Caterpillarwork toolgrapple-dem/sort

Caterpillar G310B

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar G310B is a hydraulically actuated demolition and sorting grapple attachment, not a self-propelled machine. It pairs cylinder-driven jaws with a gerotor-type rotator that gives the tool continuous 360-degree rotation, mounting to a host excavator's stick through a pin-on coupler. Operating weight runs roughly 980-1,030 kg (2,160-2,270 lb), with a jaw opening of about 1,800 mm (70.9 in) and a material capacity of 375-400 L, and closing force rated around 36-37 kN. The tool draws all of its power from the host carrier's hydraulic system through auxiliary circuits for jaw open/close and rotation, and carries no engine, fuel tank, cooling system, or onboard reservoir of its own. Caterpillar sized the G310B for host excavators in roughly the 11-17.6 tonne class, aligning with the 311-316 series. It is offered in a skeleton (open shell) configuration built for demolition work where debris needs to fall through the jaw, and a closed shell configuration aimed at higher-volume material sorting.

Caterpillar introduced the G310B as part of a demolition and sorting grapple line that also included the larger G315B and G320B, documented together in a single factory brochure. Later Cat literature broadened the family further, extending the range up through the G325B and G330 as part of a wider demolition and sorting grapple lineup built for progressively larger excavator classes. Each model kept its own weight, jaw opening, and capacity ratings tied to its intended host size, so none of those larger siblings' specifications carry over to the G310B. This shared brochure history matters in the used and parts market today, since attachment listings, pin-on brackets, and wear parts are often cataloged across the whole family; confirming the specific model and serial identity before assuming a part or spec applies across the line is worthwhile.

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 G310B specifications

Weights

Operating weight (incl. mounting bracket)

980-1,030 kg (2,160-2,270 lb). Range reflects the two shell versions (Recycling vs Demolition) and revisions of the spec sheet across the model's production run.

Dimensions

Overall width (shell)	850 mm (33.5 in)
Overall height (shell)	520 mm (20.5 in)
Width, jaws closed	1,225-1,245 mm (48.2-49.0 in)
Width, jaws open	1,800 mm (70.9 in)
Height, jaws closed (with bracket)	1,435-1,440 mm (56.5-56.7 in)
Height, jaws open (with bracket)	1,345-1,359 mm (53.0-53.5 in)

Performance

Jaw opening width	1,800 mm (70.9 in)
Rated capacity	375-400 liters (0.49-0.52 cu yd), depending on shell version — Recycling shell rated higher volume, Demolition shell lower volume with a heavier-duty tine
Closing force	36-37 kN (8,090-8,320 lbf)
Cycle time, closing	approx. 3.2 seconds
Rotation	Full 360-degree hydraulic rotation through a maintenance-free rotator; no published rpm or torque rating
Recommended host carrier weight class	10-16 tonnes (22,000-35,200 lb); matches the Cat 311-316 and M313-M316 excavator range

Hydraulic requirements

Open/close circuit — maximum pressure	350 bar (5,075 psi)
Open/close circuit — optimal flow	60 l/min (15.9 gpm)
Rotation circuit — maximum pressure	320 bar (4,640 psi)
Rotation circuit — optimal flow	25 l/min (6.6 gpm)
Circuits required from host machine	Two auxiliary hydraulic circuits: one for grapple open/close, one for rotation. No onboard reservoir — oil is supplied entirely by the host excavator.

Service capacities (summary)

Service interval	100 hours
Grease points	Hinge pins and bushings only, reached through large inspection covers; the rotator itself is maintenance-free
Fluid capacities	None separately specified — no engine, fuel tank, or cooling system on this tool. It runs on the host excavator's own hydraulic oil supply.

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

G310B fluids & capacities

System	Capacity	Recommended fluid
Grease points (grapple pivot pins, tine/jaw bushings, mounting/coupler bracket)	N/A — regrease interval only; exact interval not published in available documentation for this tool	Not confirmed against a G310B-specific published lubrication chart. General Cat work-tool pin-and-bushing standard is Cat MPGM (moly-disulfide multipurpose grease); confirm exact grease type and interval with your Cat dealer or this tool's OMM.

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

Caterpillar G310B maintenance schedule

Service interval	Tasks
Every 10 h	Grease all jaw pivot pins and cylinder rod-end/base-end bushings. Visually inspect hydraulic hoses, fittings, and quick-couplers for leaks, abrasion, or chafing. Check shell wear tines and cutting edges for cracks or excessive wear. Confirm the rotator turns smoothly through its full rotation with no binding or hesitation.
Every 50 h	Re-grease pivot pins, bushings, and the rotator bearing race under heavier duty cycles. Inspect cylinder rods for scoring, pitting, or seal weep. Check the mounting bracket and pin-on coupler retaining hardware for looseness. Clear packed debris from the jaw linkage and shell interior.
Every 100 h	Grease every pivot point, cylinder pin, and the rotator bearing per the documented service interval. Inspect all hydraulic hoses, fittings, and the rotator swivel connection for wear, and torque loose fasteners. Check jaw alignment and closing action; adjust linkage if opening/closing is uneven. Inspect shell and tine wear surfaces and rotate or replace field-replaceable edges as needed. Inspect rotator seals for weep and verify smooth rotation under load.
Every 250 h	Inspect cylinder pins and bushings for measurable wear or play and replace as needed. Check the rotator seal area more closely for oil discoloration or accumulating weep. Inspect structural welds on the jaw arms and shell for cracking. Verify auxiliary circuit hose routing and clamps are not chafing against the host boom or stick.
Every 500 h	Disassemble and inspect pivot pin and bushing sets for wear beyond service limits and replace as needed. Check cylinder seals for internal bypass and reseal if drift is evident. Inspect rotator internal seals and bearing surfaces for wear and replace if leaking. Assess shell and tine wear surfaces for weld-overlay buildup needs.
Every 1,000 h	Perform a full teardown inspection of the jaw cylinders, pins, and bushings. Rebuild or replace the rotator seals and bearing as required. Weld-overlay or replace worn shell and tine wear surfaces. Inspect and pressure-test auxiliary circuit hoses and fittings.
Every 2,000 h	Complete a structural inspection of the jaw arms, shell body, and mounting bracket for fatigue cracking. Perform a full rotator rebuild (bearing, seals, gear train) or fit a factory exchange unit. Reseal or replace the jaw cylinders as needed. Reassess overall tool condition against wear limits to decide between rebuild and replacement.

Servicing the G310B beyond the schedule

Predictive Maintenance & Fluid Analysis

Because the G310B carries no engine or reservoir of its own, hydraulic health tracks the host carrier's oil condition. Pull fluid samples on the host machine's normal analysis interval and watch for contamination trends that coincide with heavy grapple use, since the jaw cylinders and rotator swivel add wear surfaces to the same circuit. Inspect the rotator seal weep point regularly; a steady oil film there signals seal wear well before rotation binds or leakage worsens, giving time to plan a reseal before the tool is sidelined mid-job.

Corrective & Common Repairs

Typical G310B repairs center on the jaw cylinders, hoses, and pivot hardware. Reseal a cylinder as soon as rod scoring or external weep appears, since early teardown is cheaper than the bushing wear a slow leak causes downstream. Replace auxiliary hoses at the first sign of abrasion or bulging rather than waiting for a burst, given the tool works close to boom pinch points. Pivot pins and bushings wear unevenly under grapple twisting loads, so check play at each joint before it transfers stress into the jaw arms.

Overhaul & Rebuild Points

When shell or tine wear surfaces thin out, weld-overlay rebuild restores the profile more cheaply than swapping the whole shell, provided the structure underneath is still sound and crack-free. Once cracking or heavy deformation shows up in the jaw arms or shell body, replacement is the safer call. The rotator is the other major rebuild item: internal seal and bearing wear shows up as rotation drag or oil weep at the swivel, and a rebuild or factory exchange unit restores smooth rotation rather than running a degraded rotator indefinitely.

Seasonal & Environment Servicing

Cold-weather operation calls for a lighter-consistency grease at pivot pins and the rotator bearing so lubricant keeps flowing into the joint instead of channeling; skipping this in freezing conditions accelerates dry-pin wear. In hot, dry demolition environments, fine debris packs into the jaw linkage and shell interior faster, so shorten the interval for clearing packed material and inspecting wear tines. Both extremes call for closer checks of hose fittings and quick-couplers, since temperature swings affect seal fit and clamp tightness on the auxiliary circuit connections.

G310B attachments & work tools

Demolition vs. sorting configuration

The G310B is built as a combination demolition-and-sorting grapple, not two separate purchasable tools. Cat work-tool documentation lists a distinct demolition-specific arrangement under the G310B parts structure, and dealer literature markets the same jaw set for primary/secondary demolition, debris sorting, and container loading. Treat demolition and sorting as duty settings of one grapple rather than a hard model split unless a dealer quote specifies a dedicated shell swap.

Shell and cutting-edge options

This grapple platform offers two shell styles: an open/skeleton shell for primary and secondary demolition and other harsh, high-impact duty, and a closed shell for high-volume sorting and handling of large, bulky material. Left and right shell halves carry wear-grade cutting edges/tines at the jaw line that are field-replaceable rather than fixed to the casting.

Mounting to host excavator

The G310B fits its carrier through a dedicated pin-on mounting bracket matched to the excavator's stick/linkage class and pin spacing, not a universal fitting. No G310B-specific factory quick-coupler kit is confirmed; use through a hydraulic quick-coupler depends on the coupler's own bracket adapter rather than a coupler option built for this grapple.

Carrier excavator weight class

Rated for carrier machines in roughly the 11-17.6 metric ton (about 24,300-38,800 lb) operating-weight class, aligning with Cat's smaller mid-size crawler excavators (fitment reported across roughly the 311-316 size range). Confirm against the specific carrier's stick linkage before ordering, since bracket fitment, not grapple capacity, is the limiting factor.

Rotation and hydraulic drive

360-degree hydraulic rotation is built into the base grapple through an integral high-torque rotation motor; it ships as standard, not as a separate factory rotator option. Jaw open/close and rotation both draw off the carrier's auxiliary hydraulic circuit, with no distinct bolt-on hydraulic kit beyond the carrier's standard grapple/thumb auxiliary plumbing indicated.

All G310B assemblies by section

Every catalogued assembly group for the Caterpillar G310B. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

223-4659 Housing & Shell Gp-Grapple

09***54	Seal; (Id=79.85mm)	8
14***78	Lockwasher	7
16***58	Bushing; (50mm)	2
22***59	Housing & Shell Group-Grapple	1

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225-3602 Housing & Shell Gp-Grapple

09***54	Seal; (Id=79.85mm)	8
14***78	Lockwasher	7
16***58	Bushing; (50mm)	2
22***64	Pin	4

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195-0224 Housing & Shell Gp-Grapple

09***34	Shim; (T=69.85mm)	4
15***21	Lockwasher	7
19***24	Housing & Shell Group-Grapple	1
22***07	Cylinder & Lines Group-Grapple	1

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220-8500 Housing & Shell Gp-Grapple

09***33	Seal Stk Link, Bkt Link & Cyl	4
15***21	Lockwasher	7
22***00	Housing & Shell Group-Grapple	1
22***04	Cylinder & Lines Group-Grapple	1

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220-8511 Housing & Shell Gp-Grapple

09***33	Seal Stk Link, Bkt Link & Cyl	4
15***21	Lockwasher	7
22***04	Cylinder & Lines Group-Grapple	1
22***11	Housing & Shell Group-Grapple	1

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220-8521 Housing & Shell Gp-Grapple

09***34	Shim; (T=69.85mm)	4
15***21	Lockwasher	7
22***07	Cylinder & Lines Group-Grapple	1
22***21	Housing & Shell Group-Grapple	1

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282-9859 Housing Gp-Grapple

09***33	Seal Stk Link, Bkt Link & Cyl	8
22***38	Bearing-Sleeve	4
28***49	Housing As	1
28***59	Housing Group-Grapple	1

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225-8701 Housing Gp-Grapple

09***33	Seal Stk Link, Bkt Link & Cyl	8
22***01	Housing As	1
22***38	Bearing-Sleeve	4
22***01	Housing Group-Grapple	1

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282-9860 Housing Gp-Grapple

09***34	Shim; (T=69.85mm)	8
22***39	Bearing-Sleeve	4
28***50	Housing As	1
28***60	Housing Group-Grapple	1

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225-8704 Housing Gp-Grapple

09***34	Shim; (T=69.85mm)	8
19***22	Housing As	1
22***39	Bearing-Sleeve	4
22***04	Housing Group-Grapple	1

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Hydraulic System

255-2309 Chart-Connecting Lines -G315b

25***09

Chart-Connecting Lines; -G315b

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252-5700 Chart-Connecting Lines

25***00

Chart-Connecting Lines

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255-2311 Chart-Connecting Lines -G320b

25***11

Chart-Connecting Lines; -G320b

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220-8504 Cylinder & Lines Gp-Grapple

14***70	Elbow, 90°,-8 Orb Swiv. /-8 Orfs	4
15***94	Adapter As	4
15***44	Seal	1
15***18	Lockwasher	5

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285-8291 Cylinder & Lines Gp-Grapple

09***73	Bolt; (Socket Head) (M12x1.75x60mm)	8
14***92	Elbow; (-12 Orfs/-12 Orfs Swivel)	4
15***19	Lockwasher	8
16***43	Seal	1

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288-1392 Cylinder & Lines Gp-Grapple

15***94	Adapter As	4
15***44	Seal	1
22***78	Hose As	2
28***92	Cylinder & Lines Group-Grapple	1

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288-1391 Cylinder & Lines Gp-Grapple

14***70	Elbow, 90°,-8 Orb Swiv. /-8 Orfs	4
15***94	Adapter As	4
15***44	Seal	1
22***89	Cylinder Group-Hydraulic	1

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220-8507 Cylinder & Lines Gp-Grapple

15***94	Adapter As	4
15***44	Seal	1
15***18	Lockwasher	5
19***34	Seal	2

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339-0006 Cylinder Gp-Grapple

09***54	Seal; (Id=79.85mm)	4
09***88	Setscrew	1
16***84	Kit-Seal	1
22***40	Bearing-Sleeve	2

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224-0188 Cylinder Gp-Hydraulic

09***34	Shim; (T=69.85mm)	2
22***88	Cylinder Group-Hydraulic	1
22***75	Kit-Seal	1
22***39	Bearing-Sleeve	1

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303-6525 Cylinder Gp-Hydraulic

09***34	Shim; (T=69.85mm)	4
22***75	Kit-Seal	1
22***39	Bearing-Sleeve	2
22***61	Head	1

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229-9828 Cylinder Gp-Hydraulic

09***54	Seal; (Id=79.85mm)	2
22***40	Bearing-Sleeve	1
22***28	Cylinder Group-Hydraulic	1
22***34	Cylinder Group-Hydraulic	1

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224-0189 Cylinder Gp-Hydraulic

09***33	Seal Stk Link, Bkt Link & Cyl	2
22***89	Cylinder Group-Hydraulic	1
22***31	Kit-Seal	1
22***38	Bearing-Sleeve	1

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303-6529 Cylinder Gp-Hydraulic -Grapple

09***54	Seal; (Id=79.85mm)	4
09***88	Setscrew	1
22***76	Kit-Seal; (Hydraulic Cylinder)	1
22***40	Bearing-Sleeve	2

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224-0187 Cylinder Gp-Hydraulic

09***54	Seal; (Id=79.85mm)	2
12***68	Rod-Threaded	1
22***87	Cylinder Group-Hydraulic	1
22***76	Kit-Seal; (Hydraulic Cylinder)	1

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229-8529 Cylinder Gp-Hydraulic

09***33	Seal Stk Link, Bkt Link & Cyl	2
14***88	Fitting	1
17***44	Seal-O-Ring	1
22***38	Bearing-Sleeve	1

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229-9258 Cylinder Gp-Hydraulic

09***34	Shim; (T=69.85mm)	2
14***88	Fitting	1
22***39	Bearing-Sleeve	1
22***58	Cylinder Group-Hydraulic	1

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244-3147 Fitting Gp-Hydraulic

11***49	Fitting; (Quick Disconnect, Male)	2
11***54	Cap	2
24***47	Fitting Group-Hydraulic	1

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244-3146 Fitting Gp-Hydraulic

23***81	Cap-Dust	2
23***82	Kit-Repair; (Quick Disconnect)	1
24***62	Fitting Group-Hydraulic; (Quick Disconnect, Female)	2
24***46	Fitting Group-Hydraulic	1

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233-7827 Lines Gp-Connecting

23***27	Lines Group-Connecting	1
23***68	Lines Group-Connecting	1
23***95	Lines Group-Connecting	1

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235-5048 Lines Gp-Connecting

1P***04	Seal - Rectangular (45mm Dia)	2
1P***67	Flange-Half (43.31 mm Id)	4
23***48	Lines Group-Connecting	1
24***23	Hose As	2

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239-9251 Lines Gp-Connecting

1P***04	Seal - Rectangular (45mm Dia)	2
1P***67	Flange-Half (43.31 mm Id)	4
23***81	Hose As	2
23***51	Lines Group-Connecting	1

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244-3140 Lines Gp-Connecting

23***69	Lines Group-Connecting	1
24***21	Lines Group-Connecting	1
24***40	Lines Group-Connecting	1

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233-7828 Lines Gp-Connecting

23***28	Lines Group-Connecting	1
23***74	Lines Group-Connecting	1
23***98	Lines Group-Connecting	1

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233-7824 Lines Gp-Connecting

23***24	Lines Group-Connecting	1
23***66	Lines Group-Connecting	1
23***90	Lines Group-Connecting	1

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235-5052 Lines Gp-Connecting

12***40	Fitting As-Hydraulic; (Quick Disconnect, Male)	2
23***08	Hose As	2
23***52	Lines Group-Connecting	1

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234-5698 Lines Gp-Connecting

12***40	Fitting As-Hydraulic; (Quick Disconnect, Male)	2
23***98	Lines Group-Connecting	1
23***08	Hose As	2

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234-5666 Lines Gp-Connecting

1P***02	Seal-Rectangular 28.83mm(1.136in) Id	2
23***66	Lines Group-Connecting	1
23***41	Hose As	2
8T***23	Bolt-Socket Head; (M10x1.5x45-mm)	8

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235-5051 Lines Gp-Connecting

14***40	Adapter; (Straight) (-8 Orb X -8 Orfs)	2
23***08	Hose As	2
23***51	Lines Group-Connecting	1
3K***60	Seal Pilot Manifold On; Seal To Boom Check Valve Drain	1

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244-3021 Lines Gp-Connecting

23***08	Hose As	2
24***21	Lines Group-Connecting	1

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234-5689 Lines Gp-Connecting

11***49	Fitting; (Quick Disconnect, Male)	2
23***89	Lines Group-Connecting	1
23***89	Hose As	2

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234-5665 Lines Gp-Connecting -Open, Close

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
16***43	Seal	1
17***05	Adapter As	2
23***65	Lines Group-Connecting; -Open, Close	1

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233-7833 Lines Gp-Connecting

23***33	Lines Group-Connecting	1
23***48	Lines Group-Connecting	1
23***52	Lines Group-Connecting	1

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244-3144 Lines Gp-Connecting

23***48	Lines Group-Connecting	1
23***51	Lines Group-Connecting	1
24***44	Lines Group-Connecting	1

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244-3141 Lines Gp-Connecting

23***68	Lines Group-Connecting	1
24***21	Lines Group-Connecting	1
24***41	Lines Group-Connecting	1

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234-5669 Lines Gp-Connecting

1P***04	Seal - Rectangular (45mm Dia)	2
1P***67	Flange-Half (43.31 mm Id)	4
23***69	Lines Group-Connecting	1
24***71	Hose As	2

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234-5668 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
10***90	Adapter As	2
12***96	Flange-Half	4
23***68	Lines Group-Connecting	1

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234-5690 Lines Gp-Connecting

11***49	Fitting; (Quick Disconnect, Male)	2
23***90	Lines Group-Connecting	1
23***08	Hose As	2
6V***98	Seal-O-Ring -Line From Gear Pump Output	2

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239-9250 Lines Gp-Connecting

23***50	Lines Group-Connecting	1
23***51	Lines Group-Connecting	1
23***52	Lines Group-Connecting	1

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234-5695 Lines Gp-Connecting

12***40	Fitting As-Hydraulic; (Quick Disconnect, Male)	2
23***95	Lines Group-Connecting	1
23***08	Hose As	2

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234-5674 Lines Gp-Connecting

09***70	Bolt-Socket Hd; (M12 X 1.75 X 45)	8
10***90	Adapter As	2
12***96	Flange-Half	4
23***74	Lines Group-Connecting	1

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244-3143 Lines Gp-Connecting

23***74	Lines Group-Connecting	1
23***51	Lines Group-Connecting	1
24***43	Lines Group-Connecting	1

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244-3022 Lines Gp-Connecting

23***08	Hose As	2
24***22	Lines Group-Connecting	1
6V***98	Seal-O-Ring -Line From Gear Pump Output	2
6V***55	Nut-Face Seal; (1-14-Thd)	2

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233-7834 Lines Gp-Connecting

23***34	Lines Group-Connecting	1
23***48	Lines Group-Connecting	1
23***51	Lines Group-Connecting	1

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233-7825 Lines Gp-Connecting

23***25	Lines Group-Connecting	1
23***65	Lines Group-Connecting; -Open, Close	1
23***89	Lines Group-Connecting	1

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233-7826 Lines Gp-Connecting

23***26	Lines Group-Connecting	1
23***68	Lines Group-Connecting	1
23***90	Lines Group-Connecting	1

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239-9252 Lines Gp-Connecting

23***52	Lines Group-Connecting	1
25***45	Hose As	2
3K***60	Seal Pilot Manifold On; Seal To Boom Check Valve Drain	2
6V***98	Seal-O-Ring -Line From Gear Pump Output	2

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244-3142 Lines Gp-Connecting

23***68	Lines Group-Connecting	1
24***22	Lines Group-Connecting	1
24***42	Lines Group-Connecting	1

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233-7831 Lines Gp-Connecting

23***31	Lines Group-Connecting	1
23***69	Lines Group-Connecting	1
23***90	Lines Group-Connecting	1

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170-2174 Manifold Gp-Control

14***20	Bolt-Socket Head; (M6x1x75-mm)	4
17***74	Manifold Group-Control	1
7Y***19	Seal-O-Ring (Id=12.37mm)	2

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270-7532 Motor & Manifold Gp-Rotator

17***73	Motor Group-Gerotor	1
17***74	Manifold Group-Control	1
17***77	Gear-Drive; (15-Teeth)	1
27***32	Motor & Manifold Group-Rotator	1

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170-2173 Motor Gp-Gerotor

17***73	Motor Group-Gerotor	1
17***21	Kit-Housing	1
17***22	Shaft-Output	1
17***25	Key-Square	1

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195-0223 Rotator & Mtg Gp-Hydraulic

14***78	Lockwasher	2
15***19	Lockwasher	8
15***21	Lockwasher	4
16***43	Seal	1

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295-6540 Rotator & Mtg Gp-Hydraulic

14***82	Fitting	2
14***53	Plug	2
14***86	Fitting As	2
15***36	Film-Warning; (Read Operation Manual)	1

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217-2805 Rotator Gp-Hydraulic

21***05	Rotator Group-Hydraulic	1
21***19	Bearing As	1
21***18	Bolt; (M18x2.5x120-mm)	10
6T***45	Dowel	2

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272-2204 Rotator Gp-Hydraulic

13***55	Setscrew; (M4x0.7x8-mm)	2
14***78	Lockwasher	4
14***92	Elbow; (-12 Orfs/-12 Orfs Swivel)	4
15***19	Lockwasher	8

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282-9857 Rotator Gp-Hydraulic

08***72	Seal-O-Ring	1
12***28	Adaptor - Includes:-	2
14***67	Elbow Group; (Each Includes)	2
14***89	Hose Assem.	2

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270-4968 Rotator Gp-Hydraulic

13***80	Hose As; (Nom 06, L=450mm)	2
14***67	Elbow Group; (Each Includes)	2
15***94	Adapter As	2
15***95	Adapter As	4

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281-5458 Swivel Gp

14***53	Plug	2
14***81	Plug	2
17***44	Plate-Locking	1
27***65	Ring	1

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170-3045 Swivel Gp

16***43	Seal	1
17***45	Swivel Group	1
17***41	Stator	1
17***42	Rotor	1

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Service Equipment And Supplies

176-8186 Plate & Film Gp

13***55	Setscrew; (M4x0.7x8-mm)	2
15***44	Film-Warning; (Flying Debris)	2
15***19	Lockwasher	12
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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282-9845 Plate & Film Gp

15***19	Lockwasher	12
22***51	Cover-Access	2
22***69	Film-Warning; (Do Not Operate, Read Omm)	2
23***23	Film-Identification; (Cat, G315b)	2

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272-9603 Plate & Film Gp

15***19	Lockwasher	12
22***51	Cover-Access	2
22***69	Film-Warning; (Do Not Operate, Read Omm)	2
23***24	Film-Identification; (Cat, G320b)	2

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176-8185 Plate & Film Gp

13***55	Setscrew; (M4x0.7x8-mm)	2
15***44	Film-Warning; (Flying Debris)	2
15***19	Lockwasher	12
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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220-8519 Plate & Film Gp

13***55	Setscrew; (M4x0.7x8-mm)	2
15***44	Film-Warning; (Flying Debris)	2
15***19	Lockwasher	12
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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220-8509 Plate & Film Gp

13***55	Setscrew; (M4x0.7x8-mm)	2
15***44	Film-Warning; (Flying Debris)	2
15***19	Lockwasher	12
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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341-9100 Plate & Film Gp

15***19	Lockwasher	12
22***51	Cover-Access	2
24***76	Film-Warning; (Do Not Operate, Read Omm)	2
27***30	Film-Identification; (Cat G325b)	2

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282-9843 Plate & Film Gp

15***19	Lockwasher	12
22***51	Cover-Access	2
22***69	Film-Warning; (Do Not Operate, Read Omm)	2
23***22	Film-Identification; (Cat, G310b)	2

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Work Tool Arrangement

282-9375 Grapple Ar

13***55	Setscrew; (M4x0.7x8-mm)	2
14***82	Fitting	2
14***86	Fitting As	2
15***44	Seal	1

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282-9373 Grapple Ar

13***55	Setscrew; (M4x0.7x8-mm)	2
14***82	Fitting	2
14***86	Fitting As	2
15***44	Seal	1

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179-2091 Grapple Ar-Demolition

14***82	Fitting	2
14***83	Fitting As	2
16***43	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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220-8508 Grapple Ar-Demolition

14***82	Fitting	2
14***83	Fitting As	2
16***43	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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223-4657 Grapple Ar-Demolition

14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1
20***44	Box As-Storage; (Tool)	1

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341-6919 Grapple Ar-Demolition

13***55	Setscrew; (M4x0.7x8-mm)	2
14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1

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282-9369 Grapple Ar-Hydraulic

13***55	Setscrew; (M4x0.7x8-mm)	2
14***82	Fitting	2
14***86	Fitting As	2
15***44	Seal	1

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282-9371 Grapple Ar-Hydraulic

13***55	Setscrew; (M4x0.7x8-mm)	2
14***82	Fitting	1
14***86	Fitting As	2
15***44	Seal	1

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225-3599 Grapple Ar-Sorting

14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1
20***44	Box As-Storage; (Tool)	1

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220-8518 Grapple Ar-Sorting

14***82	Fitting	2
14***83	Fitting As	2
16***43	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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179-2090 Grapple Ar-Sorting

14***82	Fitting	2
14***83	Fitting As	2
16***43	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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Work Tools

325-5970 Bracket Gp-Mounting

13***55	Setscrew; (M4x0.7x8-mm)	2
16***82	Bolt-Socket Head; (M24x3x70-mm)	10
32***70	Bracket Group-Mounting	1
32***72	Bracket As	1

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298-7706 Bracket Gp-Mounting

12***76	Washer; (13x40x3-mm Thk)	2
13***55	Setscrew; (M4x0.7x8-mm)	2
16***82	Bolt-Socket Head; (M24x3x70-mm)	10
29***06	Bracket Group-Mounting	1

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169-4966 Bracket Gp-Mounting

12***76	Washer; (13x40x3-mm Thk)	2
16***66	Bracket Group-Mounting	1
16***83	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	10

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233-7772 Bracket Gp-Mounting

15***19	Lockwasher	4
23***56	Cover	1
23***72	Bracket Group-Mounting	1
23***06	Bracket Group-Mounting	1

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230-6052 Bracket Gp-Mounting

15***19	Lockwasher	4
23***52	Bracket Group-Mounting	1
23***53	Bracket As	1
23***56	Cover	1

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299-0293 Bracket Gp-Mounting

13***55	Setscrew; (M4x0.7x8-mm)	2
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
29***93	Bracket Group-Mounting	1
29***94	Bracket As	1

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220-9951 Bracket Gp-Mounting

15***21	Lockwasher	2
16***82	Bolt-Socket Head; (M24x3x70-mm)	10
22***51	Bracket Group-Mounting	1
22***52	Bracket As	1

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248-7982 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	10
24***82	Bracket Group-Mounting	1
24***83	Bracket As	1
5P***76	Washer Guard To Support Assembly And Guard Assembly	2

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220-8510 Grapple Gp

17***73	Pin-Spring	2
19***23	Rotator & Mtg Group-Hydraulic	1
22***10	Grapple Group	1
22***11	Housing & Shell Group-Grapple	1

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282-9847 Grapple Gp

15***21	Lockwasher	7
22***67	Pin	4
22***68	Pin	2
22***86	Pin	1

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224-0200 Grapple Gp

22***00	Grapple Group	1
22***02	Housing & Shell Group-Grapple	1
27***04	Rotator Group-Hydraulic	1

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282-9854 Grapple Gp

15***21	Lockwasher	7
22***83	Pin	1
22***84	Pin	4
22***85	Pin	2

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223-4658 Grapple Gp

22***58	Grapple Group	1
22***59	Housing & Shell Group-Grapple	1
27***04	Rotator Group-Hydraulic	1

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282-9855 Grapple Gp

15***21	Lockwasher	7
22***83	Pin	1
22***84	Pin	4
22***85	Pin	2

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220-8520 Grapple Gp

17***73	Pin-Spring	2
19***23	Rotator & Mtg Group-Hydraulic	1
22***20	Grapple Group	1
22***21	Housing & Shell Group-Grapple	1

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282-9848 Grapple Gp

15***21	Lockwasher	7
22***67	Pin	4
22***68	Pin	2
22***86	Pin	1

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341-6917 Grapple Gp

09***54	Seal; (Id=79.85mm)	16
14***78	Lockwasher	7
16***58	Bushing; (50mm)	4
22***64	Pin	4

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220-8499 Grapple Gp

17***73	Pin-Spring	2
19***23	Rotator & Mtg Group-Hydraulic	1
22***99	Grapple Group	1
22***00	Housing & Shell Group-Grapple	1

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220-8506 Grapple Gp

17***73	Pin-Spring	2
19***23	Rotator & Mtg Group-Hydraulic	1
19***24	Housing & Shell Group-Grapple	1
22***06	Grapple Group	1

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235-7934 Shell Gp-Grapple

19***19	Shell As; (Rh)	1
19***20	Shell As; (Lh)	1
22***67	Edge	1
22***05	Edge-Cutting	2

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235-7932 Shell Gp-Grapple

22***12	Shell As; (Lh)	1
22***13	Shell As; (Rh)	1
22***20	Edge	1
22***49	Edge-Cutting	2

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339-0131 Shell Gp-Grapple

24***96	Edge	2
2J***06	Nut Front Support To Frame; Nut-Front Support To Frame	24
33***29	Shell As; (Lh)	1
33***30	Shell As; (Rh)	1

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235-7935 Shell Gp-Grapple

22***70	Edge	1
22***98	Edge-Cutting	2
22***03	Shell As; (Lh)	1
22***04	Shell As; (Rh)	1

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235-7936 Shell Gp-Grapple

22***60	Shell As; (Lh)	1
22***61	Shell As; (Rh)	1
22***70	Edge	1
22***98	Edge-Cutting	2

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235-7931 Shell Gp-Grapple

22***02	Shell As; (Lh)	1
22***03	Shell As; (Rh)	1
22***20	Edge	1
22***49	Edge-Cutting	2

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235-7933 Shell Gp-Grapple

22***22	Shell As; (Lh)	1
22***23	Shell As; (Rh)	1
22***67	Edge	1
22***05	Edge-Cutting	2

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G310B serial number reference

The PIN plate on this grapple is riveted to the housing/shell (main frame) of the tool, typically near the hydraulic rotator or cylinder mounting area, and is readable without removing covers. It reads as a 3-letter prefix followed by a sequential unit number; the prefix identifies the specific build/production series of the grapple, and the digits after it identify that unit's place in the run.

Prefix	Identifies	Notes
AGK	Base/first production series for this grapple size; covers both demolition-arrangement and sorting-arrangement builds	Confirmed independently across this model's own dedicated parts-catalog entries, distinct from the separate prefixes tied to the larger 315B/320B/325B grapples in the same shared parts book.
G7K	Later production-run series for the same grapple size as AGK; likely reflects a running design change to the grapple/rotator group	confirm with dealer - found in the shared parts book's grapple/rotator listings without a sibling-model tie, but lacks the same independent double corroboration found for AGK.

Frequently asked questions

What carrier excavator size does the Caterpillar G310B fit?

The G310B is sized for host excavators in roughly the 11-17.6 tonne class, aligning with Caterpillar's 311-316 excavator range, and it runs entirely off the host's auxiliary hydraulic circuits.

What is the G310B's jaw opening and material capacity?

The G310B opens to about 1,800 mm (70.9 in) and holds a material capacity of roughly 375-400 L, with closing force rated around 36-37 kN.

What shell configurations does the G310B come in?

Caterpillar offers the G310B in a skeleton (open) shell for demolition work that lets debris fall through the jaw, and a closed shell for higher-volume material sorting.

What G310B owners discuss

What wears out first on the G310B's rotator, and how do owners spot it early?

Owners watch for a slow ooze at the swivel body or main seal well before rotation itself is affected. Since this tool has no travel motor to shield it, demolition grit gets worked past the rotator seals faster than on clean material-handling work. A light weep after break-in is normal; a steady drip, or rotation that turns notchy or hunts under light clamp load, signals the seal package or bearing race is on the way out rather than a downstream hose leak. Keeping the swivel and jaw pivots on a tight grease schedule and clearing packed debris from the housing are the most repeated ways owners stretch rotator life. Any grinding noise or binding in rotation should have your dealer verify the rotator internals before it fails completely.

What do cylinder seals and pin-and-bushing wear look like on this grapple?

The jaw cylinders are usually the first place a weeping rod seal shows up, especially on units that spend time buried in rubble where grit rides in on the rod. A faint film at the gland after break-in is normal; a wet stripe running down the rod or dripping onto the ground means the rod seal or wiper has failed and should be replaced before contaminated fluid reaches the piston seal. Jaw pivot pins and bushings loosen faster than owners expect coming from bucket-type work, because clamping and twisting against solid debris puts more side load through the pivots than digging does. A grease interval held even when the tool sits idle is what keeps that play in check; skipped greasing during storage is a common reason used units show sloppy pivots on delivery. Excess pin play at a jaw pivot is a safety item and should have your dealer verify before the tool goes back to work.

How do the wear shells and tines hold up, and how are they typically maintained?

The tine tips and the leading edge of the shells take the fastest wear since they make first contact with concrete and rebar. Most owners run them until the tips round off or start to crack rather than swapping early. Because the tines and shells are rebuildable, shops commonly build the edge back up with weld overlay for a cycle or two before replacing the shell outright, which keeps ownership cost down on a tool expected to eat abrasive material. Uneven wear side to side is usually an operator habit, such as always loading from the same angle, rather than a defect, and re-indexing or rotating the tines evens the pattern out if the shop supports it. A cracked shell or tine mount should have your dealer verify before continued heavy use, since a piece letting go under clamp load is a safety concern.

Where do hydraulic hose and fitting failures typically show up on the G310B?

Because the head rotates continuously and works close to sharp debris, the hoses routed across the rotator and down to the jaw cylinders take the most abuse: abrasion from rubbing the housing or nearby material, and fitting weep where a connection has been over-torqued or vibrated loose over time. Owners who route and clamp the hose bundle so it clears the housing through full rotation report far fewer failures than those running stock routing in heavy rubble. A fitting that keeps needing to be retightened is usually a sign the sealing surface is damaged rather than just loose, and swapping the fitting is the fix, not another turn of the wrench.

What hydraulic flow and pressure issues come up when matching this grapple to a carrier?

The most common complaint is a grapple that feels sluggish or clamps weakly, and it almost always traces back to the carrier's auxiliary circuit running under the flow or pressure the grapple needs rather than a fault in the tool itself. Pairing it with a carrier at the low end of its rated weight class, or one with a smaller auxiliary pump, shows up as slow jaw cycling and a soft grip. Running it on a carrier that overshoots the rated flow risks overheating the rotator or pushing seals past their limit. Owners who move this grapple between carriers make a habit of checking the auxiliary circuit's rated flow and pressure against the tool's requirement before hookup, and adjust relief settings only through the carrier's own controls rather than forcing the tool to compensate.

What should a buyer check before purchasing a used G310B?

Cycle the jaws fully open and closed and watch for even, synchronized movement; one side lagging points to uneven cylinder wear or a sticking valve. Spin the rotator through full rotation in both directions listening for graininess, hunting, or noise, and check for weep at the swivel housing. With the carrier shut down, rock the jaws by hand to feel for play at the pivots. Inspect the wear shells and tines for cracks, not just thickness loss, since impact cracking is as common as gradual wear on demolition duty. Ask for hour-based service history, since a low-maintenance rotator design doesn't remove the need for regular pivot greasing, and gaps in that history are the strongest predictor of expensive rotator or pin work soon after purchase. Any uncertainty about rotator internal condition or relief-valve setting should have your dealer verify before the sale closes.

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

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