Caterpillarwork toolgrapple-contractor

Caterpillar G185B

Maintenance schedule, common problems & OEM parts breakdown

The Cat G185B Contractors' Grapple is a hydraulically actuated work tool, not a self-propelled machine — it has no engine, no powertrain, and no undercarriage of its own. It is the largest model in Caterpillar's legacy B-suffix Contractors' Grapple family, a lineup that runs from the G107B up through the G185B across increasing excavator size classes. The G185B weighs approximately 4,808 kg (10,600 lb) and mounts to the Cat 375 excavator via T-linkage or the Cat 385C excavator via HB-linkage, either as a straight pin-on tool or through a pin grabber coupler without modification. Its jaw uses two upper tines against three lower tines, closed and opened by a single hydraulic cylinder circuit fed entirely by the host excavator's hydraulics — there is no independent rotation drive. Wear surfaces (tips, wrappers, and wear plates) are AR400 abrasion-resistant steel, and the tool is built for structural demolition, scrap and material handling, and loading or unloading rock, pipe, and waste debris.

Across the B-suffix family, the core differences from model to model are linkage-specific mounting brackets and proportionally scaled jaw size and wear steel to match each host excavator class, from the smaller G107B on 307-class carriers up to the G185B on 375/385C-class carriers — not a fundamental redesign at each step. Caterpillar has since moved to a current Contractors' Grapple lineup (G108 through G174), but that current range tops out at the G174, sized for roughly 74-ton excavators and lighter than the G185B's capacity class. That leaves no direct factory replacement at the G185B's weight and host-machine bracket, which is why used and rebuilt G185B units, along with their AR400 wear parts and pin/bushing kits, stay in active demand among scrap yards and demolition contractors running 375- and 385C-size carriers.

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 G185B specifications

Weights

Operating weight (grapple only)	approx. 4,808 kg (10,600 lb)
Shipping weight / ground pressure	Not published for this attachment; ground pressure does not apply — the tool has no undercarriage of its own.

Dimensions

Lower jaw / tine width	approx. 1,537 mm (60.5 in)
Wear component thickness	Outer wear plate approx. 30 mm (1.18 in); inner and outer wrapper plates approx. 25 mm (0.98 in) each, faced in AR400 abrasion-resistant steel
Overall envelope (open/closed length, height)	Not documented for this exact model in available literature — not published outside the base weight/width figures above.

Performance

Actuation	A single hydraulic cylinder, fed through the host excavator's bucket/grapple circuit, opens and closes the jaw. There is no separate rotation motor or slewing ring.
Linkage / positioning	Fixed mechanical linkage (T-linkage on the 375, HB-linkage on the 385C) positions the tool through the excavator's normal stick/bucket motion. It does not power-rotate a full 360 degrees the way the rotating sorting/demolition grapple line does.
Travel speed / gradeability	Not applicable. This is a boom-mounted attachment with no engine, transmission, or undercarriage of its own.
Closing force / hydraulic flow-pressure requirement	Not published for this model. The tool draws hydraulic power entirely from the host excavator's bucket/grapple circuit at whatever flow and pressure that circuit supplies.

Service capacities (summary)

Fuel tank, hydraulic reservoir, engine oil, cooling system

Not applicable. The grapple has no onboard fuel tank, hydraulic reservoir, engine, or cooling system; all hydraulic power is supplied by the host excavator.

Compatibility / Mounting

Host excavator / linkage	Built for the Cat 375 excavator with T-linkage, and the Cat 385C excavator with HB-linkage.
Mounting method	Works either as a pin-on attachment or with a pin grabber coupler, with no modification required.
Family	Largest model in Caterpillar's legacy B-suffix contractor's grapple lineup, which also included G107B, G112B, G115B, G120B, G125B, G130B, G145B, and G165B. Built for structural demolition, material handling and sorting, and loading/unloading rock, scrap, pipe, and other debris.
Construction	Tips, wrappers, and wear plates are made from AR400 abrasion-resistant steel. The lower jaw carries a slight curve that eases penetration into debris piles on closing and gives a clean, unobstructed release when dumping.

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

Caterpillar G185B maintenance schedule

Service interval	Tasks
Every 10 h	Grease every pin and bushing point on the jaw and linkage before each shift. Visually inspect the AR400 wear tips, tines, and wrapper plates for cracks or heavy wear. Check the jaw cylinder, hoses, and fittings for hydraulic leaks or weeping seals. Confirm pin-on mounting hardware or pin grabber coupler engagement is fully seated and secure.
Every 50 h	Grease all fittings through a full jaw open-close cycle to purge old grease from the pin bores. Inspect upper and lower jaw pins for movement, scoring, or elongation in the bore. Check welds at the jaw-to-frame and gusset junctions for hairline cracks. Verify coupler lock pins or indicators seat fully if the grapple runs on a pin grabber coupler.
Every 250 h	Measure wear-plate and tine thickness against AR400 wear limits and log the trend. Check pin and bushing clearance at the main jaw pivot for early-stage wear. Torque-check all mounting bolts and wear-shroud fasteners. Inspect the jaw cylinder rod for scoring, pitting, or seal weep.
Every 500 h	Measure pin and bushing wear at every pivot point against factory wear-limit clearances. Inspect jaw cylinder seals for leakage under load and check host hydraulic oil condition on the grapple circuit. Inspect the jaw frame and linkage brackets for stress cracks, especially at weld gussets. Replace wear tines or tips already close to minimum thickness rather than waiting for failure.
Every 1,000 h	Replace pins and bushings that exceed wear-limit clearance at the main pivot and cylinder anchor points. Replace wear plates, wrappers, and tine tips as a matched set once AR400 armor nears base-metal exposure. Cycle-test the jaw cylinder's open-close speed and force against host excavator spec. Have the jaw frame and linkage brackets checked for cracks with a proper structural inspection, not just a visual pass.
Every 2,000 h	Rebuild the main jaw pivot with new pins and bushings as a scheduled milestone, not only where clearance already reads worn. Replace the full AR400 wear package (tips, wrappers, wear plates) together rather than piecemeal. Pull the jaw cylinder for reseal and check rod straightness and bore wear. Send the frame and both linkage brackets (T-linkage and HB-linkage mounting points) for full structural inspection before returning to demolition duty.
Every 4,000 h	Strip the grapple to the bare frame and inspect every pin bore for elongation or out-of-round wear. Re-bush any oversize pin bores rather than fitting an oversize pin as a stopgap. Reassess the cylinder, wear package, and structure together for a rebuild-or-retire decision, since partial fixes rarely pay off on a grapple this worn. Confirm the rebuilt tool still matches its original linkage spec (T-linkage for the 375, HB-linkage for the 385C) before returning it to service.

Servicing the G185B beyond the schedule

Predictive Maintenance & Fluid Analysis

The G185B carries no engine or reservoir of its own — its jaw cylinder draws straight off the host 375 or 385C's hydraulic circuit, so fluid condition tracking means monitoring that host machine's hydraulic oil and filter debris on the grapple circuit. Trend main-pivot pin and bushing clearance at every service interval instead of waiting for a failure. Rising clearance readings or metal showing up in the host's hydraulic filter usually flag cylinder seal wear or pin galling well before a pin actually lets go in the field.

Corrective & Common Repairs

Most G185B repairs are wear-driven rather than sudden breakdowns. Expect to replace AR400 tips, wrappers, and wear plates on the two-tine upper jaw and three-tine lower jaw as scrap and demolition debris thins the armor. Cracked welds at jaw-to-frame gussets and worn pin bores at the main pivot are the next most common fixes. Because the jaw cylinder runs entirely off the 375 or 385C's hydraulic circuit, a sluggish or weeping cylinder is almost always a seal or hose repair, not a host pump problem.

Overhaul & Rebuild Points

A full G185B rebuild means pulling the jaw cylinder for reseal, replacing every main-pivot pin and bushing together instead of one at a time, and swapping the entire AR400 wear package as a matched set once base metal starts showing through the tips and wrappers. Inspect the jaw frame and both linkage brackets — T-linkage for the 375, HB-linkage for the 385C — for stress cracks around welds before putting the tool back into demolition or scrap duty; a freshly rebuilt frame carrying worn pins undermines the whole job.

Seasonal & Environment Servicing

Cold weather thickens grease and lets pin bores run drier between shifts, so shorten the grease interval and switch to a cold-rated grease through winter to keep the main pivot and cylinder anchor pins lubricated. In heavy scrap or concrete-demolition environments, shorten wear-plate and tine inspection intervals, since AR400 armor strips faster there than in general material handling duty. Wash grit out of pin bores before greasing — packed abrasive grit trapped under grease is a leading cause of premature pin and bushing wear on this grapple.

G185B attachments & work tools

Host excavator / linkage fit

The G185B is built for the Cat 375 excavator (T-linkage stick) and the Cat 385C excavator (HB-linkage stick), the two largest hosts in this grapple family. It sits at the top of the G107B-G185B contractor grapple range, which starts on mini/mid-size excavators and scales up to these large-frame machines.

Mounting / coupler system

Mounts either as a direct pin-on to the stick linkage or through a pin-grabber quick coupler, with no change to the grapple needed for either method. Linkage-specific pin sets let the same grapple body be shared across similarly sized excavators by swapping pins to match each host's linkage geometry.

Hydraulic/actuation requirement

This is a mechanically linked, non-rotating grapple: the clamp cylinder works through the excavator's own stick/bucket linkage geometry and runs off the host's standard bucket hydraulic circuit. No dedicated high-flow attachment circuit, extra hose kit, or grapple-rotate hydraulic package is needed to operate it.

Jaw design and wear package

Slightly curved lower jaw with an interlocking upper/lower tine pattern gives good penetration into debris piles and clean release on dump. Tips, wrapper plates, and wear strips are AR400 abrasion-resistant steel, which is the main factory wear-guarding feature protecting the base structure in scrap and demolition service.

Weight / size class

Class weight runs about 4,800 kg (10,600 lb), making it the heaviest model in the G-series contractor grapple lineup, noticeably larger than the mid-size G165B (roughly 4,000 kg / 8,800 lb, V-linkage) one size down. Exact capacity and opening dimensions vary by source and configuration; verify against the current dealer spec sheet for the specific host linkage.

Product family / positioning

Marketed under Cat's Contractors' Grapples line, separate from the rotating Demolition and Sorting Grapples family and the mini-excavator Multi-Purpose Grapples line. Intended for structural demolition and for sorting, loading, and unloading rock, scrap, pipe, and general debris rather than fine or precision material handling.

All G185B assemblies by section

Every catalogued assembly group for the Caterpillar G185B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Service Equipment And Supplies

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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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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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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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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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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287-8239 Plate & Film Gp

28***39

Plate & Film Group

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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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285-3642 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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288-3908 Plate & Film Gp

28***08

Plate & Film Group

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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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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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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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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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275-6074 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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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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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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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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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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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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279-7307 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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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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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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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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275-2400 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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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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282-2576 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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Work Tools

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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275-2404 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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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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285-3515 Grapple Gp

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

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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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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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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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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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282-2577 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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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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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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282-2583 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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281-0356 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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283-5792 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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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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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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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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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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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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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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280-9012 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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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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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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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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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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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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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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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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268-9670 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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298-5681 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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268-9679 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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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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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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275-6076 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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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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275-2407 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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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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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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275-6078 Tine Gp

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

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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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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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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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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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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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G185B serial number reference

The PIN/serial tag for the G185B is a metal plate riveted to the grapple frame or one of the mounting yoke plates, not on an engine or cab since this is a bare hydraulic attachment. Read it as a 3-letter build-series prefix (GCM) followed by a sequential unit number; "GCM1-UP" in the parts book means unit 1 and all later units in that series use the parts shown. Match the full plate number against the arrangement number stamped near it to confirm which mounting configuration (T linkage for 375, or HB linkage for 385C) is fitted before ordering pins or grippers.

Prefix	Identifies	Notes
GCM	Grapple gripper arrangement, both linkage configurations (375 excavator T linkage and 385C excavator HB linkage)	GCM1-UP is the build-series prefix for the G185B contractor grapple itself, not for a host excavator. The two mounting arrangements (T linkage for 375, HB linkage for 385C) share this same prefix; they differ only in the pin group and pivot hardware used to mate to the stick, not in the serial prefix. No later GCM sub-break or successor prefix is documented for this tool.

Frequently asked questions

What engine does the Cat G185B have?

None. The G185B is a hydraulically actuated work tool, not a self-propelled machine, so it has no engine of its own. Its jaw cylinder draws hydraulic power from its host carrier — the Cat 375 excavator through T-linkage or the Cat 385C excavator through HB-linkage.

What is the operating weight of the Cat G185B?

Approximately 4,808 kg (10,600 lb). Exact weight varies slightly by linkage configuration (T-linkage for the 375 versus HB-linkage for the 385C) and by whether it is fitted pin-on or through a pin grabber coupler.

What replaced the Cat G185B?

No direct one-to-one replacement exists. Caterpillar's current Contractors' Grapple lineup runs from the G108 up to the G174, which covers excavators up to roughly the 74-ton class — smaller and lighter than the G185B's 375/385C-class capacity. Used and rebuilt G185B units remain the practical option for that heavier weight bracket.

What G185B owners discuss

How often do the grapple's pins and bushings need greasing, and what wear should I watch for?

Grease every pin joint on the tine pivots and mounting linkage at the start of each shift, roughly every 8-10 hours of active use, with an EP2 lithium-based grease. Skipping a fitting lets the joint run metal-to-metal, which enlarges the bushing bore and lets the pin start knocking. On a used unit, work each jaw by hand and feel for play at the pivots before assuming a fresh grease job will fix it; heavy play means the pin and bushing are due for replacement, not just lubrication. Have your dealer verify pin retention hardware is intact before returning the tool to service.

Does the G185B have a hydraulic rotator like Cat's demolition and sorting grapples?

No. The G185B is a fixed contractors' grapple with no rotating head and no dedicated hydraulic circuit of its own. The jaws open and close by riding on the host excavator's bucket (curl) cylinder through the grapple's mounting linkage, and Cat builds the G185B in different linkage variants matched to specific excavator models (for example a linkage sized for the 375 and a separate HB-linkage version for the 385C). Any rotation of the load comes from swinging the machine's house or repositioning the stick, not from the tool itself.

What wears out fastest on the jaws, and how do owners keep it in service?

The AR400 tips, wrapper plates and wear plates take the abuse from scrap and demolition debris. Tips round off and lose bite first, and wrapper/wear plate thickness thins fastest along the lower jaw's curved loading edge. Most owners track remaining plate thickness against new AR400 stock and either build up worn edges or swap plates before the base jaw structure is exposed; letting a wear plate go through exposes the frame to gouging that costs far more to repair than a plate change.

The tool has no hydraulics of its own. Can excavator hydraulic settings still cause premature wear?

Yes. Because the G185B closes off the host's bucket cylinder rather than its own circuit, a bucket-circuit relief pressure set above factory spec, or pairing the grapple with the wrong linkage variant for that excavator, both overload the pivot pins and accelerate bushing wear. Matching the grapple's linkage configuration to the exact excavator model matters more here than any flow adjustment, since there is no separate valve to tune. Have your dealer verify bucket-circuit relief pressure is at factory spec if pin wear looks faster than expected.

What should I inspect before buying a used G185B?

Check play at every pivot pin by working the jaws by hand or with a bar; clunk or visible movement means the pin and bushing are worn. Compare wear plate, wrapper and tip thickness against new AR400 stock, and look closely at the tip and wrapper mounting welds for cracks or heavy build-up repairs. If the unit is set up on a pin-grabber coupler, check the coupler lock lugs for their own play separate from the grapple's pins. Confirm the grapple's linkage variant matches the excavator it will run on; Cat offered more than one G185B linkage configuration across the 375/385C-class range, and a mismatch shows up as poor jaw alignment or uneven closing. Have your dealer verify any weld repairs and pin retention before putting a used unit back to work.

Pin-on or pin-grabber coupler: does the mounting style change wear or reliability?

The G185B runs either way without modification. Pin-on mounting removes one wear interface entirely since the grapple bolts straight to the stick. Running it on a pin-grabber coupler adds flexibility for fast tool changes but adds a second set of wear points, the coupler's lock pins and lugs, that need their own daily play check separate from the grapple's own pins. Contractors who swap tools often accept the added coupler wear point for the time saved; those running one tool long-term more often prefer direct pin-on. Have your dealer verify coupler lock engagement each shift if running on a pin-grabber mount.

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

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