscrew; (M4x0.7x8-mm) | 2 |
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 14 |
347-1016 Bracket Gp-Mounting
| 24***15 | Housing Group-Shear | 1 |
| 24***95 | Rotator Group-Hydraulic | 1 |
| 34***16 | Bracket Group-Mounting | 1 |
253-7830 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 46 |
| 25***30 | Bracket Group-Mounting | 1 |
| 25***62 | Bracket Group-Mounting | 1 |
282-0532 Bracket Gp-Mounting
| 13***17 | Bearing-Sleeve; (116.23mm Od) | 2 |
| 15***19 | Lockwasher | 16 |
| 18***74 | Cover | 2 |
270-1912 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 42 |
| 27***12 | Bracket Group-Mounting | 1 |
| 27***79 | Bracket Group-Mounting | 1 |
257-0098 Bracket Gp-Mounting
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 25***98 | Bracket Group-Mounting | 1 |
| 25***02 | Bracket Group-Mounting | 1 |
270-1913 Bracket Gp-Mounting
| 15***18 | Lockwasher | 8 |
| 19***96 | Cover | 1 |
| 27***13 | Bracket Group-Mounting | 1 |
362-8489 Bracket Gp-Mounting
| 31***06 | Housing Group-Shear | 1 |
| 32***09 | Rotator Group-Hydraulic | 1 |
| 36***89 | Bracket Group-Mounting | 1 |
199-1258 Bracket Gp-Mounting
| 13***55 | Setscrew; (M4x0.7x8-mm) | 2 |
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 14 |
| 19***58 | Bracket Group-Mounting | 1 |
271-0111 Bracket Gp-Mounting
| 10***96 | Bearing-Sleeve | 2 |
| 13***55 | Setscrew; (M4x0.7x8-mm) | 2 |
| 15***19 | Lockwasher | 16 |
282-2863 Bracket Gp-Mounting
| 22***62 | Shim; (1-mm Thk) | 4 |
| 22***63 | Shim; (1-mm Thk) | 4 |
| 22***64 | Shim; (1.5-mm Thk) | 4 |
272-4879 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 16 |
| 27***79 | Bracket Group-Mounting | 1 |
| 31***50 | Bracket Group-Mounting | 1 |
175-0339 Bracket Gp-Mounting
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 17***39 | Bracket Group-Mounting | 1 |
| 17***48 | Bracket Group-Mounting | 1 |
257-0101 Bracket Gp-Mounting
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 25***01 | Bracket Group-Mounting | 1 |
| 25***47 | Bracket Group-Mounting | 1 |
247-0536 Bracket Gp-Mounting
| 09***49 | Washer; (22x60x6-mm Thk) | 1 |
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 14 |
| 20***71 | Washer; (26x90x8-mm Thk) | 1 |
257-0102 Bracket Gp-Mounting
| 15***18 | Lockwasher | 6 |
| 17***33 | Cover | 1 |
| 25***02 | Bracket Group-Mounting | 1 |
257-1047 Bracket Gp-Mounting
| 16***82 | Bolt-Socket Head; (M24x3x70-mm) | 46 |
| 25***47 | Bracket Group-Mounting | 1 |
| 25***09 | Bracket Group-Mounting | 1 |
193-9094 Bracket Gp-Mounting
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 19***94 | Bracket Group-Mounting | 1 |
| 19***58 | Bracket Group-Mounting | 1 |
257-0099 Bracket Gp-Mounting
| 15***18 | Lockwasher | 6 |
| 17***33 | Cover | 1 |
| 25***99 | Bracket Group-Mounting | 1 |
222-8513 Bracket Gp-Mounting
| 09***54 | Seal; (Id=79.85mm) | 2 |
| 13***59 | Bearing-Sleeve | 2 |
| 15***19 | Lockwasher | 16 |
189-0311 Bracket Gp-Mounting
| 15***19 | Lockwasher | 16 |
| 17***61 | Cover | 2 |
| 18***11 | Bracket Group-Mounting | 1 |
222-8506 Bracket Gp-Mounting
| 17***90 | Bolt-Socket Head; (M20x2.5x70-mm) | 36 |
| 22***06 | Bracket Group-Mounting | 1 |
| 22***13 | Bracket Group-Mounting | 1 |
315-0192 Edge Gp-Cutting
| 15***19 | Lockwasher | 2 |
| 15***21 | Lockwasher | 30 |
| 16***12 | Clip; (Slot) | 2 |
317-8040 Edge Gp-Cutting
| 09***05 | Bolt-Socket Head; (M16x2x100-mm) | 8 |
| 15***19 | Lockwasher | 2 |
| 15***21 | Lockwasher | 28 |
227-3769 Edge Gp-Cutting
| 22***69 | Edge Group-Cutting | 1 |
| 26***82 | Rotator Group-Hydraulic | 1 |
| 32***40 | Housing Group-Shear | 1 |
240-6810 Edge Gp-Cutting
| 24***10 | Edge Group-Cutting | 1 |
| 24***95 | Rotator Group-Hydraulic | 1 |
| 32***70 | Housing Group-Shear | 1 |
322-1929 Edge Gp-Cutting
| 15***19 | Lockwasher | 2 |
| 15***21 | Lockwasher | 4 |
| 16***41 | Bushing | 2 |
344-1058 Mounting Gp-Work Tool
| 15***21 | Lockwasher | 3 |
| 23***74 | Bushing | 10 |
| 25***69 | Plate-Wear | 1 |
347-0502 Mounting Gp-Work Tool
| 22***14 | Housing Group-Shear | 1 |
| 26***82 | Rotator Group-Hydraulic | 1 |
| 34***02 | Mounting Group-Work Tool | 1 |
327-5369 Shear Gp-Hydraulic
| 16***16 | Seal | 1 |
| 17***21 | Adapter As | 1 |
| 1P***05 | Seal (Check Valve Outlet) | 2 |
318-6211 Shear Gp-Hydraulic
| 09***05 | Bolt-Socket Head; (M16x2x100-mm) | 8 |
| 15***21 | Lockwasher | 12 |
| 16***12 | Clip; (Slot) | 2 |
226-0713 Shear Gp-Hydraulic
| 15***19 | Lockwasher | 2 |
| 15***21 | Lockwasher | 2 |
| 17***15 | Bushing | 2 |
240-5912 Shear Gp-Hydraulic
| 10***40 | Plug | 1 |
| 15***19 | Lockwasher | 2 |
| 15***21 | Lockwasher | 4 |
317-8027 Shear Gp-Hydraulic
| 15***19 | Lockwasher | 2 |
| 15***21 | Lockwasher | 14 |
| 16***12 | Clip; (Slot) | 2 |
325-6439 Shear Gp-Hydraulic
| 16***16 | Seal | 1 |
| 17***21 | Adapter As | 1 |
| 1P***05 | Seal (Check Valve Outlet) | 2 |
S385B serial number reference
The PIN plate for the S385B is mounted on the shear body near the pivot/mounting frame, not on the host excavator; it is a passive attachment with no separate engine plate. Read the first 3 characters as the prefix (identifies the specific shear model and build series) and the following 5 digits as the sequence number within that prefix.
| Prefix | Identifies | Notes |
|---|---|---|
| C1B | S385B demolition/scrap shear, passive work tool (no engine/ECM), boom or stick mounted on a host excavator such as the 385C L | Range C1B00001-UP is listed on the S385B's own parts-catalog page within the shared S320B/S325B/S340B/S365B/S385B shear parts manual. Sibling S365B carries its own distinct prefix (C1A) in the same manual family, supporting that each sibling owns a separate prefix rather than sharing one. This range comes from a single catalog source - confirm with your dealer before relying on it for parts lookup. |
Frequently asked questions
What engine does the Cat S385B have?
None. The S385B is a passive hydraulic work tool with no engine, ECM, or fuel system of its own. It runs entirely off the dedicated work-tool hydraulic circuit of its carrier excavator, a 385C-class machine, which supplies the flow and pressure for both cutting and 360-degree rotation.
What is the operating weight of the S385B?
Caterpillar's factory literature does not publish a standalone S385B weight figure. Its same-class C-series successor lists 7,975 kg (17,580 lb) stick-mount and 8,320 kg (18,345 lb) boom-mount including the mounting bracket, which gives a reasonable range for the S385B's mass class — confirm the exact figure for your bracket configuration with your dealer.
What replaced the Cat S385B?
The Cat S385C, released in the third quarter of 2020. It kept the same 880 mm (34.6 in) jaw opening and 360-degree rotation as the S385B but replaced the weld-on piercing tip with a bolt-on, fully reversible tip system for faster field changeouts.
What S385B owners discuss
What carrier is the S385B matched to, and does hydraulic flow matter?
The S385B is a stick-mounted demolition shear built for the 385-class excavator platform. It carries no engine or onboard hydraulics of its own -- every function, open/close and rotate, draws off the carrier's auxiliary and rotate circuits. Owners report that cutting force and cycle speed are only as good as the carrier's flow and pressure setup: a shear sized for that platform mounted on an undersized or mismatched carrier will cut slow, stall mid-bite, or lose rotation torque. Confirm the carrier's auxiliary flow/pressure preset matches the shear's design range before buying it or swapping it onto a different excavator; have your dealer verify the flow/pressure programming is correct for this specific tool.
What wear pattern on the jaw and blades signals the shear needs attention?
Mechanics watch wear pattern more than wear amount. Rolled or rounded cutting edges mean material is tearing instead of shearing cleanly, usually because the jaw gap has opened up from wear. Chipping or fractured edges concentrated near the point where material first contacts the blade usually mean clearance is too tight, not too loose. Uneven wear along the blade length points to a gap that is not consistent across the full edge, often from pin and bushing wear letting the moving jaw twist under load. Blades and the bolt-on piercing tip on this shear family are reversible and replaceable with hand tools, so catching the wear pattern early keeps it a shop-floor job instead of a bigger repair.
How much play is normal in the upper jaw pivot pin and bushings?
Essentially none. Owners and techs check pivot play the same way as any excavator linkage pin: the joint should take up snug with no wiggle or rattle as the jaw is worked through its full stroke. Measurable play at the main jaw pivot means the bushing has worn undersize, and because that pin carries the full cutting force on every cycle, play there accelerates quickly once it starts. Daily greasing of the pivot is the standard preventive step users cite; skipped lubrication, dirt ingestion, and misalignment are the most commonly reported causes of premature pin and bushing wear on shears of this size.
Are cracks around the jaw pivot hub a known issue on this class of shear?
Yes -- cracking initiating around the upper jaw pivot housing and propagating across the inside of the jaw casting is a documented failure point on heavy-duty demolition shears after extended service. Repair procedures call for a reinforcement plate welded around the pivot hub with controlled preheat, interpass temperature, and a slow post-weld cooldown to avoid re-cracking the casting. This is a structural repair on a load-bearing pivot -- have your dealer verify the weld procedure and inspect the completed repair before the shear goes back into service.
What causes the rotator to leak or lose smoothness?
The rotate function runs off a separate medium-pressure circuit on the carrier, driving a rotary motor and gearbox at the shear's mount. Reported symptoms of a tired rotator include weeping seals at the motor/gearbox interface, hesitation or notchy rotation, and gradual loss of rotate torque under load. Contaminated hydraulic oil is the most frequently cited root cause -- dirt or moisture in the fluid scores seals and valve spools over time -- so users tie rotator health directly to how disciplined the previous owner was about oil and filter changes on both the carrier and the tool circuit.
Does the S385B have any electronics or sensors that commonly fail?
No. As a passive shear it carries no engine, ECM, or onboard sensors -- anything electronic that affects its operation lives on the carrier, such as flow and pressure preset selection on the excavator's monitor and the auxiliary valve solenoids. What owners sometimes describe as a shear problem, slow cycle time, weak force, or jerky rotation, often traces back to the carrier's tool preset being programmed wrong or reverting to a default setting rather than a fault in the shear itself. Before chasing a hydraulic fault on the tool, confirm the carrier's flow/pressure preset for that specific attachment is selected and holding; have your dealer verify the preset programming if it will not hold.
What should you check before buying a used S385B?
Community consensus for used shears comes down to the same short list every time: jaw alignment (does it close square, or does the moving jaw walk sideways under load), blade and piercing-tip condition (rolled edges, chipping, remaining reversible life), pivot pin and bushing play (should be snug, not loose), cylinder condition (rod scoring, cushioning, drift under load), and rotator seal and gearbox condition (leaks, torque loss, notchy rotation). Also confirm the shear's hydraulic flow and pressure requirement actually matches the carrier it is being sold with, or the carrier you intend to run it on -- a shear pulled off a mismatched host machine can look fine sitting on the ground and still underperform once mounted. Have your dealer verify pivot and cylinder condition with the attachment loaded before final purchase.
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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