Caterpillarwork toolgrapple-orange peel

Caterpillar GSH15

Maintenance schedule, common problems & OEM parts breakdown

The Cat GSH15 is a hydraulic orange-peel grapple, a work tool rather than a self-propelled machine. It belongs to Caterpillar's GSH9/GSH15/GSH20/GSH22 orange-peel grapple line, sized roughly to carrier weight class, with the GSH15 built for excavators and material handlers in the 15-tonne class. Hydraulic cylinders close the tines around the load and a hydraulic rotator turns the head through continuous rotation, letting the operator orient and dump material without repositioning the carrier. It has no engine, transmission, or fuel system of its own; all power comes from the host machine's own hydraulic circuit. Typical work is scrap handling, demolition cleanup, and log or bulk-material sorting. It mounts on Cat crawler excavators from the 312C through 330D range and on Cat M-series material handlers such as the M315D, M316D, M318D, and M322D, plus MH-badged carriers like the 322D MH, 325D MH, and 330D MH, each needing its own hydraulic connecting-line kit for the fit.

Caterpillar later replaced this line with a B-series grapple (GSH9B/GSH15B/GSH20B) that carried a revised rotator design; specs and rotator options published for the B-series apply to that line only, not to the original GSH15. Because a grapple's daily work is cyclic clamping and rotating of loads, its wear items - tine tips, cylinder seals, pivot pins and bushings, and the rotator bearing - see far more duty cycles than a comparable machine's structural pins. That keeps the used and parts market for the GSH15 active: buyers check tine and pin wear closely, and rebuilt cylinders or rotator assemblies remain common repair items long after the tool itself left the new-equipment line.

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 GSH15 specifications

Weights

Operating weight (tool only, excludes crosshead mounting bracket)	Not published in accessible factory literature for this base (pre-successor) serial range. Confirm the exact figure for your unit with your Cat dealer using its serial prefix.
Shipping weight	Not documented separately from operating weight in available sources.

Dimensions

Overall height, tines closed and open	Specific dimension figures for this configuration are not published in accessible spec sheets; height varies with tine count (four- or five-tine head) and capacity option.
Tine/jaw maximum opening width	Not documented for this specific model/serial range in available literature; opening width varies by tine configuration and capacity class.
Tine tip capacity (rated, tines closed)	Sits in the smaller/mid capacity bracket of the Cat orange peel grapple line. Exact rated volume for this base configuration is not published online; confirm with your dealer.

Performance

Compatible carrier/excavator class	Mounts on a broad mid-size class of Cat excavators and material handlers, including the 312C, 315C, 318C, 319C, 320C/320D, 322C/322D, 323D, 324D, 325D, 328D and 330D, plus the M315D, M316D, M318D, M319D, M322D, M325D and M330D material handlers.
Rotation	Fitted with its own hydraulic geared rotator giving continuous 360-degree rotation, powered off the host machine's hydraulics. Rotation speed/torque figures specific to this configuration are not published in available documentation.
Closing force / duty cycle	Tine closing is hydraulic-cylinder actuated and sized to the grapple's capacity class. Mechanical stops on each tine protect the cylinders from over-extension and over-closing as tips wear. A specific closing-force rating for this model/serial range is not published in available sources.

Service capacities (summary)

Fuel tank / engine oil / coolant	None. This tool has no engine of its own, so it carries no fuel tank, engine oil, or cooling system.
Hydraulic flow/pressure requirement (from host machine)	Runs on the host excavator's auxiliary hydraulic circuit for tine open/close, with a separate circuit feeding the rotator. Exact flow and pressure figures for this specific serial range are not published in available literature; confirm the requirement with your Cat dealer or the host machine's work-tool hydraulic kit specification.
Grease points	Grapple pins, crosshead bracket, and rotator bearing/gear take periodic grease service. No scheduled fluid-change service applies since the tool has no engine, transmission, or cooling system.

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

GSH15 fluids & capacities

System	Capacity	Recommended fluid
Grapple jaw pivot pins and bushings	No fixed fill volume published - grease each fitting until fresh grease purges at the pin/bushing joint. Grease daily (about every 10 service hours) under normal duty; shorten the interval in wet, dusty, or abrasive scrap-handling conditions.	Cat MPGM (multipurpose grease with 5% molybdenum) - NLGI 2 extreme-pressure/moly grease for high-shock pin-and-bushing service. No separate cold-weather grade is published for this tool; use a lower-consistency general-purpose grease only if ambient temperature falls outside the standard grease's working range.
Hydraulic rotator bearing (grapple rotate drive)	No fixed fill volume published - grease the fitting until purge is visible at the bearing seal, on the same interval as the jaw pivot pins.	Cat MPGM multipurpose grease, same as the pivot points. The rotator turns on a grease-packed bearing, not an oil-filled gear case, so no separate gear oil or hydraulic-tank spec applies to this tool.

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

Caterpillar GSH15 maintenance schedule

Service interval	Tasks
Every 10 h	Grease the jaw pivot pins and bushings at every grease point listed on the grapple's lube chart. Grease the rotator bearing before the shift starts. Wipe each grease fitting clean before and after greasing to keep grit out of the joint. Cycle the jaws and rotator fully after greasing to work grease into the bearing surfaces. Shorten this interval in wet, muddy, or abrasive scrap and demolition work.
Every 50 h	Inspect the grapple cylinder barrels and rod ends for scoring, pitting, or visible leakage. Check hydraulic hoses and fittings at the carrier-to-grapple connection for chafing, cracking, or seepage. Torque-check mounting bolts and hydraulic line clamps. Check cylinder pin retainers for looseness. Confirm rotator hose routing stays clear of pinch points through full rotation.
Every 250 h	Measure jaw pivot pin and bushing wear against factory limits and note any elongation. Inspect tine tips for wear, cracking, or bending and rotate or replace as needed. Check jaw closing force and travel against baseline to catch early cylinder wear. Inspect the grapple shell and frame welds for cracking around high-stress points. Check the rotator drive coupling for backlash or wear.
Every 500 h	Check the rotator bearing for play, roughness, or seal weeping. Leak-test the rotator hydraulic motor circuit. Inspect cylinder rod seals and wiper seals for early leakage before it worsens. Check tine tip mounting hardware and jaw linkage pins for wear beyond service limits. Review grease consumption trend to catch a failing seal early.
Every 2,000 h	Tear down the jaw linkage and replace worn pivot pins and bushings as a set. Reseal or resleeve grapple cylinders that show bore scoring or rod drift. Replace the rotator bearing and seals as a matched set rather than one component at a time. Replace tine tips and inspect tine shanks for fatigue cracking. Inspect the shell and mounting frame for structural repairs before returning the tool to service.

Servicing the GSH15 beyond the schedule

Predictive maintenance & fluid analysis

The GSH15 has no engine oil to sample, but its hydraulic health still gives early warning signs. Watch the grapple cylinders for rod drift under load, a sign of internal seal wear before external leakage shows up. Check rotator case-drain flow against baseline when the tool feels slow to turn; a rising case-drain reading points to a wearing rotator motor. Track grease consumption at the jaw pivots and rotator bearing - a sudden jump usually means a failing seal, not just heavier use.

Corrective & common repairs

Most GSH15 repairs trace to three wear points: tine tips, cylinder seals, and the carrier hydraulic connection. Worn or cracked tine tips lose bite and should be replaced before they damage the jaw structure. Cylinder rod or barrel seal leaks usually call for a reseal rather than a full cylinder swap. Hose and fitting failures cluster at the connection point to the host excavator's auxiliary circuit; check these first when the grapple loses closing force or rotation speed.

Overhaul & rebuild points

A full GSH15 rebuild centers on the jaw linkage and rotator. Pull and measure all pivot pins and bushings together, since uneven wear on one joint accelerates wear on the rest. Reseal or resleeve the grapple cylinders if the bores show scoring. Replace the rotator bearing and seals as a matched set rather than swapping a single part. Inspect the shell and mounting frame welds for fatigue cracking around the cylinder lugs and pivot bosses before the tool goes back into service.

Seasonal & environment servicing

Scrap yards and demolition sites push grease points harder than average duty. Shorten the grease interval at the jaw pivots and rotator bearing in wet, muddy, or abrasive conditions, and switch to a cold-weather-rated grease when temperatures drop. Rinse accumulated debris from the tine roots and rotator housing so packed material can't work past the seals. Protect exposed hoses at the carrier connection from sharp scrap edges, a common cause of hose failure on demolition sites.

GSH15 attachments & work tools

Carrier compatibility - standard excavators

The GSH15 orange-peel grapple is cataloged against a run of Cat crawler excavators spanning the C and D series: 312C, 315C, 318C, 319C, 320C, 320D, 322C, 323D, 324D, 325D, 328D and 330D. Fitment follows dedicated hydraulic connecting-line groups issued for each carrier size, not a single universal kit.

Carrier compatibility - material handlers

Beyond straight excavators, the tool is also listed for Cat material-handler chassis: M315D, M316D, M318D and M322D, plus MH-badged derivatives such as 322D MH, 325D MH and 330D MH. Each material-handler size again pairs with its own connecting-line kit rather than sharing one across the range.

Mounting / coupler system

Service literature for this grapple does not spell out a generic bucket-style quick-coupler fitment; it is documented as a dedicated work tool paired to the stick through carrier-specific hydraulic plumbing rather than a common pin-grabber coupler. Confirm the exact stick/linkage pinning for a given carrier's arrangement with the dealer or SIS lookup before ordering.

Hydraulic line-kit / plumbing arrangement

Because tine-cylinder flow and pressure needs scale with carrier size, Caterpillar issues a separate connecting-lines group per carrier model rather than one fits-all kit; a kit built for a 320-class excavator will not plumb into a 330-class machine. Multiple production-era line-group revisions exist across the GSH9/GSH15/GSH20/GSH22 family's service life, so the correct kit also depends on the grapple's own serial-prefix range, not just the carrier.

Rotator configuration option

A hydraulic-rotator kit letting the grapple head spin independent of the stick is documented for the B-suffix siblings in this line (GSH9B/GSH15B/GSH20B), not shown as standard on the base GSH15 fixed-mount tool. Treat rotating-mount capability as tied to the B-series variant unless the specific unit's serial/nameplate confirms the rotator option was fitted.

Family size/capacity derivatives

GSH15 sits inside a wider orange-peel grapple family (GSH9 through GSH22, with further -60/-80 size derivatives) scaled to different carrier weight classes. Match the grapple size designation to the carrier class rather than assuming line kits or mounting hardware carry over between the -9, -15, -20 and -22 sizes.

All GSH15 assemblies by section

Every catalogued assembly group for the Caterpillar GSH15. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

259-9621 Housing Gp-Grapple -Hydraulic

09***65	Pin-Cotter	4
15***19	Lockwasher	16
15***21	Lockwasher	4
21***06	Cover	8

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259-9480 Housing Gp-Grapple -Hydraulic

15***19	Lockwasher	8
15***21	Lockwasher	4
21***94	Cylinder & Lines Group-Grapple	1
21***98	Washer; (43x78x7-mm Thk)	4

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Hydraulic System

277-6036 Chart-Specification

27***36

Chart-Specification

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215-6694 Cylinder & Lines Gp-Grapple

10***04	Bolt; (Socket Head) (M10x1.5x30mm)	5
15***18	Lockwasher	5
16***54	Seal	1
19***34	Seal	2

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231-1117 Cylinder & Lines Gp-Grapple

12***41	Seal-O-Ring	2
14***55	Adapter As	8
15***44	Seal	1
15***19	Lockwasher	5

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231-5809 Cylinder Gp-Hydraulic

22***92	Kit-Damper; (Hydraulic Cylinder)	1
22***22	Seal-Wiper	1
22***23	Ring-Wear	2
22***25	Seal-Wiper	1

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215-6708 Cylinder Gp-Hydraulic

21***08	Cylinder Group-Hydraulic	1
21***11	Kit-Seal; (Hydraulic Cylinder)	1
22***92	Kit-Damper; (Hydraulic Cylinder)	1
22***94	Cylinder As	1

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297-7873 Lines Gp-Connecting

23***40	Hose As	2
25***44	Hose As	2
29***73	Lines Group-Connecting	1

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297-7877 Lines Gp-Connecting

23***93	Hose As	2
23***49	Hose As	2
29***77	Lines Group-Connecting	1

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297-7870 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
13***25	Flange-Split	4
14***40	Adapter; (Straight) (-8 Orb X -8 Orfs)	2
18***53	Hose As	2

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297-7872 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
13***25	Flange-Split	4
14***40	Adapter; (Straight) (-8 Orb X -8 Orfs)	2
23***40	Hose As	2

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297-7871 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
13***25	Flange-Split	4
23***53	Hose As	2
23***19	Hose As	2

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297-7874 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
13***25	Flange-Split	4
14***40	Adapter; (Straight) (-8 Orb X -8 Orfs)	2
18***53	Hose As	2

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297-7875 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
13***25	Flange-Split	4
18***53	Hose As	2
23***43	Hose As	2

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297-7869 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
13***25	Flange-Split	4
14***40	Adapter; (Straight) (-8 Orb X -8 Orfs)	2
23***53	Hose As	2

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297-7876 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
13***25	Flange-Split	4
14***40	Adapter; (Straight) (-8 Orb X -8 Orfs)	2
18***53	Hose As	2

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276-8652 Motor & Manifold Gp-Rotator

08***72	Seal-O-Ring	1
15***82	Bolt-Socket Head; (M6x1x40-mm)	4
15***94	Adapter As	2
15***44	Seal	1

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294-7164 Rotator & Mtg Gp-Hydraulic

10***03	Seal-O-Ring	2
14***53	Plug	2
15***19	Lockwasher	5
16***54	Seal	1

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252-9388 Rotator Gp-Hydraulic

15***94	Adapter As	2
15***44	Seal	1
15***21	Lockwasher	8
16***43	Seal	1

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276-8649 Rotator Gp-Hydraulic

09***34	Shim; (T=69.85mm)	2
11***32	Bearing-Sleeve	2
15***19	Lockwasher	7
16***43	Seal	1

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252-9012 Rotator Gp-Hydraulic

14***78	Bolt	10
19***60	Dowel	2
21***20	Bearing As	1
21***21	Bearing As	1

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211-7399 Rotator Gp-Hydraulic

17***08	Bolt-Socket Head; (M24x3x140-mm)	10
19***60	Dowel	2
21***99	Rotator Group-Hydraulic	1
21***20	Bearing As	1

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211-7396 Rotator Gp-Hydraulic

14***78	Lockwasher	8
15***94	Adapter As	2
15***44	Seal	1
16***43	Seal	1

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276-8662 Swivel Gp

16***54	Seal	1
21***68	Plug As	2
27***62	Swivel Group	1
28***13	Ring	1

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Service Equipment And Supplies

259-9437 Plate & Film Gp

13***55	Setscrew; (M4x0.7x8-mm)	2
15***96	Film-Notice; (Lift Eye Location)	1
22***69	Film-Warning; (Do Not Operate, Read Omm)	1
24***18	Film-Warning; (Crush Hazard, Stay Back)	4

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259-9441 Plate & Film Gp

13***55	Setscrew; (M4x0.7x8-mm)	2
15***96	Film-Notice; (Lift Eye Location)	1
22***69	Film-Warning; (Do Not Operate, Read Omm)	1
24***18	Film-Warning; (Crush Hazard, Stay Back)	4

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Work Tool Arrangement

259-9426 Grapple Ar-Orange Peel -Hydraulic, Narrow

25***26	Grapple Ar-Orange Peel; -Hydraulic, Narrow	1
25***37	Plate & Film Group	1
25***75	Grapple Group; -Hydraulic, Narrow	1

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259-9571 Grapple Ar-Orange Peel -Hydraulic, Narrow

25***41	Plate & Film Group	1
25***71	Grapple Ar-Orange Peel; -Hydraulic, Narrow	1
25***16	Grapple Group; -Hydraulic, Narrow	1

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259-9564 Grapple Ar-Orange Peel -Hydraulic, Narrow

25***41	Plate & Film Group	1
25***64	Grapple Ar-Orange Peel; -Hydraulic, Narrow	1
25***12	Grapple Group; -Hydraulic, Narrow	1

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259-9578 Grapple Ar-Orange Peel -Hydraulic, Narrow

25***41	Plate & Film Group	1
25***78	Grapple Ar-Orange Peel; -Hydraulic, Narrow	1
25***20	Grapple Group; -Hydraulic, Narrow	1

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259-9433 Grapple Ar-Orange Peel -Hydraulic, Narrow

25***33	Grapple Ar-Orange Peel; -Hydraulic, Narrow	1
25***37	Plate & Film Group	1
25***79	Grapple Group; -Hydraulic, Narrow	1
27***36	Chart-Specification	1

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Work Tools

259-9475 Grapple Gp -Hydraulic, Narrow

21***85	Head Group-Grapple	1
25***88	Rotator Group-Hydraulic	1
25***25	Shell Group-Grapple; -Hydraulic, Narrow	4
25***75	Grapple Group; -Hydraulic, Narrow	1

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259-9620 Grapple Gp -Hydraulic, Narrow

21***89	Head Group-Grapple	1
21***96	Rotator Group-Hydraulic	1
25***81	Shell Group-Grapple; -Hydraulic, Narrow	4
25***20	Grapple Group; -Hydraulic, Narrow	1

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259-9616 Grapple Gp -Hydraulic, Narrow

21***89	Head Group-Grapple	1
21***96	Rotator Group-Hydraulic	1
25***77	Shell Group-Grapple; -Hydraulic, Narrow	4
25***16	Grapple Group; -Hydraulic, Narrow	1

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259-9612 Grapple Gp -Hydraulic, Narrow

21***89	Head Group-Grapple	1
21***96	Rotator Group-Hydraulic	1
25***72	Shell Group-Grapple; -Hydraulic, Narrow	4
25***12	Grapple Group; -Hydraulic, Narrow	1

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259-9479 Grapple Gp -Hydraulic, Narrow

21***85	Head Group-Grapple	1
25***88	Rotator Group-Hydraulic	1
25***29	Shell Group-Grapple; -Hydraulic, Narrow	4
25***79	Grapple Group; -Hydraulic, Narrow	1

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215-6685 Head Gp-Grapple

14***78	Lockwasher	6
17***73	Pin-Spring	2
21***85	Head Group-Grapple	1
21***87	Head As	1

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211-7389 Head Gp-Grapple

14***78	Lockwasher	12
18***16	Pin-Spring	2
21***89	Head Group-Grapple	1
21***91	Head As	1

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292-4064 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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292-4065 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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292-4066 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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292-4067 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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298-1192 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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289-9460 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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298-3534 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***90	Pin	1

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292-8523 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***90	Pin	1

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298-1286 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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298-2343 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***90	Pin	1

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292-4774 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***90	Pin	1

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292-8522 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***90	Pin	1

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290-3180 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***90	Pin	1

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292-4773 Link Gp-Grapple

09***65	Pin-Cotter	1
21***29	Washer; (54x98x8-mm Thk)	1
21***16	Nut; (Hex Slotted)	1
28***25	Pin	1

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233-1341 Pin Gp

21***59	Pin As	1
23***41	Pin Group	1
7X***52	Bolt-Plt; (M16 X 2.0 X 30)	1
7Y***10	Washer-Special; (17x65x6-mm Thk)	1

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258-7872 Shell Gp-Grapple -Hydraulic, Narrow

14***78	Lockwasher	2
18***20	Locknut; (M20x2.5-Thd)	2
23***07	Tip	1
25***80	Cover As	1

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258-6329 Shell Gp-Grapple -Hydraulic, Narrow

14***78	Lockwasher	2
18***20	Locknut; (M20x2.5-Thd)	2
21***29	Tip	2
21***30	Cover As	1

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258-6325 Shell Gp-Grapple -Hydraulic, Narrow

14***78	Lockwasher	2
18***20	Locknut; (M20x2.5-Thd)	2
21***29	Tip	2
21***30	Cover As	1

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258-7881 Shell Gp-Grapple -Hydraulic, Narrow

14***78	Lockwasher	2
18***20	Locknut; (M20x2.5-Thd)	2
23***07	Tip	1
25***37	Shell As	1

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258-7877 Shell Gp-Grapple -Hydraulic, Narrow

14***78	Lockwasher	2
18***20	Locknut; (M20x2.5-Thd)	2
23***07	Tip	1
25***80	Cover As	1

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GSH15 serial number reference

The GSH15's PIN plate is riveted or stamped onto the tool's own housing/frame near the mounting brackets, not on the carrier excavator. Look for a small CATERPILLAR tag with a 17-character Product Identification Number; the first 3 characters of the trailing 8-character serial are the prefix (e.g. H2X, H2Y, HGL), and the remaining digits are the sequential unit number, with '-UP' meaning that prefix block runs open-ended from that point forward. Match the full prefix, not just the digits, before ordering parts, since different prefixes carry different housing/cylinder groups.

Prefix	Identifies	Notes
H2X1-UP	Base cylinder group, GSH15 & GSH20 shared machine PIN series	Base machine serial prefix in the dedicated GSH15 & GSH20 Orange Peel Grapple parts manual. Tine-actuating cylinder measures 80 mm (3.15 in) bore x 180 mm (7.09 in) stroke. Paired with earlier carrier linkage (M312-M316 class, 320B/320C generation excavators). Exact calendar years not published; treat as the earlier block relative to H2Y1-UP in the same manual.
H2Y1-UP	Larger-bore cylinder group, GSH15 & GSH20 shared machine PIN series	Same dedicated GSH15 & GSH20 parts manual as H2X1-UP, covering a larger tine-actuating cylinder: 90 mm (3.54 in) bore x 230 mm (9.06 in) stroke. Matched to D-series-linkage carriers (320D, 322C, 323D, 324D, 325D, 328D, 330D class excavators). Runs alongside or after H2X1-UP in the same book; exact split point and years not documented.
HGL1-UP	Open-configuration grapple head/cylinder group, shared GSH9/GSH15/GSH20/GSH22 parts book	Filed under the GSH15's own listing in a later shared Orange Peel Grapple parts manual that also covers GSH9, GSH20 and GSH22, each carrying its own distinct prefix in that book. Covers the open hydraulic grapple/work-tool group for the GSH15. Confirm with your dealer before ordering against it.

Frequently asked questions

Does the Cat GSH15 have its own engine?

No. The GSH15 is a hydraulic work tool with no engine, transmission, or fuel system of its own. It runs off the host excavator's or material handler's hydraulic circuit, which powers both the grapple-closing cylinders and the rotator.

What carrier size does the GSH15 fit?

The GSH15 is sized for roughly 15-tonne-class carriers. Caterpillar lists it for crawler excavators from the 312C through 330D range and for M-series material handlers such as the M315D through M322D, plus MH-badged carriers like the 322D MH, 325D MH, and 330D MH. Each carrier needs its own hydraulic connecting-line kit.

What replaced the GSH15?

Caterpillar succeeded the GSH15 with the B-series orange-peel grapple line (GSH15B), which brought a revised rotator design. Specs or rotator options published for the B-series should not be assumed to carry over to the original GSH15.

What GSH15 owners discuss

What wears out first on a GSH15 and how do owners deal with it?

Tine tips take the brunt of the work. Owners run replaceable tips rather than swapping the whole tine once a point rounds off or cracks from repeated penetration into scrap piles. Catching tip wear early and rotating or replacing tips before the tine body itself starts thinning keeps the tine steel serviceable for the tool's full working life. On a grapple used daily in scrap or demolition service, tip replacement comes up well before any other wear item needs attention.

What hydraulic problems come up most with the GSH15's closing cylinders?

Rod seal leakage is the most common complaint, especially on cylinders that sit exposed to falling debris and abrasive fines. A nicked or scored rod from scrap contact tears a new seal quickly, so owners check rod finish regularly and reseal proactively rather than waiting for a full weep. Configurations that guard or shroud the cylinder rod hold up better in heavy scrap and demolition duty than a fully exposed rod. Have your dealer verify rod condition and seal fit if a reseal doesn't stop the leak.

How reliable is the rotator, and what should I know about continuous rotation?

The rotator uses a gerotor-type hydraulic motor for 360-degree rotation with no direction limit, so there's no hose-wrap stop to manage. The wear points reported are the rotator's internal bearing and seal package; leakage past the seal shows up as a slower cycle time or oil weeping at the rotator housing before it shows up as visible play. Factory service checks treat rotator cycle time and leakage as the first diagnostic when rotation feels sluggish or inconsistent under load, ahead of suspecting the carrier's pump or valve.

Are hose and fitting failures common at the excavator-to-grapple connection?

Yes, this is a recurring complaint. The hose runs between the stick and the grapple see the most flex and abrasion cycles, and that's where most leaks start. Fittings loosen or start seeping after repeated cycling; if retorquing doesn't stop it, worn threads or a bad sealing washer are the usual cause underneath. Routing hoses clear of the tine swing path and pinch points, and inspecting the quick-disconnect and swivel end of the circuit on a set schedule, cuts down on repeat failures.

How much grease does a GSH15 need, and where?

Grease the rotator bearing and pinion and the tine pivot pins every shift in continuous scrap or demolition work. Skipped grease points show up first as pin wear and looseness in the tine linkage before anything else fails. Grease fittings on this class of grapple sit in accessible spots so there's no need to pull guards to reach them. Tools run less than full-time can stretch the interval, but daily greasing is standard practice in dusty or gritty environments.

What size excavator does a GSH15 need, and can it be swapped between carriers?

The GSH15 designation lines up with roughly a 15-metric-ton-class excavator, matching Cat's naming pattern across the GSH9, GSH15, GSH20, and GSH22 orange-peel line, where the model number tracks the intended carrier weight class. An undersized carrier starves the rotator and cylinders of flow and pressure; a much larger one can overpower the tine structure. Match the host machine's auxiliary hydraulic flow and pressure to the tool's rated circuit, not just carrier tonnage, before moving it between machines.

What should I check before buying a used GSH15?

Cycle the rotator through several full rotations in both directions. Roughness or an uneven, slowing cycle time points to internal rotator wear. Inspect every tine tip and the tine body behind it for cracking, not just tip rounding. Check cylinder rods for scoring and look for fresh oil at rod seals, the rotator housing, and every hose fitting in the circuit. Confirm the tine pivot pins have no excess play; loose pins mean the bushings are worn. This tool carries no engine or onboard electronics, so condition comes down entirely to hydraulic and structural wear. Have your dealer verify rotator internal condition and structural welds before finalizing a used purchase.

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

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