Caterpillarwork toolgrapple-contractor

Caterpillar G107B

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar G107B is a fixed-jaw contractors' grapple, a passive hydraulic work tool with no engine, ECM, transmission, or undercarriage of its own. It mounts pin-on or through a pin grabber coupler to Cat 307-linkage mini and midi excavators, and its jaw opens and closes off a single double-acting circuit drawn from the host machine's auxiliary hydraulics. Operating weight runs about 360 kg (794 lb), with a fixed jaw opening near 1765 mm (69.5 in) and a jaw width of about 737 mm (29 in). No confirmed production start or end date and no earlier non-B "G107" model turned up in available records, so it is treated as a single current model rather than part of a generation split. It sits at the small end of Cat's contractor-grapple lineup, which scales upward through G112B, G115B, G120B, G125B, G130B, G145B, G165B, and G185B, each size keyed to a specific excavator class and carrying its own serial prefix.

Because the G107B has no engine or ECM to revise, there is no generational split in this model line the way there is on powered machines; the design has stayed a fixed-jaw, non-rotating grapple built around AR400 wear-steel jaws, wrapper plates, and tips protecting a common casting. That wear-part construction is exactly why the model holds steady demand in the used and parts market: pivot pins, bushings, wear plates, wrapper plates, tips, and clamp-cylinder seals are consumable by design and see regular replacement over the tool's working life, while the core jaw structure and mounting geometry tend to outlast several rounds of wear parts. Paired with the widely deployed 307-linkage excavator fleet it serves, that keeps a steady aftermarket pull for both used G107B units and their wear 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 G107B specifications

Engine

Engine	Not applicable. The G107B is a passive contractors' grapple with no engine or ECM of its own. It clamps using the host excavator's hydraulic circuit.
Emissions tier	Not applicable, no onboard engine.

Weights

Operating weight	360 kg (794 lb)
Ground pressure	Not published for this attachment; not a self-supporting undercarriage machine.

Dimensions

Maximum jaw opening	1765 mm (69.5 in)
Fixed jaw width	737 mm (29 in)
Jaw tine configuration	Curved upper jaw paired with a wider fixed lower jaw for scrap and demolition penetration
Wear plate thickness	12 mm (0.47 in)
Wrapper thickness (inner and outer)	8 mm (0.31 in) each
Host linkage class	Built for the 307-linkage mounting family used across Cat mini/midi excavators in that size class; mounts pin-on or with a pin grabber coupler with no modification

Performance

Travel speed	Not applicable, work tool has no travel drive of its own.
Clamping/gripping performance	Not published in dealer or factory literature for this model; clamp force is generated through the host excavator's auxiliary hydraulic circuit rather than a rating specific to the grapple.
Gradeability	Not applicable to this attachment type.

Service capacities (summary)

Fuel tank	Not applicable, no engine on the attachment.
Hydraulic system	No dedicated reservoir; the grapple runs off the host machine's hydraulic system rather than carrying its own fluid capacity.
Engine oil	Not applicable.
Cooling system	Not applicable.

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

G107B fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter)	Not applicable — the G107B 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 (and rotator, if fitted) draws off the host excavator's own hydraulic circuit and tank; no dedicated reservoir or fill capacity for the tool itself	Follow the host carrier's own OMM hydraulic oil recommendation and viscosity-by-climate chart (for a Cat 307-linkage 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; the exact branded product and any cold-climate alternate are not broken out in a G107B-specific chart 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 G107B maintenance schedule

Service interval	Tasks
Every 10 h	Grease each jaw pivot pin and bushing through its fitting until fresh grease purges at the joint Visually inspect wear plates, wrapper plates, and tips for cracking, gouging, or thinning toward base metal Check the clamp cylinder rod and gland for oil weeping or visible scoring Confirm pin-on mounting pins or pin-grabber coupler lock pins are fully seated and engaged before starting work
Every 50 h	Grease pivot points if daily service was skipped in light-duty use, and check each jaw for lateral play by hand with the circuit isolated Compare wear-plate and wrapper stock against original thickness and flag any point close to base-metal exposure Inspect the auxiliary hydraulic hoses and fittings running to the grapple for chafing, kinks, or seepage Check mounting pin and coupler retention hardware for looseness and retorque as needed
Every 250 h	Measure pivot pin and bushing clearance against service tolerance and replace any bushing showing bell-mouth wear Inspect wrapper welds and the jaw casting around each pivot for impact cracking Cycle the jaws through full open and close and watch for hesitation or drift that points to cylinder seal wear Clean grease fittings and replace any damaged or clogged zerks
Every 500 h	Pull the clamp cylinder gland, inspect the rod for scoring or pitting, and reseal if weeping is present Inspect pin bores on the coupler interface and pin-on ears for elongation or oval wear Replace wear plates, wrapper plates, or tips that have reached minimum remaining stock Check jaw alignment for flush closure between the upper and lower jaw
Every 1,000 h	Inspect and replace pivot pins and bushings across every jaw pivot as a full set rather than point-by-point Inspect all structural welds on the jaw and wrapper mounts and repair per Cat weld procedure where cracked Rebuild or reseal the clamp cylinder if it was not already serviced at 500 h Check coupler interface geometry against factory tolerance and correct any mismatch before returning to service
Every 2,000 h	Renew the full pin-and-bushing set at every pivot to reset wear clearance to new-build spec Correct jaw alignment or straighten the jaw if closure is out of flush Renew wear plates, wrapper plates, and tips as a full set even where not yet at base metal, to reset the wear baseline Inspect the jaw casting and high-cycle mounting points for fatigue cracking

Servicing the G107B beyond the schedule

Predictive Maintenance & Fluid Analysis

There is no engine or hydraulic reservoir on the G107B itself to sample, so predictive care centers on wear trending. Track pivot pin and bushing clearance at each service interval and log the trend rather than waiting for a knock to appear. Monitor wear-plate, wrapper, and tip thickness against original stock so replacement happens before the base jaw casting is exposed. Watch clamp-cylinder cycle behavior for hesitation or drift, an early tell for rod-seal wear before a visible weep develops.

Corrective & Common Repairs

The recurring fixes on a G107B are bushing replacement at the jaw pivots once clearance builds past tolerance, wear-plate and wrapper renewal once AR400 stock thins near the base casting, and clamp-cylinder reseal when the rod gland starts weeping. A scored or pitted rod usually calls for rod replacement rather than a seal-only fix. Pin bore or pin-on ear elongation at the coupler interface is the other common wear point, showing up as mounting slop rather than a jaw fault.

Overhaul & Rebuild Points

A full rebuild on the G107B means replacing pins and bushings as a complete set across every pivot to restore original clearance, not chasing individual points as they fail. Jaw realignment corrects closure that has gone out of flush from accumulated pivot wear or impact loading. Structural welds on the wrapper mounts and jaw casting need inspection for fatigue cracking at these high-cycle overhaul intervals, with repair done to Cat weld procedure rather than field patching.

Seasonal & Environment Servicing

Grease selection matters more than schedule changes across climates: NLGI 2 multipurpose grease covers general service, with a cold-weather-rated alternate needed where temperatures drop enough to stiffen standard grease at the pivot fittings. In wet or abrasive demolition and scrap environments, grease purges out of the pivots faster and pins are more exposed to corrosion, so shortening the greasing interval and rinsing debris packed around the pivots and wear plates protects against accelerated pin and bushing wear.

G107B attachments & work tools

Host machine fit / size class

The G107B is built for Cat 307-linkage machines, the small end of the Cat mini/compact excavator range. It sits in a contractor-grapple lineup (G112B through G185B) where each size keys to a specific excavator class, stepping up through 312, 315, 320 and 325-class carriers, so the tools are not interchangeable across sizes.

Mounting / coupler system

Mounts as a two-pin, bucket-style attachment pinned directly to the stick and linkage. It also works with a pin-grabber coupler on the host excavator with no modification to the grapple itself, so a machine already running a pin-grabber quick coupler can pick it up without a dedicated adapter.

Hydraulic requirement

This is a fixed-jaw, non-rotating grapple; jaw open/close is driven by a hydraulic clamp cylinder fed from the excavator's auxiliary (thumb-type) hydraulic circuit. The host machine needs an auxiliary line and in-cab clamp control already fitted or added. The grapple adds no rotation function on its own; 360-degree rotation is a separate rotating-grapple product, not this family.

Jaw and tine configuration

Fixed jaw opening on the G107B is about 740mm (29 in) wide. The jaw uses a two-tine-over-three-tine arrangement, and the lower jaw has a slight curve to aid penetration into loose scrap or debris and give a clean release on dump.

Wear protection / guarding

Tips, wrapper plates and wear plates on the jaws are AR400 abrasion-resistant steel to protect the base structure in scrap and demolition work. On the G107B, wear-plate stock runs roughly 12mm (0.47 in) and wrapper stock roughly 8mm (0.31 in); heavier siblings higher in the family use thicker stock for larger, more abrasive loads.

Weight class

The G107B weighs about 360 kg (794 lb), sized to the lift and hydraulic capacity of a 307-class carrier. Family siblings scale up in tine width, jaw opening and weight as the excavator class increases toward the largest machines at the top of the range.

Work-tool family / typical use

Part of Cat's contractor/demolition-sorting grapple family, meant for structural demolition, sorting, and loading or unloading rock, scrap, pipe and waste debris. It is a material-handling clamp, not a log or orange-peel grapple, and is not rated for lifting personnel or overhead handling.

All G107B assemblies by section

Every catalogued assembly group for the Caterpillar G107B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Service Equipment And Supplies

286-5619 Plate & Film Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
28***19	Plate & Film Group	1

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280-1490 Plate & Film Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
28***90	Plate & Film Group	1

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285-8093 Plate & Film Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
28***93	Plate & Film Group	1

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288-3908 Plate & Film Gp

28***08

Plate & Film Group

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287-8239 Plate & Film Gp

28***39

Plate & Film Group

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287-0487 Plate & Film Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
28***87	Plate & Film Group	1

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285-3642 Plate & Film Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
28***42	Plate & Film Group	1

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287-5798 Plate & Film Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
28***98	Plate & Film Group	1

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284-7987 Plate & Film Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
28***87	Plate & Film Group	1

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Work Tool Arrangement

321-6032 Grapple Ar-Demolition

28***04	Pin Group-Grapple; -G130b, D-Linkage	1
32***58	Grapple Group	1
32***32	Grapple Ar-Demolition	1

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285-1264 Grapple Ar-Mechanical -G107b

13***34	Plate-Identification; (Work Tool)	1
28***64	Grapple Ar-Mechanical; -G107b	1
28***15	Grapple Group	1
28***50	Pin Group-Grapple; -G107b	1

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283-7308 Grapple Ar-Mechanical -G185b

13***34	Plate-Identification; (Work Tool)	1
28***08	Grapple Ar-Mechanical; -G185b	1
28***10	Pin Group-Grapple; -G185b	1
28***86	Grapple Group; -G185b	1

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283-7307 Grapple Ar-Mechanical -G185b

13***34	Plate-Identification; (Work Tool)	1
28***07	Grapple Ar-Mechanical; -G185b	1
28***09	Pin Group-Grapple; -G185b	1
28***86	Grapple Group; -G185b	1

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275-2402 Grapple Ar-Mechanical -G130b

13***34	Plate-Identification; (Work Tool)	1
27***02	Grapple Ar-Mechanical; -G130b	1
27***04	Grapple Group; -G130b	1
28***11	Pin Group-Grapple; -G130b, C-Linkage	1

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282-2576 Grapple Ar-Mechanical

13***34	Plate-Identification; (Work Tool)	1
28***76	Grapple Ar-Mechanical	1
28***77	Grapple Group; -G165b	1
28***83	Pin Group-Grapple; -G165b	1

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275-6072 Grapple Ar-Mechanical -G125b

13***34	Plate-Identification; (Work Tool)	1
27***72	Grapple Ar-Mechanical; -G125b	1
27***75	Grapple Group; -G125b	1
28***55	Pin Group-Grapple; -G120b, G125b, C-Linkage	1

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279-7361 Grapple Ar-Mechanical -G145b

13***34	Plate-Identification; (Work Tool)	1
27***61	Grapple Ar-Mechanical; -G145b	1
27***77	Grapple Group; -G145b	1
28***49	Pin Group-Grapple; -G145b, F / T-Linkage	1

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282-2575 Grapple Ar-Mechanical -G165b

13***34	Plate-Identification; (Work Tool)	1
28***75	Grapple Ar-Mechanical; -G165b	1
28***77	Grapple Group; -G165b	1
28***82	Pin Group-Grapple; -G165b, V-Linkage	1

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279-7306 Grapple Ar-Mechanical -G120b

13***34	Plate-Identification; (Work Tool)	1
27***06	Grapple Ar-Mechanical; -G120b	1
27***22	Grapple Group; -G120b	1
28***56	Pin Group-Grapple; -G120b, G125b, Cb-Linkage	1

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279-7362 Grapple Ar-Mechanical -G145b

13***34	Plate-Identification; (Work Tool)	1
27***62	Grapple Ar-Mechanical; -G145b	1
27***77	Grapple Group; -G145b	1
28***51	Pin Group-Grapple; -G145b	1

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275-2401 Grapple Ar-Mechanical -G130b

13***34	Plate-Identification; (Work Tool)	0
27***01	Grapple Ar-Mechanical; -G130b	1
27***04	Grapple Group; -G130b	1
28***12	Pin Group-Grapple; -G130b	1

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275-2400 Grapple Ar-Mechanical -G130b

13***34	Plate-Identification; (Work Tool)	1
27***00	Grapple Ar-Mechanical; -G130b	1
27***04	Grapple Group; -G130b	1
28***04	Pin Group-Grapple; -G130b, D-Linkage	1

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279-7307 Grapple Ar-Mechanical -G120b

13***34	Plate-Identification; (Work Tool)	1
27***07	Grapple Ar-Mechanical; -G120b	1
27***22	Grapple Group; -G120b	1
28***57	Pin Group-Grapple; -G120b, G125b, B-Linkage	1

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275-2403 Grapple Ar-Mechanical -G130b

13***34	Plate-Identification; (Work Tool)	1
27***03	Grapple Ar-Mechanical; -G130b	1
27***04	Grapple Group; -G130b	1
28***13	Pin Group-Grapple; -G130b, Cb-Linkage	1

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275-6074 Grapple Ar-Mechanical -G125b

13***34	Plate-Identification; (Work Tool)	1
27***74	Grapple Ar-Mechanical; -G125b	1
27***75	Grapple Group; -G125b	1
28***57	Pin Group-Grapple; -G120b, G125b, B-Linkage	1

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279-7305 Grapple Ar-Mechanical -G120b

13***34	Plate-Identification; (Work Tool)	1
27***05	Grapple Ar-Mechanical; -G120b	1
27***22	Grapple Group; -G120b	1
28***55	Pin Group-Grapple; -G120b, G125b, C-Linkage	1

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282-8316 Grapple Ar-Mechanical -G115b

13***34	Plate-Identification; (Work Tool)	1
28***16	Grapple Ar-Mechanical; -G115b	1
28***17	Grapple Group; -G115b	1
28***21	Pin Group-Grapple; -G115b	1

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283-5790 Grapple Ar-Mechanical -G112b

13***34	Plate-Identification; (Work Tool)	1
28***90	Grapple Ar-Mechanical; -G112b	1
28***91	Grapple Group; -G112b	1
28***92	Pin Group-Grapple; -G112b, 312-Linkage	1

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275-6073 Grapple Ar-Mechanical -G125b

13***34	Plate-Identification; (Work Tool)	1
27***73	Grapple Ar-Mechanical; -G125b	1
27***75	Grapple Group; -G125b	1
28***56	Pin Group-Grapple; -G120b, G125b, Cb-Linkage	1

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Work Tools

284-5386 Grapple Gp -G185b

08***97	Washer; (13x50x6-mm Thk)	1
09***30	Seal-Lip Type	4
09***74	Bearing-Sleeve	1
09***48	Nipple, Grease	2

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282-8317 Grapple Gp -G115b

09***48	Nipple, Grease	4
12***90	Bearing-Sleeve	2
19***63	Spacer; (16.5x22.2x13-mm Thk)	1
21***83	Pin As	1

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282-2577 Grapple Gp -G165b

09***48	Nipple, Grease	4
11***81	Bearing-Sleeve	2
12***90	Bearing-Sleeve	2
19***63	Spacer; (16.5x22.2x13-mm Thk)	1

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283-5791 Grapple Gp -G112b

09***48	Nipple, Grease	6
14***38	Bearing-Sleeve	4
16***52	Bearing; (180.45-mm Id)	2
19***63	Spacer; (16.5x22.2x13-mm Thk)	1

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279-7322 Grapple Gp -G120b

09***48	Nipple, Grease	4
10***29	Bearing-Sleeve	2
12***90	Bearing-Sleeve	2
19***63	Spacer; (16.5x22.2x13-mm Thk)	1

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275-6075 Grapple Gp -G125b

09***48	Nipple, Grease	4
10***29	Bearing-Sleeve	2
19***52	Bracket As-Mounting	1
19***60	Pin As	1

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275-2404 Grapple Gp -G130b

09***48	Nipple, Grease	4
19***52	Bracket As-Mounting	1
19***60	Pin As	1
19***63	Spacer; (16.5x22.2x13-mm Thk)	1

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279-7377 Grapple Gp -G145b

09***48	Nipple, Grease	6
14***38	Bearing-Sleeve	4
18***58	Bearing; (190.31-mm Od)	2
19***63	Spacer; (16.5x22.2x13-mm Thk)	1

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321-4358 Grapple Gp

27***09	Bushing	2
27***14	Pin	1
27***17	Bushing	2
28***52	Collar	2

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285-3515 Grapple Gp

27***08	Bushing	2
27***13	Pin	1
27***16	Bearing	2
28***52	Collar	2

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285-3550 Pin Gp-Grapple -G107b

26***28	Plate As-Wear	3
26***29	Plate-Wear	4
26***30	Plate-Wear	4
26***69	Plate As-Wear	2

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283-7310 Pin Gp-Grapple -G185b

26***19	Plate As-Wear	2
26***20	Plate As-Wear	3
26***23	Plate-Wear	4
26***24	Plate-Wear	4

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280-9012 Pin Gp-Grapple -G130b

27***16	Bearing	2
27***79	Bearing	2
27***81	Pin	1
28***12	Pin Group-Grapple; -G130b	1

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283-5792 Pin Gp-Grapple -G112b, 312-Linkage

19***80	Plate	1
19***84	Pin As	1
28***59	Collar	2
28***92	Pin Group-Grapple; -G112b, 312-Linkage	1

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281-0356 Pin Gp-Grapple -G120b, G125b, Cb-Linkage

27***82	Bushing	2
27***83	Collar	2
27***84	Pin	1
27***85	Bushing	2

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281-2051 Pin Gp-Grapple -G145b

19***79	Plate	1
21***88	Pin As	1
28***51	Pin Group-Grapple; -G145b	1
28***59	Collar	2

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283-7309 Pin Gp-Grapple -G185b

04***12	Pin	2
10***34	Pin	1
28***09	Pin Group-Grapple; -G185b	1
28***51	Bearing	2

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281-2049 Pin Gp-Grapple -G145b, F / T-Linkage

19***79	Plate	1
28***49	Pin Group-Grapple; -G145b, F / T-Linkage	1
28***53	Pin As	1
28***58	Bearing	2

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280-9004 Pin Gp-Grapple -G130b, D-Linkage

09***49	Washer; (22x60x6-mm Thk)	1
25***58	Pin As	1
27***10	Bushing	2
27***15	Pin	1

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282-2582 Pin Gp-Grapple -G165b, V-Linkage

10***78	Pin	1
28***82	Pin Group-Grapple; -G165b, V-Linkage	1
28***22	Bearing	2
28***24	Pin	1

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282-8521 Pin Gp-Grapple -G115b

19***79	Plate	1
28***59	Collar	2
28***21	Pin Group-Grapple; -G115b	1
28***21	Bearing	2

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280-9013 Pin Gp-Grapple -G130b, Cb-Linkage

09***49	Washer; (22x60x6-mm Thk)	1
23***31	Pin As	1
27***08	Bushing	2
27***82	Pin	1

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282-2583 Pin Gp-Grapple -G165b

08***23	Pin Bkt To Stk Link To Bkt.	1
09***76	Nut; (M14x2-Thd)	2
24***74	Bolt; (M14x2x160-mm)	1
28***83	Pin Group-Grapple; -G165b	1

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281-0357 Pin Gp-Grapple -G120b, G125b, B-Linkage

20***71	Washer; (26x90x8-mm Thk)	1
27***83	Collar	2
27***86	Bushing	2
27***87	Pin	1

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281-0355 Pin Gp-Grapple -G120b, G125b, C-Linkage

27***80	Bushing	2
27***81	Pin	1
27***84	Bushing	2
28***55	Pin Group-Grapple; -G120b, G125b, C-Linkage	1

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280-9011 Pin Gp-Grapple -G130b, C-Linkage

09***49	Washer; (22x60x6-mm Thk)	1
23***31	Pin As	1
27***11	Bushing	2
27***13	Pin	1

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298-5689 Plate Gp-Wear

28***32	Plate-Wear	2
28***33	Plate-Wear	2
28***37	Bar, Bolt,Hex Flange Head Cap M8 X 1.25 X 125mm; Special, Bolt,Hex Flange Head Cap M8 X 1.25 X 125mm	2
29***89	Plate Group-Wear	1

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288-5713 Plate Gp-Wear

28***13	Plate Group-Wear	1
29***84	Plate As-Wear	4
29***85	Plate-Wear	4
29***86	Plate-Wear	4

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268-9625 Plate Gp-Wear

26***25	Plate Group-Wear	1
26***74	Plate As-Wear	4
26***76	Plate As-Wear	1
26***77	Plate-Wear	4

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268-9679 Plate Gp-Wear

26***79	Plate Group-Wear	1
29***75	Plate As-Wear	4
29***78	Plate As-Wear	1
29***79	Plate As-Wear	4

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268-9617 Plate Gp-Wear

26***17	Plate Group-Wear	1
26***34	Plate As-Wear	2
26***65	Plate As-Wear	3
26***66	Plate-Wear	4

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268-9631 Plate Gp-Wear

26***31	Plate Group-Wear	1
29***66	Plate As-Wear	4
29***69	Plate As-Wear	1
29***70	Plate-Wear	4

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298-5681 Plate Gp-Wear

27***37	Keeper	1
27***78	Keeper	1
27***00	Plate-Wear	2
27***01	Plate-Wear	2

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268-9670 Plate Gp-Wear

26***70	Plate Group-Wear	1
28***14	Plate-Wear	4
28***15	Plate-Wear	4
28***16	Plate As-Wear	3

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298-5672 Plate Gp-Wear

29***72	Plate Group-Wear	1
29***92	Plate As-Wear	5
29***93	Plate-Wear	2
29***94	Plate-Wear	3

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275-6076 Tine As -Upper

27***76	Tine As; -Upper	1
28***33	Plate-Wear	3
28***41	Plate-Wear	3

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285-1266 Tine As

10***29	Bearing-Sleeve	2
27***07	Tine Group; -Lower	1
28***66	Tine As	1

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285-1265 Tine As

27***37	Keeper	1
27***74	Plate-Wear	2
27***75	Plate-Wear	2
27***76	Bar	1

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275-2407 Tine Gp -Lower

27***07	Tine Group; -Lower	1
27***01	Plate-Wear	2
27***07	Plate-Wear	1
27***08	Plate-Wear	1

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321-4361 Tine Gp -Heavy Duty

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
29***57	Film-Identification; (Cat G120b)	1

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283-5856 Tine Gp

10***29	Bearing-Sleeve	2
27***06	Tine Group; -Lower	1
28***56	Tine Group	1
28***15	Plate-Wear	4

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321-4360 Tine Gp

15***44	Film-Warning; (Flying Debris)	1
15***35	Film-Warning; (Crush Hazard, Stay Back)	2
15***36	Film-Warning; (Read Operation Manual)	1
29***59	Film-Identification; (Cat G130b)	1

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285-3538 Tine Gp

27***05	Tine Group	1
28***38	Tine Group	1
28***14	Plate-Wear	4
28***16	Plate As-Wear	2

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283-5793 Tine Gp

21***21	Keeper	2
28***93	Tine Group	1
28***19	Plate-Wear	2
28***59	Plate-Wear	1

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275-2405 Tine Gp

27***05	Tine Group	1
27***75	Plate-Wear	1
27***76	Bar	2
27***82	Plate-Wear	1

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275-6078 Tine Gp

27***78	Tine Group	1
28***18	Plate-Wear	2
28***19	Plate-Wear	2

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275-6077 Tine Gp

27***77	Tine Group	1
27***10	Plate-Wear	2
27***11	Plate-Wear	2
28***45	Keeper	1

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275-2406 Tine Gp -Lower

10***29	Bearing-Sleeve	2
27***06	Tine Group; -Lower	1
27***78	Tine Group	1

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279-7378 Tine Gp

25***07	Bearing-Sleeve	2
27***78	Tine Group	1
28***56	Tine Group	1

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283-5794 Tine Gp

22***14	Bearing-Sleeve	2
28***94	Tine Group	1
28***66	Tine As	1

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G107B serial number reference

The ID plate is riveted or stamped on the grapple frame near the pivot/mounting ears, close to where the tool pins to the stick or pin grabber coupler. Read the first 3 characters as the prefix (identifies this exact grapple model/size within the Contractor Grapple line) and the following digits as the sequential unit number.

Prefix	Identifies	Notes
GCD	G107B Contractor Grapple, pin-on or pin grabber coupler mount, for 307-linkage excavators	GCD00001-UP. Covers the G107B specifically within the shared G107B/G112B/G115B/G120B/G125B/G130B/G145B/G165B/G185B Contractor Grapple family; each size carries its own distinct prefix (G120B uses GCG, G145B uses GCJ, etc). No engine or ECM; passive hydraulic-jaw work tool. No plant/region or year data found tied to this prefix.

Frequently asked questions

What engine does the Caterpillar G107B have?

None. The G107B is a passive contractors' grapple with no engine, ECM, or onboard power source. It clamps and releases using hydraulic flow supplied by the host excavator's auxiliary circuit, so its "powertrain" is whichever Cat 307-linkage excavator it is mounted on.

What is the operating weight of the Caterpillar G107B?

About 360 kg (794 lb), sized to match the lift and hydraulic capacity of a 307-class mini or midi excavator carrier.

What replaced the G107B, or is there a larger version?

No predecessor or successor model has been documented; the G107B is treated as the current model at this size. It sits at the small end of Cat's contractor-grapple lineup, which scales up through G112B, G115B, G120B, G125B, G130B, G145B, G165B, and G185B for progressively larger excavator classes rather than replacing the G107B.

What G107B owners discuss

What wears out first on a G107B, and how do operators catch it early?

The jaw pivot pins and their bushings take the abuse. Repeated open/close cycles under load bell-mouth the bushing bore and score the pin, and once clearance builds in you get a knock at the pivot and a jaw that no longer closes flush against its mate. Operators check this by working the jaws slow and watching for lateral play or a visible gap line, and by rocking the jaw by hand with the engine off. Caught early it's a bushing swap; ignored it turns into an elongated pin bore in the casting itself. Have your dealer verify pin and bore wear against service tolerance before it's run further.

How often does a fixed-jaw grapple like this need greasing, and what happens if it gets skipped?

Community practice on pin-on demolition/sort grapples is to grease every pivot point at or near daily use, more often in dusty or wet debris work where grease washes or grinds out fast. Skipping intervals is the number-one cause of premature pin and bushing failure on these tools — dry pivots gall, then wallow out, and by the time it's noticed the fix is a pin-and-bushing kit rather than a grease gun.

The wear tips and wrapper plates are chewed up after heavy scrap work — is that expected?

Yes. The tips, wrappers and wear plates are AR400 wear steel and are treated as a sacrificial layer, not structural steel — their whole job is to erode instead of the jaw casting underneath. Rate of wear depends heavily on material handled; abrasive concrete rubble and rebar chew tips faster than clean pipe or wood debris. The community rule of thumb is to replace or build up wear plates before they thin enough to expose the base metal, since once the base metal starts wearing the repair moves from a bolt-on/weld-on wear part to a structural weld repair.

Cylinder is weeping oil around the rod — how big a deal is that?

A rod seal weep on a grapple open/close cylinder is a common, fixable wear item, not usually a sign the cylinder itself is shot. Typical causes discussed among owners: worn rod seal from cycle count, a scored or pitted rod from debris contact, or contaminated hydraulic fluid attacking the seal. Most shops pull the gland, inspect the rod surface for scoring, and replace the seal kit; a scored rod usually means the rod itself needs replacing or the cylinder swapped rather than just reseal. Have your dealer verify rod condition and cylinder alignment before returning it to service.

Will the G107B bolt straight onto a pin grabber coupler, or does jaw clearance become an issue?

Cat markets the G107B to run either pin-on or through a pin grabber coupler without modification, and that holds true for factory Cat couplers matched to the 307-linkage. Where owners report trouble is mixing brands — a coupler body that sits taller or wider than the OEM unit can contact the grapple's upper jaw or wrapper before the jaw reaches full open, especially at full close-to-open swing. Before running an aftermarket coupler, cycle the jaws through full travel on the ground and confirm nothing contacts the coupler housing.

How much hydraulic flow does the host excavator need to run this grapple properly?

The G107B is a fixed-jaw grapple, not a rotating one, so it only needs a single double-acting auxiliary circuit to open and close the jaws — it doesn't need the second aux circuit that rotating grapples require for continuous rotation. Any 307-linkage mini/midi excavator with a working double-acting aux line supplies enough flow; running it on a machine with weak or leaking aux flow shows up as slow, hesitant jaw closing rather than any damage risk.

What should you check before buying a used G107B?

Cycle the jaws through full open and full close and watch for hesitation, jerkiness, or drift when held mid-stroke — any of those points to worn pivot bushings, a misaligned pin, or a tired cylinder seal. With the unit off the machine, rock each jaw by hand at the pivots to feel for play; excessive play means the pin and bushing are due. Check the tips, wrappers, and wear plates for remaining wear-steel thickness and look closely at the wrapper welds for cracking from years of demolition impact. Inspect the cylinder rod for scoring and the glands for weeping. Finally, check the coupler pin bores or pin-on ears for elongation or oval wear, since that's where mounting slop shows up first. Have your dealer verify pin, bushing, and structural weld condition against spec before putting a used unit into daily service.

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

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