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Caterpillar G330

Maintenance schedule, common problems & OEM parts breakdown

The Cat G330 is a hydraulically powered, 360-degree rotating sorting and demolition grapple, a stick-mounted work tool and not a self-propelled machine. It has no engine, powertrain, undercarriage, or fuel and cooling system of its own; every function draws hydraulic power from the host excavator's circuit. Operating weight runs about 2.6-2.7 t (5,764-5,909 lb) and heaped capacity is roughly 1 m3 (about 1000 L / 1.31 cu yd); figures vary slightly by source and mounting hardware. Cat factory-matched the G330 to its B-series 330B L, 345B L, and 365B L excavators (roughly 33-70 tonne carrier class), with stick length setting which host it fits. It was the largest of Cat's original G315/G320/G330 sorting-and-demolition grapple lineup, sold alongside the smaller G315 and G320 for lighter carriers, from the mid-2000s B-series generation.

The G315/G320/G330 lineup was Cat's first standardized demolition and sorting grapple range built specifically for B-series excavators. Later Cat work-tool generations moved to GC-suffixed naming and broader coupler options such as Pin-on, Pin Grabber and CW-type mounts, extending grapple coverage across a wider carrier size range than the original lineup covered. No single documented model is confirmed as a direct one-for-one G330 replacement; the range simply expanded and was renamed going forward. Because the G330 predates that shift, it still matters today mainly to owners running legacy 330B, 345B, or 365B excavators: parts demand centers on wear items, tines, sideboards, pivot pins and bushings, rotator bearings, and cylinder seals, that keep an older grapple productive long after new-unit sales moved to the newer families.

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 G330 specifications

Weights

Operating weight (incl. mounting bracket)

approx. 2,620–2,680 kg (5,764–5,909 lb) — varies by catalog edition

Dimensions

Length, grapple closed	1515 mm (60 in)
Length, grapple open (jaw span)	2270 mm (89 in)
Width	1480 mm (58 in)
Height, grapple closed	1915 mm (75.4 in)
Height, grapple open	1775 mm (69.1 in)
Grapple capacity (heaped)	1000 L (approx. 1.30–1.31 yd³)
Mounting interface	Top-mount adapter bracket plate on a 360-degree slewing ring; bracket and linkage are matched to the host excavator stick/carrier

Performance

Rotation	Continuous 360 degrees, either direction, via slewing ring and rotation motor; full revolution in about 4 seconds at recommended oil flow
Jaw open/close cycle time	approx. 1.7 seconds
Closing (clamping) force	60 kN (approx. 6.7 metric tons)
Max hydraulic cylinder working pressure	35 000 kPa (5075 psi)
Max rotation drive working pressure	14 000 kPa (2030 psi)
Host carrier compatibility	Factory-matched to Cat hydraulic excavators in roughly the 30-tonne-and-up medium/large class, with stick lengths from about 3.3 m to 4.8 m (10'10" to 15'9"); linkage type and adapter bracket vary by carrier model

Service capacities (summary)

Max hydraulic cylinder oil flow	100 L/min (26.4 gpm)
Max hydraulic rotation oil flow	40 L/min (10.6 gpm)
Fuel tank / engine oil / coolant	Not applicable — the grapple has no engine, fuel tank, or onboard cooling system; all hydraulic power is supplied by the host carrier

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

G330 fluids & capacities

System	Capacity	Recommended fluid
Grapple pivot pins, bushings and rotate (slewing) bearing - grease points	Not applicable - no oil reservoir on the tool; lubrication is by grease fitting only, no fill quantity specified	Not confirmed by brand name for this specific unit in available literature. Cat work-tool lubrication charts of this era call for an NLGI 2 extreme-pressure multipurpose grease (moly-fortified) at pivot pins and the rotate bearing/pinion. Grease every fitting per the tool's own lubrication diagram at every 10 service hours (daily); confirm exact product and any cold-climate NLGI 0/1 substitution on the lubricant chart page of the grapple's O&M manual or with your Cat dealer.

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

Caterpillar G330 maintenance schedule

Service interval	Tasks
Every 10 h	Walk down the grapple before each shift: check tines, jaws and sideboards for cracks, bends or chipped wear edges. Inspect hydraulic hoses, fittings and quick-couplers for cuts, chafing or seepage from debris impact. Grease jaw pivot pins, cylinder rod-end pins and rotator zerks; wipe fittings clean first so grit isn't packed into the joint. Check cylinder rods for scoring, pitting or fresh oil weep at the seals. Confirm mounting bracket and stick-pin retaining bolts are tight and lockplates are seated. Clear packed debris and mud from the rotator housing and jaw hinge areas weekly.
Every 250 h	Grease the 360-degree rotator bearing and gear housing thoroughly, working grease fully around the race, not just at the fitting. Check rotator drive gear backlash for play beyond the tool's normal running clearance. Inspect jaw pivot bushings and pins for measurable play and log the wear trend. Torque-check mounting bracket and stick-pin retention hardware to spec. Inspect hydraulic lines routed along the stick and rotator for chafe points caused by rotation.
Every 500 h	Inspect cylinder rod seals and wiper seals for leakage; schedule a reseal on any cylinder weeping past a light oil film. Check tine and jaw wear plates for thickness against wear limits; rotate or replace before the cutting edge is lost. Inspect the rotator motor and drive coupling for abnormal noise, heat or oil seepage. Check hydraulic hose assemblies for cracking, hardening or bulging and replace any showing age damage, not just active leaks. Measure pin and bushing wear at all major pivot points and record the trend against the prior reading.
Every 1,000 h	Remove and inspect major jaw and cylinder pivot pins and bushings; replace any beyond service-limit clearance. Inspect the rotator bearing raceway and gear teeth for wear or backlash beyond factory limits; plan a rebuild if exceeded. Inspect structural welds at the frame, ribs and tine mounts for cracking, especially at high-impact demolition contact points. Check cylinder mounting pin bores for elongation or ovaling. Sample the host excavator's hydraulic oil for contamination and wear metal that grapple seal wear can introduce.
Every 2,000 h	Overhaul or replace the rotator bearing and gear assembly if wear exceeds the limit flagged at the prior inspection. Rebuild grapple cylinders showing rod wear or seal leakage: reseal and refinish or replace rods as needed. Replace major pivot pins and bushings as a matched set to restore factory clamping tolerance rather than shimming worn bores. Inspect and repair frame and rib welds; replace worn wear plates, tines and sideboards as a set to restore clamping geometry. Re-torque all mounting hardware and inspect the host coupler and pin interface for wear.
Every 4,000 h	Perform a full teardown inspection of the rotator gearbox and motor; replace bearings, seals and gear sets found worn. Send hydraulic cylinders out for professional reseal, rod refinishing or rechroming if not already done at an earlier interval. Replace tines, sideboards and wear plates as a complete matched set to restore original capacity and jaw geometry. Inspect the frame casting and weldment for cumulative fatigue cracking from repeated demolition impact cycles and repair or reinforce as needed.

Servicing the G330 beyond the schedule

Predictive Maintenance & Fluid Analysis

The G330 has no engine or reservoir of its own, so predictive care means tracking wear trends on the tool and watching the host excavator's hydraulic oil. Log rotator-bearing backlash, cylinder rod-seal weep, and pivot-pin play at every interval so a trend shows before a joint fails mid-cycle. Sample the carrier's hydraulic oil regularly; grapple seal wear shows up there as rising particulate or metal count before a hose or cylinder visibly leaks. Rising rotator-motor temperature is an early bearing-wear signal worth logging over time.

Corrective & Common Repairs

Common G330 repairs center on the jaw and rotation system. Chipped or bent tines and sideboards from demolition debris need straightening, weld buildup, or replacement to hold clamping geometry. Cylinder rod seals weep after repeated abrasive-dust exposure and need reseal or rod refinishing. Pivot pins and bushings at the jaw hinges wear oval under constant crushing loads and should be replaced in matched sets, not one at a time. Hydraulic hoses routed near the rotator get cut or abraded by scrap and demolition debris and need frequent replacement.

Overhaul & Rebuild Points

A full G330 overhaul centers on the rotator and the jaw structure. Rebuild the rotator gear and bearing assembly once backlash or play exceeds service limits; this is the tool's main wear-out point under heavy sorting duty. Reseal or rechrome grapple cylinders showing scored rods or persistent weep. Replace all major pivot pins and bushings as a matched set to restore factory clamping tolerance rather than shimming worn bores. Inspect the frame and rib welds around the tine mounts for demolition-fatigue cracking and repair before returning the tool to service.

Seasonal & Environment Servicing

Abrasive demolition and scrap debris packs grit into grease fittings and pivot joints faster than normal duty; clean joints before greasing so grit isn't driven into the bushing instead of flushed out. In cold climates, let the host excavator warm its hydraulic oil before cycling the grapple hard, since stiff, cold oil accelerates seal and hose wear at the rotator and cylinders. Wet scrapyard or demolition-site conditions accelerate corrosion at pins, bushings, and exposed rod surfaces, so wipe down and re-grease more often than the standard interval calls for.

G330 attachments & work tools

Host Carrier Compatibility

Factory-matched to the Cat 330B L, 345B L, and 365B L excavators, a mid-to-large class spanning roughly 33 tonnes up into the high-60-tonne range depending on host. Stick reach windows run from about 2.7-3.9 m on the 330B L/345B L up to 2.8-4.7 m on the 365B L, varying by boom and undercarriage configuration.

Mounting Bracket / Linkage Interface

Attaches through a dedicated top-mounting adapter plate bolted to the excavator stick end rather than a universal quick-coupler; each host uses its own matched linkage set (identified by Cat's own linkage lettering, differing per host model). Mounting bracket weight is bundled into the quoted grapple weight of roughly 2.6-2.7 t (about 5,900 lb), figure varies slightly by source.

Rotator / Swivel System

Continuous 360-degree hydraulic rotation runs through a slewing-ring bearing and a dedicated rotation motor, independent from the clamp circuit. At rated flow, about 40 L/min (10.6 gpm) up to roughly 14,000 kPa (2,030 psi), the tool turns a full revolution in about 4 seconds with instant start-stop control for sorting placement.

Jaw / Tine Configuration

Opposed jaws are built as vertical rib and tine bars reinforced by horizontal welded steel bars, an open rake-style grapple rather than a solid shell. Rated capacity is about 1.0 cubic meter (1.3 cu yd) with an open jaw spread near 2.27 m (89 in) and a fast open/close cycle suited to feeding conveyors or hand-sorting debris.

Sideboard / Wear-Edge Options

Bolt-on side plates are offered to close the rib cage for finer sorting or smaller-size material, an option beyond the standard open-tine jaw. Cutting edges use abrasion-resistant plate with bolt-on wear strips that can be reversed to extend edge life before replacement.

Hydraulic Kit / Circuit Requirements

Clamp (open/close) flow runs up to about 100 L/min (26.4 gpm) at up to 35,000 kPa (5,075 psi), while the rotation line runs separately at around 40 L/min (10.6 gpm) up to about 14,000 kPa (2,030 psi). The host excavator needs an auxiliary work-tool hydraulic kit and controls sized for both circuits, not just a single clamp line.

Factory Arrangement / Guarding

Sold as its own catalogued housing and linkage arrangement with a dedicated parts and service reference tied to a specific serial-number range, not a generic aftermarket fitment. A falling-object guard for the host cab is recommended wherever overhead debris is a risk; it is a separate dealer-sourced option, not standard equipment on the grapple.

Family / Size-Class Context

G330 is the largest of the original sorting-and-demolition grapple trio built for stick-mounted excavator use, sized for the biggest host in that lineup. It predates and is distinct from Cat's later material-handler grapple range (which runs a different model spread and uses pin-grabber and dedicated hydraulic couplers) — do not blend specs or coupler details across the two families.

All G330 assemblies by section

Every catalogued assembly group for the Caterpillar G330. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

174-1657 Housing Gp-Grapple

09***48	Nipple, Grease	8
12***81	Bolt-Socket Head; (M10x1.5x55-mm)	2
14***78	Lockwasher	4
15***38	Tee As	1

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174-7842 Housing Gp-Grapple

09***48	Nipple, Grease	8
12***81	Bolt-Socket Head; (M10x1.5x55-mm)	2
14***78	Lockwasher	4
15***38	Tee As	1

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193-5353 Housing Gp-Grapple

09***48	Nipple, Grease	8
12***81	Bolt-Socket Head; (M10x1.5x55-mm)	2
14***78	Lockwasher	4
15***38	Tee As	1

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193-5358 Housing Gp-Grapple

09***48	Nipple, Grease	8
12***81	Bolt-Socket Head; (M10x1.5x55-mm)	2
14***78	Lockwasher	4
15***38	Tee As	1

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193-5362 Housing Gp-Grapple

09***48	Nipple, Grease	8
12***81	Bolt-Socket Head; (M10x1.5x55-mm)	2
14***78	Lockwasher	4
15***18	Lockwasher	13

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174-9093 Housing Gp-Grapple

09***48	Nipple, Grease	8
12***81	Bolt-Socket Head; (M10x1.5x55-mm)	2
14***78	Lockwasher	4
15***38	Tee As	1

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187-4371 Sideboard Gp-Grapple

15***22	Lockwasher	12
17***40	Screw-Flat Head; (M24x3x90mm)	12
18***69	Plate As-Rh	2
18***71	Sideboard Group-Grapple	1

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187-4372 Sideboard Gp-Grapple

15***22	Lockwasher	12
17***40	Screw-Flat Head; (M24x3x90mm)	12
18***70	Plate As-Rh	2
18***72	Sideboard Group-Grapple	1

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Hydraulic System

174-1679 Cylinder Gp-Hydraulic

09***48	Nipple, Grease	2
12***09	Bearing	2
17***79	Cylinder Group-Hydraulic	1
17***68	Cylinder As	1

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177-5021 Lines Gp-Connecting

12***40	Fitting As-Hydraulic; (Quick Disconnect, Male)	2
17***21	Lines Group-Connecting	1
17***22	Hose As	2
6V***98	Seal-O-Ring -Line From Gear Pump Output	4

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177-5024 Lines Gp-Connecting

17***20	Hose As	2
17***24	Lines Group-Connecting	1
1P***04	Seal - Rectangular (45mm Dia)	1
1P***67	Flange-Half (43.31 mm Id)	2

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177-5023 Lines Gp-Connecting

17***20	Hose As	2
17***23	Lines Group-Connecting	1
1P***04	Seal - Rectangular (45mm Dia)	2
1P***67	Flange-Half (43.31 mm Id)	4

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177-5046 Lines Gp-Connecting

17***20	Hose As	2
17***46	Lines Group-Connecting	1
5K***90	Seal-To Hydraulic Cooler Inlet Port	2
6V***48	Reducer Assembly	2

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228-9797 Lines Gp-Connecting

11***49	Fitting; (Quick Disconnect, Male)	2
1P***02	Seal-Rectangular 28.83mm(1.136in) Id	2
22***97	Lines Group-Connecting	1
22***19	Hose As	2

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229-4905 Lines Gp-Connecting

11***49	Fitting; (Quick Disconnect, Male)	2
1P***04	Seal - Rectangular (45mm Dia)	2
1P***67	Flange-Half (43.31 mm Id)	4
22***05	Lines Group-Connecting	1

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177-5019 Lines Gp-Connecting

17***19	Lines Group-Connecting	1
17***20	Hose As	2
7K***81	Strap-Pressure & Return Hoses To	4

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177-5129 Lines Gp-Connecting

12***40	Fitting As-Hydraulic; (Quick Disconnect, Male)	2
17***29	Lines Group-Connecting	1
17***45	Hose As	2
6V***98	Seal-O-Ring -Line From Gear Pump Output	4

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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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170-2172 Motor & Manifold Gp-Rotator

17***72	Motor & Manifold Group-Rotator	1
17***73	Motor Group-Gerotor	1
17***74	Manifold Group-Control	1
17***76	Ring-Mounting	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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169-6060 Rotator Gp-Hydraulic

03***43	Seal-O-Ring	1
08***09	Spacer; (16.6x32x8.5-mm Thk)	34
12***28	Adaptor - Includes:-	2
15***94	Adapter As	6

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171-7526 Rotator Gp-Hydraulic

03***43	Seal-O-Ring	1
09***48	Nipple, Grease	1
14***70	Elbow, 90°,-8 Orb Swiv. /-8 Orfs	2
15***94	Adapter As	6

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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

174-7864 Plate & Film Gp

14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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204-4263 Plate & Film Gp

14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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174-1656 Plate & Film Gp

14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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204-4257 Plate & Film Gp

14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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204-4260 Plate & Film Gp

14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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174-9092 Plate & Film Gp

14***36	Film-Warning; (Flying Debris)	2
14***69	Film-Warning; (Alert)	2
14***70	Film-Warning; (Read Omm)	2
15***35	Film-Warning; (Crush Hazard, Stay Back)	2

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Work Tool Arrangement

174-7841 Grapple Ar-Hydraulic

14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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193-5352 Grapple Ar-Hydraulic

14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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193-5361 Grapple Ar-Hydraulic

14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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174-9091 Grapple Ar-Hydraulic

14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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174-1655 Grapple Ar-Hydraulic

14***08	Fitting	2
14***86	Fitting As	2
15***44	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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193-5357 Grapple Ar-Hydraulic

14***74	Fitting As	2
14***86	Fitting As	2
15***44	Seal	1
17***77	Fitting As; (Quick Disconnect, Male)	4

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Work Tools

169-4971 Bracket Gp-Mounting

16***71	Bracket Group-Mounting	1
16***91	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
7X***53	Bolt-Plt; (M16 X 2.0 X 40)	2

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169-4969 Bracket Gp-Mounting

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

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175-0342 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	14
17***42	Bracket Group-Mounting	1
17***49	Bracket As	1
7X***52	Bolt-Plt; (M16 X 2.0 X 30)	2

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179-1647 Bracket Gp-Mounting

15***18	Lockwasher	8
16***19	Bracket As	1
16***97	Plate-Cover	1
17***47	Bracket Group-Mounting	1

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169-5308 Bracket Gp-Mounting

16***08	Bracket Group-Mounting	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
17***45	Bracket Group-Mounting	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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175-0338 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	14
17***38	Bracket Group-Mounting	1
17***46	Bracket Group-Mounting	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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169-4976 Bracket Gp-Mounting

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

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169-4974 Bracket Gp-Mounting

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

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169-4975 Bracket Gp-Mounting

13***55	Setscrew; (M4x0.7x8-mm)	2
16***75	Bracket Group-Mounting	1
16***94	Bracket As	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14

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190-5435 Bracket Gp-Mounting

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

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175-0341 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	14
17***41	Bracket Group-Mounting	1
17***48	Bracket As	1
7X***52	Bolt-Plt; (M16 X 2.0 X 30)	2

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169-4981 Bracket Gp-Mounting

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

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169-4980 Bracket Gp-Mounting

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

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254-4039 Bracket Gp-Mounting

09***49	Washer; (22x60x6-mm Thk)	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
20***71	Washer; (26x90x8-mm Thk)	1
25***39	Bracket Group-Mounting	1

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169-5312 Bracket Gp-Mounting

16***12	Bracket Group-Mounting	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
17***54	Bracket Group-Mounting	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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179-1654 Bracket Gp-Mounting

15***18	Lockwasher	8
16***15	Bracket As	1
16***97	Plate-Cover	1
17***54	Bracket Group-Mounting	1

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179-1646 Bracket Gp-Mounting

15***18	Lockwasher	8
16***97	Plate-Cover	1
17***45	Bracket As	1
17***46	Bracket Group-Mounting	1

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169-5311 Bracket Gp-Mounting

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

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169-4978 Bracket Gp-Mounting

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

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169-4968 Bracket Gp-Mounting

16***68	Bracket Group-Mounting	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
23***05	Bracket As	1
7Y***10	Washer-Special; (17x65x6-mm Thk)	2

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179-1645 Bracket Gp-Mounting

15***18	Lockwasher	8
16***18	Bracket As	1
16***97	Plate-Cover	1
17***45	Bracket Group-Mounting	1

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201-9466 Bracket Gp-Mounting

15***18	Lockwasher	8
16***97	Plate-Cover	1
20***66	Bracket Group-Mounting	1
20***31	Bracket As	1

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169-5307 Bracket Gp-Mounting

16***07	Bracket Group-Mounting	1
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
17***47	Bracket Group-Mounting	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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193-4497 Bracket Gp-Mounting

16***82	Bolt-Socket Head; (M24x3x70-mm)	14
19***97	Bracket Group-Mounting	1
20***66	Bracket Group-Mounting	1
8T***67	Washer-Hard; (26x44x4-mm Thk)	14

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209-1776 Bracket Gp-Mounting

13***55	Setscrew; (M4x0.7x8-mm)	2
16***82	Bolt-Socket Head; (M24x3x70-mm)	14
20***59	Plate-Serial Number	1
20***76	Bracket Group-Mounting	1

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169-4970 Bracket Gp-Mounting

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

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174-7845 Edge Gp-Cutting

17***45	Edge Group-Cutting	1
18***48	Edge-Cutting	2
2J***05	Nut Rim To Adapter And Adapter To Wheel	24
2J***06	Nut Front Support To Frame; Nut-Front Support To Frame	18

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174-5567 Edge Gp-Cutting

17***67	Edge Group-Cutting	1
2J***06	Nut Front Support To Frame; Nut-Front Support To Frame	14
5J***73	Bolt 2.06cm(.8125in.)Long	14
7T***91	Sole	2

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174-9098 Edge Gp-Cutting

17***98	Edge Group-Cutting	1
18***49	Edge-Cutting	2
2J***06	Nut Front Support To Frame; Nut-Front Support To Frame	18
5J***71	Bolt-Plow; (3/4-10x2.75-In)	18

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193-7174 Grapple Gp

16***60	Rotator Group-Hydraulic	1
19***53	Housing Group-Grapple	1
19***74	Grapple Group	1

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193-7178 Grapple Gp

17***26	Rotator Group-Hydraulic	1
19***58	Housing Group-Grapple	1
19***78	Grapple Group	1

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179-3481 Grapple Gp

17***26	Rotator Group-Hydraulic	1
17***93	Housing Group-Grapple	1
17***81	Grapple Group	1

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179-3477 Grapple Gp

16***60	Rotator Group-Hydraulic	1
17***57	Housing Group-Grapple	1
17***77	Grapple Group	1

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193-7176 Grapple Gp

16***60	Rotator Group-Hydraulic	1
19***62	Housing Group-Grapple	1
19***76	Grapple Group	1

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179-3479 Grapple Gp

16***60	Rotator Group-Hydraulic	1
17***42	Housing Group-Grapple	1
17***79	Grapple Group	1

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G330 serial number reference

The G330 is a bare hydraulic attachment, so its serial plate is riveted to the grapple housing or frame casting near the mounting-bracket pivot rather than on an engine block. The three letters are the factory build prefix for this specific grapple model, and the digits that follow are the sequential unit number within that build. Unlike self-propelled machines, there is no year-by-prefix decoder for this work tool - the prefix only tells you which casting/rotator configuration run the housing belongs to, so match it against the parts book or a dealer SIS lookup for an exact build date.

Prefix	Identifies	Notes
AMT1-UP	G330 demolition/sorting grapple build (housing and grapple-arm castings)	Factory housing/grapple-arm build tied specifically to the G330 sorting-and-demolition grapple, matched to the 330B L/345B L/365B L excavator family. The G330 is documented alongside the G315 and G320 in one combined factory parts book, but each of the three grapples has its own distinct serial prefix inside that book - this is the G330's own range, not shared with its siblings. No public year-by-prefix decoder exists for this attachment; confirm exact build date against a dealer SIS lookup if precision matters.

Frequently asked questions

What engine does the Cat G330 use?

None. The G330 is a hydraulically powered attachment, not a self-propelled machine; it has no engine, fuel system, or cooling system of its own. It runs entirely on hydraulic flow supplied by its host excavator (330B L, 345B L, or 365B L class), which powers the grapple's cylinders and 360-degree rotator.

What is the G330's operating weight?

About 2.6-2.7 t (5,764-5,909 lb), depending on the source and exact mounting hardware used. It's the heaviest tool in Cat's original G315/G320/G330 sorting-and-demolition grapple lineup.

What replaced the Cat G330?

No single documented model is confirmed as a direct replacement. Cat's demolition and sorting grapple range later moved to GC-suffixed models and broader coupler options (Pin-on, Pin Grabber, CW-type) covering a wider span of carrier sizes than the original G315/G320/G330 lineup. If you're sourcing parts for a working G330 today, plan around the legacy B-series excavator fleet it was built for.

What G330 owners discuss

Why does the G330 sometimes feel jerky or hesitant when rotating or closing the jaws?

On the G330 and the rest of Cat's demolition and sorting grapple line, the rotate, swivel, and open/close functions run on separate hydraulic paths so one motion does not rob flow from another. Jerky or hesitant rotation, or a jaw that snaps shut instead of closing smoothly, is almost always a flow or pressure mismatch between the carrier's auxiliary circuit and the grapple's rated circuit rather than a fault inside the grapple. Field technicians typically check the carrier's auxiliary relief and flow-control settings against the grapple's rated pressure and flow before condemning the grapple's valve or rotator motor.

What wear patterns show up at the jaw pivot pins and cylinder rod-end pins?

The jaw pivot pins, cylinder rod-end pins, and their bushings take the brunt of wear on this class of grapple, especially when the jaws are used to twist or pry material apart instead of simply closing on it. Expect measurable bushing wear and pin scoring well before the structural steel shows any distress, and it usually shows up first as side-to-side slop in the jaw or a knocking sound on direction changes. Keeping every pivot point greased on schedule and not letting pins run dry is the biggest factor separating a grapple that stays tight from one that gets sloppy early. Because worn pins and bushings affect how securely the jaw holds a suspended load, have your dealer verify pin and bushing wear against factory tolerance before returning the tool to service.

Where do hydraulic leaks typically start on a grapple like the G330?

Leaks tend to show up first at the rotation swivel joint on top of the tool, at the hose-to-carrier quick-coupler faces, and at the jaw cylinder rod seals. The swivel joint takes constant rotational stress on its seals, and coupler leaks are more often traced to worn O-rings or couplers connected under residual pressure or with dirty faces than to a defective grapple component. A weep that starts as a stain and turns into a steady drip means seal replacement is close, not optional. Because a hose or coupler failure under pressure can whip or spray hot oil, have your dealer verify any active leak before the attachment goes back to work.

How much tine and sideboard wear is normal, and when does it need attention?

Tine tips and sideboard wear plates are the sacrificial parts of a sorting or demolition grapple and are expected to wear down with regular use, especially in scrap or concrete work. Once a tine wears toward its base material, the usual fix is building it back up with hardfacing weld or cutting in a new wear plate rather than swapping the whole jaw structure. Sideboards and wear bars around the jaw opening should be checked for material loss the same way, since thinning steel there changes how the jaw grips irregular material. Rebuilding is a shop job with welding time, not a bolt-on swap, so budget accordingly once tines start looking thin.

Does the G330 perform differently depending on which excavator it's mounted to?

The G330 is sized for carriers in the 330B L through 365B L class, and getting good performance depends as much on the carrier's auxiliary hydraulic setup as on the grapple itself. Running it on a carrier with auxiliary flow or relief pressure set above the tool's rated circuit tends to show up as overly aggressive jaw slam, rotation that overshoots, and faster seal and bearing wear. The independent rotate/swivel/open-close circuit design only protects the tool if the carrier-side flow and pressure are actually matched to the grapple's rating. Moving a G330 between host machines, confirm the auxiliary circuit is set within the grapple's rated range before putting it back to work.

What's a common long-term issue with the rotator itself?

A common wear pattern on hydraulic rotators in this class is gradual bearing play and gear backlash in the rotate drive, showing up as the jaw head rocking slightly at the top of the tool or a grinding or knocking noise when rotation reverses under load. Wear accelerates when the grapple is used to twist a heavy or awkward load into position instead of repositioning the carrier, since that loads a bearing designed mainly for rotational torque with unwanted side load. Grease routed through the rotator's slip-ring path needs to stay current, since a rotation bearing run dry wears noticeably faster than one kept on schedule.

What should I check before buying a used G330?

Cycle the jaws and rotation fully and watch for hesitation, then grab the jaw head and check for play at the pivot pins, cylinder rod-end pins, and rotator bearing. Look for oil staining or active weep at the rotation swivel joint, cylinder rod seals, and hose/coupler connections, and check tine and sideboard wear against how much base material is left. Confirm the grapple's coupler pattern and rated flow and pressure match the buyer's carrier, since a mismatch produces the same jerky, hard-slamming behavior operators complain about even on a mechanically sound tool. Check the mounting ears and pin bosses for cracks or repair welds, since that's where a hard-working demolition tool shows fatigue first, and have your dealer verify any structural weld repair or excessive pin and bushing slop before putting the attachment into service.

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

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