Caterpillarwork toolgrapple-mechanical

Caterpillar G112

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar G112 is a passive mechanical grapple, an excavator work tool with no engine, no ECM, and no hydraulic reservoir or pump of its own. It mounts to the stick and linkage of a 320-class carrier excavator (B-linkage configuration) and is actuated entirely through the host machine's own bucket cylinder and hydraulic circuit, opening and closing the jaw without any dedicated plumbing on the tool itself. The G112 belongs to a documented Mechanical Grapple parts family alongside the G115, G125, and G140, sized to progressively larger carriers and jaw capacities on the same mechanical-linkage design. It is a separate product line from the later, similarly named G112B and its lettered Contractors' Grapple siblings (G107B through G185B): the two share a jaw concept and a close name but are different catalog items with different parts lists, and the G112B is not a documented successor to the G112.

Mechanical grapples like the G112 are a workhorse tool in demolition, scrap handling, and material sorting because they need no auxiliary hydraulic lines, no added valving, and no plumbing changes to run on a compatible carrier: they bolt to the stick and use the bucket circuit the excavator already has. That simplicity is also why units stay in service for decades and why the secondary market for this class of attachment runs on rebuilt jaws, pins, bushings, and tine tips rather than complete new tools. The G112 itself is an older, thinly documented catalog entry. Current Caterpillar literature and dealer specification sheets focus on the later B-series Contractors' Grapples, so published dimensional and weight data specific to the G112 is limited. Anyone buying or running a G112 should treat it as a wear-parts and rebuild candidate first, verifying fit and condition against the physical unit rather than assuming figures published for the G112B or later grapples carry over.

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 G112 specifications

Engine

Power source	None. The G112 is a passive mechanical grapple attachment for excavators, not a self-powered unit. It carries no engine, ECM, or emissions rating.
Operating power	Actuated through the host excavator's bucket-linkage cylinder. Contractors'-grapple-family attachments of this type are built to work off the carrier's existing bucket circuit and do not add a hydraulic function of their own.

Weights

Operating weight	Not published in available dealer or catalog literature specific to the G112. Not documented for this exact model — verify with your Cat dealer.
Note on related model	A separate, later-series grapple carries the G112B designation with its own published weight figure. That figure belongs to G112B, not to the base G112, and is not applied here per contamination-guard rules.

Dimensions

Jaw opening / width / height	Not documented in a source that ties the figures specifically to the G112 (as distinct from G112B or other family members). Verify with your Cat dealer or the applicable parts manual for your serial range.
Carrier class	Parts-catalog records tie the G112 to a 320-class excavator with B-linkage mounting, as part of a combined G112/G115/G125/G140 Mechanical Grapple family. This is a separate catalog line from the later G112B Contractors' Grapple, which uses 312-class linkage - the two share a similar name but are different products.

Performance

Travel speed / gradeability	Not applicable. The G112 is a towed/mounted work tool with no travel drive of its own.
Material capacity	Not documented for the G112 specifically in sources checked. Cat's contractors'-grapple family rates capacity to SAE J2754, but no figure could be confirmed as belonging to this exact model.
Grasping action	Family-typical two-over-three interlocking tine design intended to penetrate, grasp, and retain loose and bulky material; wear tips, wrapper, and strips typically use abrasion-resistant steel on grapples of this class.

Service capacities (summary)

Fuel, hydraulic, oil, coolant capacities

Not applicable. As a passive attachment with no engine and no dedicated hydraulic circuit of its own, the G112 has no service fluid capacities to publish.

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

G112 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable — the G112 Contractors' Grapple has no onboard engine	Not applicable
Cooling system	Not applicable — no engine, so no cooling circuit	Not applicable
Fuel tank	Not applicable — no fuel system on the grapple itself	Not applicable
Transmission / powertrain compartments	Not applicable — no transmission or powertrain on the grapple	Not applicable
Final drives	Not applicable — no final drives on the grapple	Not applicable
Hydraulic system and tank	Not applicable — the grapple's jaw cylinder draws off the host excavator's own hydraulic circuit and tank through a single double-acting auxiliary line; no dedicated reservoir or fill capacity belongs to the tool itself	Follow the host carrier's own OMM hydraulic oil recommendation and viscosity-by-climate chart (for a Cat 320-class carrier, typically Cat HYDO Advanced 10 or Cat BIO HYDO Advanced, graded to ambient temperature), since the grapple has no separate reservoir
Axles / differentials	Not applicable — no axles or differentials on the grapple	Not applicable
Grease points (jaw pivot pins and bushings)	Spec only — no fill volume; service each pivot pin and bushing through its grease fitting at the scheduled interval until fresh grease purges at the joint	General Cat multipurpose grease (NLGI 2 class) at each pin and bushing point, per standard Cat work-tool lubrication practice; a G112-specific branded chart with cold-climate alternates is not published in available literature — confirm the current recommendation with your Cat dealer

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

Caterpillar G112 maintenance schedule

Service interval	Tasks
Every 10 h	Grease every pin and bushing joint on the grapple and mounting linkage at the start of each shift, more often in mud, sand, or demolition debris. Visually check tines, jaw, and mounting yoke for cracked welds, bent tips, or a missing tine point before putting the tool to work. Cycle the jaw fully open and closed with no load to check for binding, uneven travel, or looseness at the pivots. Confirm all mounting pins, retaining bolts, and lock plates are tight and no pin is backing out of its bore. Clean packed material off pivot joints and grease zerks before greasing so grease reaches the bushing, not just the joint face.
Every 250 h	Check pin-to-bushing clearance at every pivot with a bar or feel-check and log any joint showing visible play. Inspect tine tips and cutting edges for a wear step-down; compare remaining material against a new tip. Inspect all structural welds on the jaw, tines, and mounting yoke for hairline cracking under a wire-brushed, well-lit check. Torque-check mounting bolts and pin retainers to spec and replace any deformed lock hardware.
Every 500 h	Pull and inspect wear bushings at the main pivot and jaw linkage points for scoring or egg-shaped wear. Replace any tine tip worn past the manufacturer wear limit; replace tips as a matched set so the jaw closes evenly. Inspect mounting ears and pin bores for elongation or bore wear beyond factory tolerance. Check for grease weeping past pin seals at each joint, which signals a failed seal needing replacement.
Every 1,000 h	Remove pins at the main pivot and mounting joints for a full dimensional check against factory tolerance; replace pins and bushings together as matched sets where worn. Inspect the full weld structure of the frame and jaw closely for cracking, using dye-penetrant or magnetic-particle check if a hairline crack is suspected. Check jaw alignment and closing geometry against a new-unit reference; straighten or replace a bent tine bar found out of alignment. Recoat exposed structural steel where paint has worn through to bare metal at wear points to control corrosion.
Every 2,000 h	Perform a full teardown inspection of every pin and bushing joint in the grapple and mounting linkage; replace worn sets before they reach failure. Inspect the main frame weldment for fatigue cracking at high-stress radii, particularly the jaw root and mounting yoke. Evaluate whether the jaw and tine assembly needs a rebuild (new tines, bushings, pins) or has reached retirement based on total wear and crack-repair history. Confirm the grapple still matches the host excavator's linkage geometry after cumulative wear and that rated working load is unaffected.
Every 4,000 h	Conduct a full structural and dimensional survey of the grapple, comparing wear on all pins, bushings, and tine mounts against cumulative service history. Rebuild or replace the jaw assembly if bushing bores are oversized beyond repair limits or welds show repeated crack repairs. Reassess the attachment for continued service versus retirement based on total pin, bushing, and frame condition. Update service records with every replaced wear component so future interval checks are measured against the rebuilt baseline.

Servicing the G112 beyond the schedule

Predictive Maintenance & Wear Inspection

The G112 has no fluid to sample and no engine to monitor, so predictive maintenance means tracking mechanical wear. Check pin-to-bushing play at the main pivot and mounting joints on a set schedule and log clearance trends over time. Watch tine tips for a visible wear step against a new tip, and inspect welds at the jaw root and mounting yoke for hairline cracking before it spreads. Rising pivot play, or cracking that returns after repair, signals a joint nearing the end of its service life.

Corrective & Common Repairs

Common G112 repairs center on cracked welds, worn pin bores, and damaged tines, not engine or hydraulic faults, since it has neither. Grind a cracked weld back to sound metal, confirm the crack has not run into the base casting, then rebuild the joint to its original weld profile before recoating. Elongated pin bores get bushed or bored back to tolerance rather than welded shut. Bent or chipped tines can be straightened or swapped individually for minor wear; heavier tip loss calls for a matched-set replacement.

Overhaul & Rebuild Points

A full G112 overhaul centers on the pivot and mounting joints that carry every load cycle passed down from the host excavator's bucket circuit. Replace pins and bushings as matched sets, not one at a time, so clearances stay even across the jaw and tine bar. Inspect the frame weldment for fatigue cracking at high-stress radii before returning the tool to service, and bush or re-machine any oversized bore rather than running it loose. A cracked, repeatedly repaired frame is a retirement signal, not another repair.

Seasonal & Environment Servicing

Because the G112 runs on grease and mechanical fit rather than fluids, seasonal servicing means adjusting grease frequency to conditions. Wet or muddy demolition sites wash grease out of pin joints fast and need more frequent greasing than the standard shift interval. Sandy or gritty material accelerates bushing wear by trapping grit at the joint, so wipe joints clean before greasing. In cold weather, use a low-temperature-rated grease so it still reaches the bushing surface, and check pin retainers more often since cold contraction can loosen fits.

G112 attachments & work tools

Machine type and job

The G112 is a passive Mechanical Grapple work tool for hydraulic excavators, not a self-propelled machine. It has no engine, ECM, or fault codes of its own. It is a separate catalog item from the later, similarly named G112B Contractors' Grapple.

Host excavator class

Parts-catalog records tie the G112 to a 320-class excavator fitted with B-linkage mounting. Confirm exact carrier compatibility against the current linkage chart for a specific host machine and serial range.

Mechanical Grapple family / size range

The G112 is part of a Mechanical Grapple family alongside the G115, G125, and G140, sized to progressively larger carriers on the same mechanical-linkage design. This is a distinct catalog line from the lettered Contractors' Grapple family (G107B through G185B), which includes the similarly named G112B.

Mounting / coupler system

Pinned directly to the excavator stick and linkage using the machine's standard bucket pins, or carried on a Pin Grabber-style pin coupler sized to the same linkage class. No dedicated grapple-specific quick coupler is required.

Hydraulic arrangement

Mechanically actuated off the excavator's existing bucket cylinder and linkage geometry. No auxiliary hydraulic lines, valves, or plumbing kit are needed - the base machine's standard bucket circuit closes and opens the jaws.

Jaw and pin retention design

Uses a pin-hub jaw arrangement typical of this class of mechanical grapple, so jaw halves stay connected when the main pin is pulled for service or linkage changes. Tine tips are typically field-replaceable wear parts, letting a worn set be swapped without discarding the jaw structure.

Cross-linkage sharing

Grapples in this family can be shared across similarly sized excavators by swapping the mounting pins to match each carrier's linkage, letting one grapple body serve more than one machine model within the same size class.

Current catalog naming

No confirmed modern replacement is documented for the G112 in Caterpillar's current attachment catalog. The G112B Contractors' Grapple is a separate, unrelated product with its own parts list, not a documented successor.

Primary applications

Structural demolition, general material handling and sorting, and loading or unloading rock, scrap, pipe, and other debris. It is a fixed mechanical grapple, not a rotating or tilting tool.

All G112 assemblies by section

Every catalogued assembly group for the Caterpillar G112. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

169-5655 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
16***12	Bracket Group-Mounting	1
16***55	Mounting Group-Grapple	1

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169-5652 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
16***11	Bracket Group-Mounting	1
16***52	Mounting Group-Grapple	1

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169-4592 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
16***92	Mounting Group-Grapple	1
16***71	Bracket Group-Mounting	1

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169-4596 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***96	Mounting Group-Grapple	1
16***80	Bracket Group-Mounting	1

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169-4597 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***97	Mounting Group-Grapple	1
16***81	Bracket Group-Mounting	1

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192-7202 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
19***54	Bracket Group-Mounting	1
19***02	Mounting Group-Grapple	1

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169-4408 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***08	Mounting Group-Grapple	1
16***72	Bracket Group-Mounting	1

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169-4589 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
16***89	Mounting Group-Grapple	1
16***67	Bracket Group-Mounting	1

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169-4593 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***93	Mounting Group-Grapple	1
16***74	Bracket Group-Mounting	1

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185-7338 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
18***38	Mounting Group-Grapple	1
18***94	Bracket Group-Mounting	1

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185-7337 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
18***37	Mounting Group-Grapple	1
18***93	Bracket Group-Mounting	1

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169-5656 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***08	Bracket Group-Mounting	1
16***56	Mounting Group-Grapple	1

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169-4399 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
16***99	Mounting Group-Grapple	1
16***68	Bracket Group-Mounting	1

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188-8473 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
18***73	Mounting Group-Grapple	1
18***74	Bracket Group-Mounting	1

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169-4590 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
16***90	Mounting Group-Grapple	1
16***69	Bracket Group-Mounting	1

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169-4595 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***95	Mounting Group-Grapple	1
16***78	Bracket Group-Mounting	1

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192-7203 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
19***35	Bracket Group-Mounting	1
19***03	Mounting Group-Grapple	1

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169-5657 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***07	Bracket Group-Mounting	1
16***57	Mounting Group-Grapple	1

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169-4591 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
16***91	Mounting Group-Grapple	1
16***70	Bracket Group-Mounting	1

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190-9778 Mounting Gp-Grapple

16***71	Bracket Group-Mounting	1
18***11	Bracket Group-Mounting	1
19***78	Mounting Group-Grapple	1

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169-4594 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***94	Mounting Group-Grapple	1
16***75	Bracket Group-Mounting	1

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169-4422 Mounting Gp-Grapple

16***38	Bracket Group-Mounting	1
16***22	Mounting Group-Grapple	1
16***76	Bracket Group-Mounting	1

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Service Equipment And Supplies

169-4409 Film Gp

15***96	Film-Notice; (Lift Eye Location)	2
15***44	Film-Warning; (Flying Debris)	2
15***53	Film-Information; (Read Omm)	2
15***54	Film-Warning; (Alert)(Safety Alert)	2

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169-4423 Film Gp

15***96	Film-Notice; (Lift Eye Location)	2
15***44	Film-Warning; (Flying Debris)	2
15***53	Film-Information; (Read Omm)	2
15***54	Film-Warning; (Alert)(Safety Alert)	2

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169-4400 Film Gp

15***96	Film-Notice; (Lift Eye Location)	2
15***44	Film-Warning; (Flying Debris)	2
15***53	Film-Information; (Read Omm)	2
15***54	Film-Warning; (Alert)(Safety Alert)	2

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169-3984 Film Gp

15***96	Film-Notice; (Lift Eye Location)	2
15***44	Film-Warning; (Flying Debris)	2
15***53	Film-Information; (Read Omm)	2
15***54	Film-Warning; (Alert)(Safety Alert)	2

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Work Tool Arrangement

169-5302 Grapple Ar-Mechanical

16***02	Grapple Ar-Mechanical	1
16***55	Mounting Group-Grapple	1
17***04	Grapple Group	1

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192-7200 Grapple Ar-Mechanical

17***21	Grapple Group	1
19***00	Grapple Ar-Mechanical	1
19***03	Mounting Group-Grapple	1

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169-4584 Grapple Ar-Mechanical

16***84	Grapple Ar-Mechanical	1
16***93	Mounting Group-Grapple	1
17***16	Grapple Group	1

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169-4396 Grapple Ar-Mechanical

16***96	Grapple Ar-Mechanical	1
16***99	Mounting Group-Grapple	1
17***09	Grapple Group	1

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169-5305 Grapple Ar-Mechanical

16***05	Grapple Ar-Mechanical	1
16***56	Mounting Group-Grapple	1
17***16	Grapple Group	1

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169-5303 Grapple Ar-Mechanical

16***03	Grapple Ar-Mechanical	1
16***52	Mounting Group-Grapple	1
17***09	Grapple Group	1

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169-4406 Grapple Ar-Mechanical

16***06	Grapple Ar-Mechanical	1
16***08	Mounting Group-Grapple	1
17***16	Grapple Group	1

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169-4586 Grapple Ar-Mechanical

16***86	Grapple Ar-Mechanical	1
16***95	Mounting Group-Grapple	1
17***21	Grapple Group	1

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169-4588 Grapple Ar-Mechanical

16***88	Grapple Ar-Mechanical	1
16***97	Mounting Group-Grapple	1
17***21	Grapple Group	1

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188-8472 Grapple Ar-Mechanical

17***21	Grapple Group	1
18***72	Grapple Ar-Mechanical	1
18***73	Mounting Group-Grapple	1

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169-5301 Grapple Ar-Mechanical

16***01	Grapple Ar-Mechanical	1
16***52	Mounting Group-Grapple	1
17***04	Grapple Group	1

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169-4581 Grapple Ar-Mechanical

16***81	Grapple Ar-Mechanical	1
16***90	Mounting Group-Grapple	1
17***09	Grapple Group	1

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169-4420 Grapple Ar-Mechanical

16***20	Grapple Ar-Mechanical	1
16***22	Mounting Group-Grapple	1
17***21	Grapple Group	1

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169-4587 Grapple Ar-Mechanical

16***87	Grapple Ar-Mechanical	1
16***96	Mounting Group-Grapple	1
17***21	Grapple Group	1

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191-0545 Grapple Ar-Mechanical

17***09	Grapple Group	1
19***78	Mounting Group-Grapple	1
19***45	Grapple Ar-Mechanical	1

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192-7199 Grapple Ar-Mechanical

17***16	Grapple Group	1
19***99	Grapple Ar-Mechanical	1
19***02	Mounting Group-Grapple	1

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169-4582 Grapple Ar-Mechanical

16***82	Grapple Ar-Mechanical	1
16***91	Mounting Group-Grapple	1
17***09	Grapple Group	1

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169-5306 Grapple Ar-Mechanical

16***06	Grapple Ar-Mechanical	1
16***57	Mounting Group-Grapple	1
17***21	Grapple Group	1

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185-7336 Grapple Ar-Mechanical

17***21	Grapple Group	1
18***36	Grapple Ar-Mechanical	1
18***38	Mounting Group-Grapple	1

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192-7198 Grapple Ar-Mechanical

17***04	Grapple Group	1
19***78	Mounting Group-Grapple	1
19***98	Grapple Ar-Mechanical	1

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169-4585 Grapple Ar-Mechanical

16***85	Grapple Ar-Mechanical	1
16***94	Mounting Group-Grapple	1
17***16	Grapple Group	1

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169-4580 Grapple Ar-Mechanical

16***80	Grapple Ar-Mechanical	1
16***89	Mounting Group-Grapple	1
17***04	Grapple Group	1

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169-4583 Grapple Ar-Mechanical

16***83	Grapple Ar-Mechanical	1
16***92	Mounting Group-Grapple	1
17***09	Grapple Group	1

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169-5304 Grapple Ar-Mechanical

16***04	Grapple Ar-Mechanical	1
16***55	Mounting Group-Grapple	1
17***09	Grapple Group	1

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185-7829 Grapple Ar-Mechanical

16***99	Mounting Group-Grapple	1
17***04	Grapple Group	1
18***29	Grapple Ar-Mechanical	1

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185-7335 Grapple Ar-Mechanical

17***21	Grapple Group	1
18***35	Grapple Ar-Mechanical	1
18***37	Mounting Group-Grapple	1

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195-0617 List-Grapple Ar

16***96	Grapple Ar-Mechanical	1
16***99	Mounting Group-Grapple	1
16***06	Grapple Ar-Mechanical	1
16***08	Mounting Group-Grapple	1

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Work Tools

169-5312 Bracket Gp-Mounting

15***18	Lockwasher	8
16***12	Bracket Group-Mounting	1
16***15	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14

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169-4972 Bracket Gp-Mounting

16***72	Bracket Group-Mounting	1
16***92	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	2

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169-4974 Bracket Gp-Mounting

16***74	Bracket Group-Mounting	1
16***93	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	2

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169-4978 Bracket Gp-Mounting

16***78	Bracket Group-Mounting	1
16***97	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	1

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169-4968 Bracket Gp-Mounting

16***68	Bracket Group-Mounting	1
16***88	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7Y***10	Washer-Special; (17x65x6-mm Thk)	2

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169-5311 Bracket Gp-Mounting

12***17	Bolt-Socket Head; (M24x3x70-mm)	14
16***11	Bracket Group-Mounting	1
16***16	Bracket As	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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190-5435 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	14
19***35	Bracket Group-Mounting	1
19***36	Bracket As	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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169-4976 Bracket Gp-Mounting

16***76	Bracket Group-Mounting	1
16***96	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	1

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169-4970 Bracket Gp-Mounting

16***70	Bracket Group-Mounting	1
16***90	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7Y***10	Washer-Special; (17x65x6-mm Thk)	2

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169-3071 Bracket Gp-Mounting

09***48	Nipple, Grease	1
16***71	Bracket Group-Mounting	1
16***91	Bracket As	1
16***92	Pin	1

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169-4967 Bracket Gp-Mounting

16***67	Bracket Group-Mounting	1
16***86	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	10
5P***76	Washer Guard To Support Assembly And Guard Assembly	2

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169-5307 Bracket Gp-Mounting

15***18	Lockwasher	8
16***07	Bracket Group-Mounting	1
16***19	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14

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169-4969 Bracket Gp-Mounting

16***69	Bracket Group-Mounting	1
16***89	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	2

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169-4975 Bracket Gp-Mounting

16***75	Bracket Group-Mounting	1
16***94	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	1

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188-7394 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	18
18***42	Bracket As	1
18***94	Bracket Group-Mounting	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	18

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169-3438 Bracket Gp-Mounting

09***48	Nipple, Grease	2
16***38	Bracket Group-Mounting	1
16***56	Bracket As	1
16***57	Gusset	2

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188-8474 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	18
18***74	Bracket Group-Mounting	1
18***75	Bracket As	1
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	1

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188-7393 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	18
18***41	Bracket As	1
18***93	Bracket Group-Mounting	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	18

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169-5308 Bracket Gp-Mounting

15***18	Lockwasher	8
16***08	Bracket Group-Mounting	1
16***18	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14

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169-4980 Bracket Gp-Mounting

16***80	Bracket Group-Mounting	1
16***98	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***52	Bolt-Plt; (M16 X 2.0 X 30)	2

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169-4981 Bracket Gp-Mounting

16***81	Bracket Group-Mounting	1
16***99	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	1

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190-4854 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	14
19***54	Bracket Group-Mounting	1
19***55	Bracket As	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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169-4971 Bracket Gp-Mounting

12***17	Bolt-Socket Head; (M24x3x70-mm)	14
16***71	Bracket Group-Mounting	1
16***91	Bracket As	1
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	2

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189-0311 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	14
18***11	Bracket Group-Mounting	1
18***12	Bracket As	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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195-0618 Chart-Grapple Mounting

16***71	Bracket Group-Mounting	1
16***38	Bracket Group-Mounting	1
16***99	Mounting Group-Grapple	1
16***08	Mounting Group-Grapple	1

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169-4398 Grapple Gp

09***48	Nipple, Grease	2
16***58	Bushing; (50mm)	2
16***87	Bar As-Push	1
16***90	Bushing; (70mm)	4

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169-4407 Grapple Gp

09***48	Nipple, Grease	3
16***71	Bushing	2
16***05	Pin	1
16***07	Grapple Group	1

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177-3804 Grapple Gp

16***82	Grapple Group	1
16***84	Film Group	1
17***04	Grapple Group	1

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169-4421 Grapple Gp

09***48	Nipple, Grease	3
16***71	Bushing	2
16***05	Pin	1
16***12	Bar As-Push	1

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177-3816 Grapple Gp

16***07	Grapple Group	1
16***09	Film Group	1
17***16	Grapple Group	1

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169-3982 Grapple Gp

09***48	Nipple, Grease	3
16***58	Bushing; (50mm)	2
16***82	Grapple Group	1
16***85	Jaw As-Lower	1

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177-3821 Grapple Gp

16***21	Grapple Group	1
16***23	Film Group	1
17***21	Grapple Group	1

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177-3809 Grapple Gp

16***98	Grapple Group	1
16***00	Film Group	1
17***09	Grapple Group	1

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G112 serial number reference

The PIN/serial plate on a Cat G112 grapple is a stamped metal tag on the frame or mounting bracket near the pivot/linkage attachment point, not on the jaw itself. Read the first three characters as the serial prefix and the digits that follow as the sequential unit number within that prefix run. Because this is a passive mechanical attachment with no engine or electronics, the prefix is the only identity marker - there is no separate engine or ECM serial to cross-check. Confirmed base-G112 ranges (BNZ, BPF) apply to the 320-excavator B-linkage mounting configuration; BRH is the broader family-level PIN group shared with the G115/G125/G140 siblings. Do not confuse with the separate G112B Contractor Grapple line (GCE prefix), a different product for 312-class excavators.

Prefix	Identifies	Notes
BNZ	G112 Mechanical Grapple (base, non-B model)	Mounting-bracket group for a 320 excavator with B-linkage, listed in the parts catalog directly under the G112 attachment line. Passive, curl-actuated work tool - no engine, ECM, or fluid/fault-code serial family.
BPF	G112 Mechanical Grapple (base, non-B model)	Appears in the same bracket-group listing as BNZ, for the same 320-excavator B-linkage mount tied to the G112 attachment line.
BRH	G112 Mechanical Grapple family (base machine PIN group)	Top-level machine PIN grouping for the combined G112/G115/G125/G140 Mechanical Grapple parts catalog. Treat as the base-machine identifier for this shared thin family rather than a G112-only range.
GCE	G112B Contractor Grapple - separate B-suffix product line, not the base G112	Included only for disambiguation. G112B is a distinct Contractor Grapple design for 312-class excavator fitment, from a different family (G107B/G112B/G115B/G120B/G125B/G130B/G145B/G165B/G185B Contractor Grapples), each sibling carrying its own sequential prefix. Do not apply GCE data to a plain G112 unit or vice versa.

Frequently asked questions

Does the G112 have its own engine or hydraulics?

No. The G112 is a passive mechanical grapple with no engine, no ECM, and no hydraulic reservoir or pump of its own. It mounts to a 320-class excavator's stick and linkage (B-linkage configuration) and opens and closes using the host machine's own bucket cylinder and existing hydraulic circuit.

What is the G112's operating weight?

Caterpillar has not published a confirmed operating weight specific to the G112 itself. Weight and dimension figures circulating for the "G112B" Contractors' Grapple belong to a separate, later product and should not be applied to the G112. Confirm the weight of the actual unit, or check with a Cat dealer, before using it for lift-capacity or transport planning.

What replaced the G112, and is the G112B the same tool?

There is no documented direct successor to the G112 within its own Mechanical Grapple family; the larger G115, G125, and G140 are different sizes in the same family, not replacements. The G112B is a separate, later Contractors' Grapple product with its own parts list. It is related in concept and name but is not confirmed as the G112's official replacement.

What G112 owners discuss

What is the G112 and how does it actuate without its own hydraulics?

The G112 is a mechanical (passive) grapple work tool for excavators, part of a wider family of mechanical grapples spanning several linkage sizes. It carries no engine, no hydraulic pump, and no ECM of its own. The jaws open and close off the host excavator's own bucket cylinder through a linkage bar, so there is no extra hose routing or auxiliary circuit hookup needed. With one moving joint set to maintain (the jaw pivot and linkage pins) instead of a cylinder and hoses, operators consistently rate this class of attachment as lower-maintenance than a hydraulic thumb or rotating grapple.

What's the normal wear pattern on the jaw and linkage pins, and when does it call for replacement?

The main wear point is the pin-and-bushing set at the jaw pivot and linkage bar ends. With regular greasing, play stays minimal for years; skipped greasing or dirty, sandy work accelerates galling and bushing wear noticeably faster. Owners generally flag it for service once the jaw visibly rattles or knocks at full open and close, not at the first hint of looseness. Replace pins and bushings as a matched set - running a worn bushing against a new pin, or the reverse, wears the new part out quickly.

How often should the pivot and linkage points be greased?

Consensus among users of pin-and-bushing grapples of this type is to grease every shift, roughly every 8 to 10 hours under normal conditions, and step that up to about every 4 hours in wet, muddy, or sandy ground where contamination gets pulled into the joint faster. Regreasing purges old grease and grit out of the joint rather than just topping it off, which is why frequent light greasing beats infrequent heavy greasing.

Do the tine tips wear out, and can they be replaced in the field?

Yes. The tine tips are the first contact point on the jaws and take the brunt of abrasion, especially against rock, scrap, and demolition debris. On this class of Cat mechanical grapple the tips are a separate, field-serviceable wear part fitted to the jaw structure, so a worn set can be swapped without pulling the whole jaw casting. Watch for uneven tip wear side to side - that usually points to the jaws not closing square, which traces back to pin or bushing slop rather than the tips themselves.

Can a G112 be swapped between different excavator sizes, or is it matched to one machine?

Mechanical grapples in this family are sized to a linkage class - pin diameter and pin-to-pin spacing tied to a given excavator weight range - rather than to one individual machine. Within that linkage class the grapple interchanges across compatible carriers much like a bucket does, and the same jaw and frame can move to an adjacent machine size in the family with a different mounting pin set. Trouble comes from cross-class swapping: a pin diameter or center spacing that's slightly off can look like it fits while leaving the attachment insecure.

Where do these grapples crack, and is it safe to weld a repair yourself?

The recurring failure point mechanics report on jaw-style grapples is cracking around the jaw pivot boss and along the inside radius of the jaw, where stress concentrates under heavy grabbing loads - not the tine tips. Typical field repairs grind the crack fully out, V-groove it, preheat the casting, weld with a low-hydrogen rod, and stress-relieve afterward. Because this is a structural, load-bearing repair on a part that swings close to people and machinery, have your dealer or a qualified fabricator verify the repair procedure and inspect the finished weld before the grapple goes back into service.

What should a buyer check on a used G112 before purchasing?

Grab the jaw and rock it by hand to check pivot and linkage pin play; noticeable movement means worn pins and bushings that need replacing. Inspect the jaw castings and welds closely for hairline cracks, especially around the pivot boss and inside jaw radius, and check any prior weld repairs for proper grinding and prep rather than a quick surface cap. Check tine tip wear and confirm the tips are still within field-replaceable limits, not worn down into the jaw base metal. Confirm the pin diameter and pin-center spacing actually match the intended excavator's linkage class - a grapple that looks right but is out of spec for the machine is a mismatch, not a bargain. Finally, cycle the jaws through a full open-close on the host machine's bucket circuit and confirm smooth, full-range motion with no binding; have your dealer verify fit if there is any doubt about linkage compatibility.

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

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