JCBconstructionpowerpacks

Jcb BREAKERS

Maintenance schedule, common problems & OEM parts breakdown

The JCB Breakers range comprises hydraulic breakers designed as attachments for excavators, backhoe loaders, and compact equipment, rather than standalone machines with engines or undercarriages. The product line includes three distinct series: the Professional Breakers (HM110Q to HM496Q), the Contractor Breakers (HM012T to HM380T), and the Site Breakers (HM130 to HM2740). Operating weights range from 220 lbs (100 kg) for the HM110Q to 8,377 lbs (3,800 kg) for the HM380T. Impact energy spans from 170 J to 22,469 J. The range is compatible with carrier machines from 1 to 60 tonnes, including JCB 1CX-5CX Backhoe Loaders, JS-series Tracked Excavators, 370X Wheeled Excavators, and various mini excavators. The breakers feature solid body designs, internal control valves, and accumulators to protect the carrier machine from pressure spikes.

The JCB Breakers line has evolved to include models specifically engineered for compact 1-10 tonne carriers, expanding the range beyond heavy demolition to utility and municipal applications. The Contractor Breaker series introduced features such as auto-stop functionality to prevent blank firing, twin oval tool retaining pins for extended service life, and auto-greasing systems on models HM080T and larger. The Professional Breaker series emphasizes class-leading power-to-weight ratios and silence as standard. In the used and parts market, these attachments remain critical because they are fully approved and tested for flow, pressure, and compatibility with JCB machines, ensuring seamless integration. The availability of universal models without hanger brackets or hoses supports mixed-fleet operations, while the 3-year warranty on Contractor Breakers and 12-month warranty on Site Breakers influence residual value and replacement cycles.

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.

Jcb BREAKERS specifications

Engine

Model	Not documented for the breaker attachment itself; the breaker is a hydraulic attachment powered by the carrier machine's engine.
Gross/Net Power	Not applicable (hydraulic attachment).
Displacement	Not applicable.
Cylinders	Not applicable.
Emissions Tier	Not applicable.

Weights

Operating Weight (HM012T)	120 kg (265 lb)
Operating Weight (HM018T)	187 kg (412 lb)
Operating Weight (HM026T)	260 kg (573 lb)
Operating Weight (HM033T)	330 kg (728 lb)
Operating Weight (HM049T)	420 kg (926 lb)
Operating Weight (HM054T)	545 kg (1,202 lb)
Operating Weight (HM080T)	800 kg (1,764 lb)
Operating Weight (HM090T)	900 kg (1,984 lb)
Operating Weight (HM120T)	1,150 kg (2,535 lb)
Operating Weight (HM160T)	1,580 kg (3,483 lb)
Operating Weight (HM180T)	1,800 kg (3,968 lb)
Operating Weight (HM200T)	2,000 kg (4,409 lb)
Operating Weight (HM270T)	2,700 kg (5,952 lb)
Operating Weight (HM330T)	2,220–3,655 kg (4,894–8,058 lb) varies by configuration
Operating Weight (HM380T)	3,800 kg (8,378 lb)

Dimensions

Tool Diameter (HM380T)	175 mm (6.89 in)
Pin Diameter (HM330T Top Mount)	90 mm or 100 mm (3.5 in or 3.9 in)

Performance

Impact Energy (HM012T)	300 J
Impact Energy (HM018T)	560 J
Impact Energy (HM026T)	1,072 J
Impact Energy (HM033T)	1,393 J
Impact Energy (HM049T)	1,806 J
Impact Energy (HM054T)	2,282 J
Impact Energy (HM080T)	3,060 J
Impact Energy (HM090T)	4,110 J
Impact Energy (HM120T)	4,387 J
Impact Energy (HM160T)	6,135 J
Impact Energy (HM180T)	6,797 J
Impact Energy (HM200T)	8,444 J
Impact Energy (HM270T)	11,305 J
Impact Energy (HM330T)	8,788 J
Impact Energy (HM380T)	22,469 J (22.47 kJ)
Blow Frequency (HM380T)	3,301 blows/min
Required Oil Flow (HM380T)	272 l/min

Service capacities (summary)

Fuel Tank	Not applicable (hydraulic attachment).
Hydraulic System	Not applicable (powered by carrier).
Engine Oil	Not applicable.
Cooling System	Not applicable.

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

Jcb BREAKERS maintenance schedule

Service interval	Tasks
Every 10 h	Check fluid levels: engine oil, hydraulic tank sight gauge, coolant expansion tank, and fuel. Perform 360-degree leak walk: inspect engine bay, axles, kingpost, swing pivot, and rams for puddles or seepage. Inspect tires or tracks: check pressure and cut damage on wheeled machines; check track sag and roller condition on excavators. Examine hoses and cylinders: look for chafing, pinhole seepage, cylinder rod scoring, and fitting weep at the kingpost and boom. Check GET and bucket: inspect teeth, cutting edge, bucket pins, and quick-hitch keepers for safety.
Every 250 h	Change hydraulic filters: mandatory reduction from standard intervals when breaker use exceeds 30% of operating hours. Change hydraulic oil: required when breaker/crusher/pulveriser use period exceeds 100 hours, regardless of total machine hours. Sample hydraulic oil: check for contamination and degradation to establish baseline or detect early failure. Inspect accumulator pre-charge: verify nitrogen pressure to ensure protection against hydraulic pressure spikes. Lubricate breaker pivot points: grease all pin points on the breaker housing and mounting bracket.
Every 500 h	Change engine oil and filter: use JCB Engine Oil Special or equivalent 15W-40 diesel oil meeting API spec. Change fuel filters: replace primary and secondary filters to protect common-rail injectors on Dieselmax/EcoMAX engines. Change hydraulic return filter: inspect magnet for metallic debris before disposal. Sample all fluids: take engine, hydraulic, axle, and final drive samples to the lab for baseline analysis. Replace air filter: clean or replace primary air filter per restriction indicator. Grease all pin points: lubricate boom, arm, bucket, kingpost pivot, and stabilizer pivots.
Every 1,000 h	Replace coolant: drain, flush, and refill with JCB-spec long-life coolant. Change transmission oil and filter: service torque converter oil on backhoe loaders. Change axle oil: service front and rear axles including hubs on wheeled machines. Perform ECM diagnostic scan: use JCB ServiceMaster tool to review live and logged fault codes. Interpret hydraulic sample: compare against 500-hour baseline to extend or compress next interval. Torque slew ring bolts: critical safety check on JS-series excavators. Measure undercarriage: document wear against JCB limits on JS excavators.
Every 2,000 h	Change hydraulic oil: full drain, clean tank, and refill with JCB-spec oil. Inspect structural components: check boom, arm/dipper, loader arm, chassis, and side frames for cracking or unauthorized welding. Measure swing ring play: perform radial and axial dial-indicator check on JS-series excavators. Service brakes: inspect disc wear and immersed brake condition on backhoes and wheel loaders. Check injector spray pattern: verify via diagnostic tool and replace as required. Service cab HVAC: check A/C pressure, evaporator condition, and cabin filter.

Servicing the BREAKERS beyond the schedule

Predictive Maintenance & Fluid Analysis

When the breaker attachment is used for more than 30% of operating hours, shorten the hydraulic filter interval to every 250 hours. Change the hydraulic oil if breaker, crusher, or pulveriser use exceeds 100 hours, regardless of total machine hours. Sample hydraulic oil for contamination and degradation at these intervals. Check accumulator pre-charge pressure to ensure protection against hydraulic pressure spikes. Monitor oil samples from the carrier machine’s hydraulic system for early signs of contamination introduced by the breaker duty cycle.

Corrective & Common Repairs

Inspect the auto-stop feature on HM080T and larger models to prevent blank firing and unnecessary wear. Check twin oval tool retaining pins on heavier models for wear; rotate them to use both sides for double service life. Verify the vibro isolation rubber buffers for damage that could transmit repercussion to the carrier. Ensure the internal control valves are functioning to reduce heat build-up and protect seals. Replace moil tools or chisels when wear reduces effectiveness, using the correct Rock claw with anti-abrasion Hardox steel where specified.

Overhaul & Rebuild Points

Overhaul the hydraulic system components when oil analysis indicates severe degradation or when the 2,000-hour deep service interval is reached. Replace all seals and O-rings during hydraulic oil changes to prevent leakage. Inspect the piston and tool diameter match to maximize blow energy transfer and reduce wear. Check the gas charging kit for the accumulator and recharge as needed. Inspect the hanger bracket and mounting pins for structural integrity, especially on top-mounted and side-mounted configurations.

Seasonal & Environment Servicing

In high-temperature or dusty conditions, shorten maintenance intervals for filters and lubrication. Ensure the auto-greasing system on HM080T and larger breakers is functioning correctly to maintain lubrication throughout the working day. In cold weather, verify accumulator pressure and hydraulic fluid viscosity to ensure proper operation. Check the silence features to reduce noise pollution in urban environments. Inspect the universal model hoses and quick-hitch compatibility for mixed fleet operations in varying seasonal conditions.

BREAKERS common service parts

Part number	Part	Notes
926/26705	Filter, Fuel	Fuel system service	Check fitment →
929/27402	Filter, Air	Air intake service	Check fitment →
929/19803	Filter, Air	Air intake service	Check fitment →
926/26704	Filter, Air	Air intake service	Check fitment →
929/29813	Pipe, Return Filter	Scheduled service item	Check fitment →

Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.

BREAKERS fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
P0087	Fuel rail/system pressure too low	Clogged fuel filters, failing lift pump, or restricted fuel supply line	Check fuel filter condition and fuel pump pressure; clear code and monitor rail pressure under load
P0112	Intake air temperature sensor malfunction (low voltage error)	Short circuit to ground, damaged harness, or faulty sensor	Inspect sensor connector for corrosion and check wiring continuity; verify sensor resistance values
P0117	Engine coolant temperature sensor circuit low voltage	Coolant level low, sensor failure, or shorted wiring harness	Verify coolant level and check sensor electrical connections; replace sensor if resistance is out of spec
P0521	Engine oil pressure sensor range/performance issue	Faulty oil pressure sensor, low oil level, or wiring fault	Check oil level and condition; test sensor output voltage and inspect connector pins
P2047	DEF/AdBlue injector circuit open (SCR system fault)	Open circuit in injector wiring, faulty injector, or DEF fluid contamination	Inspect injector harness and connectors for damage; verify DEF fluid quality and level
U0100	Lost communication with Engine Control Module (ECM)	Damaged CAN bus wiring, poor ground connection, or low battery voltage	Check battery voltage and ground straps; inspect CAN bus harness for damage or corrosion
101	Low transmission clutch pressure detected	Low transmission fluid, failing pump, or internal valve body issue	Check transmission fluid level and condition; inspect hydraulic lines for leaks
203 EN TMP	EMS electrical fault: Engine Temperature sensor	Open circuit, short circuit, or faulty temperature sensor	Check sensor wiring and connector; verify sensor resistance against service manual specs
218 HYD PMP	EMS electrical fault: Hydraulic Pump sensor/circuit	Open circuit, short circuit, or faulty pressure sensor	Inspect sensor wiring and connector; verify sensor output and hydraulic pressure
300 EC1 CAN	EMS electrical fault: CAN communication error	CAN bus wiring fault, connector corrosion, or ECU communication failure	Inspect CAN bus connectors and wiring for damage; check ECU power and ground

Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.

BREAKERS attachments & work tools

Professional Breakers

HM110Q (170 J, 220 lbs) for 8008-19C; HM140Q (240 J, 280 lbs) for 15C-8026; HM166Q (252 J, 242.5-440.9 lbs) for 25Z-35Z/1CX-3CX Compact; HM266Q (376 J, 493.84 lbs) for 35Z-57C/2CX-3CX Compact/135-3TS-8T/Ret; HM386Q (600 J, 793.66 lbs) for 48Z-100C/3CX, 4CX, 5CX/150T-3TS-8T/Ret; HM496Q (855 J, 972.24 lbs) for 8052-100C/3CX, 4CX, 5CX. Features sealed-for-life accumulators, stainless steel pistons on HM496Q, and class-leading power-to-weight ratios. Supplied ready for use with hanger brackets and hoses.

Contractor Breakers

HM012T (300 J, 120 kg) for 0.5T-2T mini excavators; HM018T (560 J, 187 kg) for 1.5T-4T mini excavators/1CX; HM026T (1,072 J, 260 kg) for 3T-6.5T mini excavators/2CX/3CX; HM033T (1,393 J, 300 kg) for 4.5T-8T mini excavators/skid steer/Hydradig/Backhoe Loaders; HM049T (1,806 J, 420 kg) for 4.5T-8T/4CX/5CX; HM054T (2,282 J, 545 kg) for 6T-10T mini/midi excavators/Hydradig; HM080T (3,060 J, 800 kg) for 8T-12.5T wheeled/tracked excavators; HM090T (4,110 J, 900 kg) for 10T-15T wheeled/tracked excavators; HM120T (4,387 J, 1,150 kg) for 12T-18T wheeled/tracked excavators; HM160T (6,135 J, 1,580 kg) for 18T-24T wheeled/tracked excavators; HM180T (6,797 J, 1,800 kg) for 20T-26T wheeled/tracked excavators; HM200T (8,444 J, 2,000 kg) for 24T-30T wheeled/tracked excavators; HM270T (11,305 J, 2,700 kg) for 28T-42T wheeled/tracked excavators; HM330T (8,788 J, 4,894-8,057 lbs) for 370X tracked excavators; HM380T (22,469 J, 3,800 kg) for 40T-60T wheeled/tracked excavators. Includes auto-stop features, stroke adjusters, auto-greasing on HM080T+, and twin oval tool pins on heavier models. Available in top mount, side mount, and universal configurations.

Site Breakers

HM130 (245 J, 277.7 lbs) for 1-2T excavators; HM170 (328 J, 388 lbs) for 2-3T/3-4T excavators; HM350 (682 J, 771.6 lbs) for 4-6T excavators; HM410 (1,150 J, 1,049.4 lbs) for 8-10T excavators; HM470 (1,150 J, 967.8 lbs) for 3CX/4CX/5CX backhoe loaders; HM1000 (1,970 J, 2,279.6 lbs) for 13T excavators; HM1850 (4,243 J, 4,396 lbs) for 20T excavators; HM2740 (6,791 J, 6,613.9 lbs) for 30T excavators. Fitted with high- and low-pressure accumulators, supplied gassed and ready to go with mounting pins and hoses. 12-month warranty.

Handheld Hydraulic Breakers

D-Pick (15 kg, 6 m/s² vibration) for trenching/tunnelling; HM22 (21 kg, 3.5 m/s²) for general demolition; HM25 (26 kg, 4 m/s²) for high-output work with Beaver Powerpack; HM25LV (27 kg, 1.6 m/s²) for ultra-low vibration with Beaver Powerpack; HM29 (29 kg, 5 m/s²) for reinforced concrete/heavy roadworks; T-Pick (15 kg, 7.5 m/s²) for light-to-medium duty. Sealed hydraulic systems eliminate exhaust ports and freezing issues.

All BREAKERS assemblies by section

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

A Power Packs

A1-2-1 Engine, Beaver Mkiii

92***01	Engine, Honda, 8hp Gx240	1
92***01	Engine, Yanmar (Diesel), L70 Ae-D 7hp	1
92***01	Engine, Suzuki, V270	1
92***01	Engine, Lombardini, 15ld315	1

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A1-3-1 Engine, Trojan Mkiii

92***01	Engine, Honda, Gx390 Qx	1
92***01	Engine, Yanmar L100ae-D, Diesel	1
92***02	Filter, Air	1
92***01	Engine, Yanmar L100ae-De, Diesel	1

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A1-1-1 Engine, Compact Mkiii

92***02	Engine, Honda, 5.3hp Gx160k 1 Qx	1
92***03	Filter, Air	1

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A1-4-1 Engine, Duopower Mkiii

92***03	Key, Drive Shaft	1
92***04	Filter, Air	1
92***05	Filter, Fuel	1
92***01	Engine, Briggs & Stratton, 18 Hp	1

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A2-1-1 Chassis, Compact Mkiii

13***8Z	Bolt, M10 X 30	4
13***0Z	Bolt, M10 X 40	2
13***2Z	Bolt, Bolt; Qty Was 1 Off Before New Plate. Old Fasteners Were 13*8z X 2 & 13*2z X 1	3
13***1Z	Nut	2

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A2-3-1 Chassis, Trojan Mkiii

13***0Z	Bolt, 1/2" X 1.1/2" Long	2
13***8Z	Bolt, M10 X 30	4
13***7Z	Bolt	2
13***0Z	Bolt, M10 X 40	2

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A2-2-1 Chassis, Beaver Mkiii

13***8Z	Bolt, M10 X 30	0
13***0Z	Bolt, M10 X 40	0
13***2Z	Bolt, Bolt; Qty Was 1 Off Before New Plate. Old Fasteners Were 13*8z X 2 & 13*2z X 1	0
13***6Z	Bolt, Hex. Head, M10 X 70	0

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A2-4-1 Chassis, Duopower Mkiii

13***8Z	Bolt, M10 X 30	4
13***7Z	Bolt	2
13***2Z	Bolt	2
13***2Z	Bolt, Bolt; Qty Was 1 Off Before New Plate. Old Fasteners Were 13*8z X 2 & 13*2z X 1	6

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A3-3-1 Pump Hydraulic, Trojan Mkiii, 20 Litre

13***4Z	Screw, Grub	1
13***9Z	Capscrew, M6 X 35	4
14***18	Seal, Bonded, 1/2" Bsp	1
14***6Z	Washer, M6	4

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A3-3-2 Pump Hydraulic, Trojan Mkiii, 30 Litre

13***4Z	Screw, Grub	1
13***9Z	Capscrew, M6 X 35	4
14***18	Seal, Bonded, 1/2" Bsp	1
14***6Z	Washer, M6	4

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A3-2-2 Pump Hydraulic, Beaver Mkiii, >877032

13***4Z	Screw, Grub	0
13***09	Capscrew, M6 X 35	0
14***18	Seal, Bonded, 1/2" Bsp	0
14***6Z	Washer, Spring	0

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A3-2-1 Pump Hydraulic, Beaver Mkiii

13***4Z	Screw, Grub	0
13***09	Capscrew, M6 X 35	0
14***18	Seal, Bonded, 1/2" Bsp	0
14***6Z	Washer, Spring	0

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A3-4-1 Pump Hydraulic, Duopower Mkiii

13***4Z	Screw, Grub	1
13***9Z	Capscrew, M6 X 35	4
14***18	Seal, Bonded, 1/2" Bsp	4
14***6Z	Washer, M6	4

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A3-1-1 Pump Hydraulic, Compact Mkiii

13***4Z	Screw, Grub	1
13***09	Capscrew, M6 X 35	4
14***18	Seal, Bonded, 1/2" Bsp	1
14***6Z	Washer, Spring	4

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A4-1-1 Valve Assembly, Compact Mkiii

13***3Z	Capscrew	0
13***2Z	Capscrew, M6 X 50	0
14***15	Washer, Seal; Replaces Khj0891	2
14***18	Seal, Bonded, 1/2" Bsp	6

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A4-1-3 Valve, Manual, Compact Mkiii

13***8Z	Bolt, M8x80mm Long	0
14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
81***12	Adapter, M/F	1

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A4-1-2 Valve Relief, Compact Mkiii

13***8Z	Bolt, M8x80mm Long	0
14***18	Seal, Bonded, 1/2" Bsp	0
16***04	Adapter, Male/Female	0
92***02	Coupling, Male	0

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A4-2-1 Valve Assembly, Beaver Mkiii

13***3Z	Capscrew	0
13***2Z	Capscrew, M6 X 50	0
14***15	Washer, Seal; Replaces Khj0891	2
14***18	Seal, Bonded, 1/2" Bsp	6

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A4-4-1 Valve Assembly, Doupower Mkiii

13***07	Capscrew, M6 X 100	0
13***3Z	Capscrew	0
14***15	Washer, Seal; Replaces Khj0891	4
14***18	Seal, Bonded, 1/2" Bsp	12

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A4-3-1 Valve Assembly, Trojan Mkiii

13***3Z	Capscrew	0
13***2Z	Capscrew, M6 X 50	0
14***15	Washer, Seal; Replaces Khj0891	4
14***18	Seal, Bonded, 1/2" Bsp	4

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A5-3-1 Hoses & Pipework, Trojan Mkiii, 20 Litre

13***06	Nut	0
14***15	Washer, Seal; Replaces Khj0891	0
14***21	Seal, Bonded 3/4" Bsp	0
22***06	Clip, Jubilee	0

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A5-4-1 Hose & Pipework, Duopower Mkiii

13***2Z	Capscrew, M5 X 12	3
14***15	Washer, Seal; Replaces Khj0891	2
14***18	Seal, Bonded, 1/2" Bsp	4
14***08	Washer, 'P'	1

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A5-2-1 Hose & Pipework, Beaver Mkiii

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
14***21	Seal, Bonded 3/4" Bsp	0
22***06	Clip, Jubilee	0

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A5-3-2 Hose & Pipework, Drojan Mkiii, 30 Litre

14***15	Washer, Seal; Replaces Khj0891	1
14***21	Seal, Bonded 3/4" Bsp	1
22***06	Clip, Jubilee	6
33***87	Olive, Compression Fitting	4

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A5-1-1 Hoses & Pipework, Compact Mkiii

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
14***21	Seal, Bonded 3/4" Bsp	0
22***06	Clip, Jubilee	0

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A6-4-1 Tank, Hydraulic, Duopower Mkiii

13***0Z	Bolt	4
13***5Z	Bolt	2
13***8Z	Screw, M8x30	6
13***4Z	Screw, Grub	2

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A6-2-1 Tank, Hydraulic, Beaver Mkiii

13***0Z	Bolt	4
13***3Z	Screw, M6x16	0
13***5Z	Bolt	0
13***7Z	Screw, M6 X 25mm Long	0

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A6-3-1 Tank, Hydraulic, Trojan Mkiii

13***6Z	Bolt, 5/16"Unf X 1" Long	4
13***0Z	Bolt	4
13***6Z	Bolt	0
13***5Z	Bolt	0

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A6-1-1 Tank, Hydraulic, Compact Mkiii

13***8Z	Bolt	5
13***3Z	Screw, M6x16	0
13***5Z	Bolt	0
13***7Z	Screw, M6 X 25mm Long	0

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A7-5-1 Ram, P.O.D.

13***1Z	Nut	2
24***03	O Ring	1
33***94	Ram Cylinder (P.O.D.	1
33***85	Nut, Gland (P.O.D.)	1

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A7-3-2 Ram, Power On Demand, Trojan Mkiii, Robin Engine

14***08	Seal, Washer	1
14***15	Washer, Seal; Replaces Khj0891	1
16***01	Adapter	1
92***00	Ram, Power On Demand	1

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A7-3-1 Ram, Power On Demand, Trojan Mkiii, Honda Engine

14***08	Seal, Washer	1
14***15	Washer, Seal; Replaces Khj0891	1
16***01	Adapter	1
33***24	Bracket, P.O.D. Mounting Plat	1

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A7-2-3 Ram, Power On Demand, Beaver Mkiii, Suzuki Engine

14***15	Washer, Seal; Replaces Khj0891	1
92***00	Ram, Power On Demand	1
92***01	Stop, Spring	1
92***02	Bracket, Mounting	1

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A7-2-1 Ram, Power On Demand, Beaver Mkiii, Yanmar Engine

13***4Z	Capscrew	1
14***08	Seal, Washer	2
14***15	Washer, Seal; Replaces Khj0891	1
14***6Z	Washer, M6	1

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A7-4-1 Ram, Power On Demand, Duopower Mkiii

13***4Z	Screw, Grub	2
13***9Z	Capscrew, M6 X 35	1
14***11	Seal, Bonded	3
14***15	Washer, Seal; Replaces Khj0891	1

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A7-1-1 Ram, Power On Demand, Compact Mkiii

14***15	Washer, Seal; Replaces Khj0891	0
92***00	Ram, Power On Demand	0
92***01	Stop, Spring	1
A2***27	Pipe, Bundy	0

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A7-2-2 Ram, Power On Demand, Beaver Mkiii, Honda Engine

14***15	Washer, Seal; Replaces Khj0891	1
92***00	Ram, Power On Demand	1
92***01	Stop, Spring	1
A2***49	Pipe, Bundy	1

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A7-3-3 Ram, Power On Demand, Trojan Mkiii, Yanmar Engine

13***4Z	Capscrew	1
14***08	Seal, Washer	1
14***15	Washer, Seal; Replaces Khj0891	1
14***6Z	Washer, M6	1

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A7-2-4 Ram, Power On Demand, Beaver Mkiii, Lombardini Engine

14***08	Seal, Washer	2
14***15	Washer, Seal; Replaces Khj0891	1
16***01	Adapter	1
92***00	Ram, Power On Demand	1

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A8-1-6 Pump

13***1Z	Screw, Grub	1
13***7Z	Capscrew	4
14***18	Seal, Bonded, 1/2" Bsp	2
14***6Z	Washer, M6	4

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A8-3-1 Battery & Components, Trojan Mkiii

12***03	Tie, Cable, L=300mm X W=7.6mm	2
13***3Z	Screw, M6x16	2
13***7Z	Bolt, M10x25	2
13***4Z	Bolt, M6 X 60	2

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A8-1-3 Chassis

13***9Z	Bolt, M8 X 35mm	4
13***1Z	Capscrew	11
33***72	Front Panel	1
33***21	Cover, Tank Lid Profile	1

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A8-1-7 Valve Assembly

16***04	Adapter, Male/Male	2
33***48	Plate, Valve Support	1
58***67	Canister Filter, 25 Microns Abs Fibre	1
81***47	Valve Gasket	1

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A8-4-1 Battery & Components, Duopower Mkiii

12***03	Tie, Cable, L=300mm X W=7.6mm	2
13***3Z	Screw, M6x16	2
13***7Z	Bolt, M10x25	2
13***4Z	Bolt, M6 X 60	2

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A8-1-4 Tank, Hydraulic

30***51	Fan	1
33***83	Pump Mounting Plate	1
33***26	Connector, Air Inlet	1
33***27	Inlet Guard	1

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A8-1-5 Ram, Mounting

13***3Z	Capscrew	2
98***34	P.O.D. Ram G/A, Powerpack Power On D	1
A2***27	Pipe, Bundy	1
A2***75	Bracket, Mounting	1

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A8-1-2 Engine Assembly, Honda

01***56

Engine, Honda Gx160k1qx7, Recoil Start

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A8-1-8 Hose And Pipework

22***06	Clip, Jubilee	5
32***67	Suction Filter	1
83***21	Strainer_cooler Hose	1
83***22	Hose, Cooler/Pump	1

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A8-2-1 Battery & Components, Beaver Mkiii

12***03	Tie, Cable, L=300mm X W=7.6mm	0
13***4Z	Bolt, M6 X 60	0
13***5Z	Bolt, M6 X 35	0
13***0Z	Bolt, M10 X 40	0

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B Handheld Attachments

B1-2-1 Flexi-Handle Breaker, 22kg & 25kg

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
92***00	Breaker, Assembly, 22kg, Flexi - Handles	1
92***01	Cover, Top	0

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B1-3-4 Breaker, Sales Special 994/A0756

14***15	Washer, Seal; Replaces Khj0891	1
14***18	Seal, Bonded, 1/2" Bsp	2
24***03	O Ring	1
81***97	Label, 106 Lwa	1

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B1-3-2 Demolition Pick, Latch Nose

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
92***08	Screw, Charging	0
92***09	Seal, Washer	0

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B1-4-3 Breaker Steels, 32mm (1 1/4") Shank

99***14	Pad, Rammer	0
99***15	Tool, Moil, Tool, Moil; 380mm Long Below Collar. 160mm (6 1/4") Long Above Collar	0
99***16	Tool, Chisel, Narrow	0
99***17	Tool, Easibust	0

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B1-1-1 Standard Breaker, 20kg & 23kg

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
21***17	Pin, Tension	1
21***17	Pin, Tension	1

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B1-4-1 Breaker Steels, 22mm (7/8") Shank

PP***58	Tool, Chisel, 1 Inch (25mm) Wide	0
PP***20	Tool, Rammer Stem	0
PP***21	Tool, Tarmac Cutter 5"	0
PP***60	Spade, Clay	0

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B1-3-3 Handles, Pick, D & T

13***16	Capscrew, M8 X 70mm	2
14***7Z	Washer, Plain, M8; Replaces Khn1550, San 12620	4
92***32	Handle, 'D'	1
92***33	Handle, 'T'	2

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B1-4-2 Breaker Steels, 25mm (1") Shank

PP***11	Tool, Chisel, 22kg	0
PP***12	Tool, Asphalt Cutter, 22kg	0
PP***13	Tool, Rammer Pad Stem	0
PP***14	Pad, Rammer, 22kg	0

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B1-1-2 Standard Breaker, 26kg

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
21***17	Pin, Tension	1
21***17	Pin, Tension	1

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B1-3-1 Demolition Pick, Screw Nose

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
24***03	O Ring	1
81***97	Label, 106 Lwa	1

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B1-2-2 Flexi-Handle Breaker, 28kg

14***15	Washer, Seal; Replaces Khj0891	0
14***18	Seal, Bonded, 1/2" Bsp	0
92***02	Capscrew	4
92***05	Pivot, Handle	0

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B2-4-1 Control Valve/Hoses, Disc Cutter

13***12	Capscrew	1
14***15	Washer, Seal; Replaces Khj0891	4
14***18	Seal, Bonded, 1/2" Bsp	3
14***8Z	Washer, Spring M10; Replaces 60*8r & 6008, Replaces Luu0105-San 12222, Washer, Spring M10; Replaces 608r & 6008, Replaces Luu0105-San 12222, Used On Outlet Adapter, Item 5. Also N524275 & 5255, Washer, Spring M10; Replaces 608r & 6008, Replaces Luu0105-San 12222, Used On Outlet Adapter, Item 5. Also M524275 & 52*55	1

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B2-2-1 Chassis, Disc Cutter

13***5Z	Bolt	1
13***05	Screw	3
13***07	Capscrew, M12 X 25mm Lg.	2
92***10	Label, Ce	1

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B2-1-1 Disc Cutter

13***3Z	Capscrew	2
14***09	Washer, M12, Plain	2
14***05	Washer, 'S'	2
22***47	Circlip	1

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B2-3-1 Motor, Disc Cutter

13***2Z	Capscrew, M5 X 12	6
14***5Z	Washer, Spring, M5	6
9***1	Kit-Seal	1
A3***76	Pipe, Right Hand	1

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B3-1-1 Drill, Rotary, Percussive

13***07	Screw, Cap	0
14***15	Washer, Seal; Replaces Khj0891	0
14***7Z	Washer, Spring	0
16***07	Adapter	0

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B3-2-1 Motor & Valve, Percussive Drill

13***02	Capscrew, M5 X 12	0
14***15	Washer, Seal; Replaces Khj0891	0
14***05	Washer, 'S'	0
16***07	Adapter	0

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B3-3-1 Drill Bits, & Accessories

99***01	Bit, Drill	1
99***02	Bit, Drill	1
99***03	Bit, Drill	1
99***04	Bit, Drill	1

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B4-2-1 Pump, Submersible, 20l/Min, 2000lbf/In2, (138 Bar)

13***5Z	Bolt, Star Drive, M8 X 65mm	0
13***02	Nut	0
13***8Z	Capscrew	0
13***20	Screw, Cap, M10 X 100	0

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B4-3-1 Pump, Submersible, 30l/Min, 2000lbf/In2, (138 Bar)

13***5Z	Bolt, Star Drive, M8 X 65mm	0
13***02	Nut	0
13***8Z	Capscrew	0
13***20	Screw, Cap, M10 X 100	0

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B5-1-1 Auger, Earth

13***4Z	Screw, Grub	0
33***78	Adapter, Pin	1
33***92	Adapter, Assembly	1
92***00	Tool, Earth Auger	0

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B6-3-1 Motor, Impact Wrench

92***02	Motor, Assembly	0
92***54	Motor	0
92***55	Housing, Motor	0
92***56	Plate, Rear	0

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B6-4-1 Rear Plate, Impact Wrench

92***03	Plate, Assembly, Rear	0
92***77	Plate, Rear	0
92***78	Plug	0
92***79	O Ring	0

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B6-2-1 Mechanism, Impact Wrench

92***01	Gearbox, Impact	0
92***27	Seal, Oil	0
92***28	Housing, Front	0
92***29	Bush	0

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B6-1-1 Impact Wrench

14***15	Washer, Seal; Replaces Khj0891	0
92***00	Wrench, Impact	0
92***10	Handle, Top	0
92***11	Block, Handle Mounting	0

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B7-30-1 Breaker Steels, 28mm (1 1/8") Shank

92***56	Tool, Moil, Breaker Steel	1
92***57	Tool, Chisel Breaker Steel	1

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B7-21-1 Breaker, Hm29, 1-1/4" Shank, 30 Litre 929/92900

13***1Z	Capscrew, M5x45	4
14***15	Washer, Seal; Replaces Khj0891	1
14***18	Seal, Bonded, 1/2" Bsp	4
21***11	Pin, Tension	1

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B7-2-1 Breaker, Hm22, 1" X 4-1/4" Shank, 929/92600

13***2Z	Screw, Cap, M5 X 50mm; Replaces Aev0030, San 12455	4
13***19	Capscrew	2
14***15	Washer, Seal; Replaces Khj0891	1
14***18	Seal, Bonded, 1/2" Bsp	4

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B7-10-1 Breaker, Hm25, 1-1/4" Shank, 929/92400

13***9D	Capscrew	6
13***2Z	Screw, Cap, M5 X 50mm; Replaces Aev0030, San 12455	4
13***19	Capscrew	2
14***15	Washer, Seal; Replaces Khj0891	1

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B7-20-1 Breaker, Hm29, 1-1/4" Shank, 20 Litre 929/92700

13***2Z	Screw, Cap, M5 X 50mm; Replaces Aev0030, San 12455	4
14***15	Washer, Seal; Replaces Khj0891	1
14***18	Seal, Bonded, 1/2" Bsp	4
21***11	Pin, Tension	1

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B7-1-1 Breaker, Hm22, 7/8" X 3-1/4" Shank, 929/92500

13***2Z	Screw, Cap, M5 X 50mm; Replaces Aev0030, San 12455	4
13***19	Capscrew	2
14***15	Washer, Seal; Replaces Khj0891	1
14***18	Seal, Bonded, 1/2" Bsp	4

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B8-2-1 Power Pack, Multiflow 929/96800

01***56	Exhaust, Multi Flow	1
13***6Z	Bolt	4
13***3Z	Screw, M6x16	4
13***7Z	Screw, M6 X 25mm Long	10

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B8-1-1 Power Pack, Micro

13***3Z	Screw, M6x16	4
13***5Z	Screw, Hexagon M8 X 20mm Long	8
13***0Z	Bolt, M10 X 40	2
13***2Z	Bolt	2

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B8-3-1 Ram, Power On Demand

13***1Z	Nut	2
24***03	O Ring	1
33***94	Ram Cylinder (P.O.D.	1
33***85	Nut, Gland (P.O.D.)	1

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BREAKERS serial number reference

The machine identification plate is located on the breaker housing. Verify applicability with a JCB dealer using the carrier machine's serial number found on its identification plate.

Prefix	Identifies	Notes
HM110Q	Professional Breaker; 170 J impact energy; 220 lbs operating weight; applicable to carrier machines with serials 8008 - 19C	Verified against JCB Professional Breaker Range specifications.
HM140Q	Professional Breaker; 240 J impact energy; 280 lbs operating weight; applicable to carrier machines with serials 15C - 8026	Verified against JCB Professional Breaker Range specifications.
HM166Q	Professional Breaker; 252 J impact energy; 242.5- 440.9 lbs operating weight; applicable to carrier machines with serials 25Z - 35Z / 1CX - 3CX Compact	Verified against JCB Professional Breaker Range specifications.
HM266Q	Professional Breaker; 376 J impact energy; 493.84 lbs operating weight; applicable to carrier machines with serials 35Z - 57C / 2CX - 3CX Compact / 135 - 3TS-8T/Ret	Verified against JCB Professional Breaker Range specifications.
HM386Q	Professional Breaker; 600 J impact energy; 793.66 lbs operating weight; applicable to carrier machines with serials 48Z - 100C / 3CX, 4CX, 5CX / 150T - 3TS-8T/Ret	Verified against JCB Professional Breaker Range specifications.
HM496Q	Professional Breaker; 855 J impact energy; 972.24 lbs operating weight; applicable to carrier machines with serials 8052 - 100C / 3CX, 4CX, 5CX	Verified against JCB Professional Breaker Range specifications.

Frequently asked questions

What engine does the JCB Breakers machine use?

The JCB Breakers are hydraulic attachments and do not have their own engine. They are powered by the hydraulic system of the carrier machine, such as a JCB excavator or backhoe loader.

What is the operating weight range of the JCB Breakers?

The operating weight ranges from 220 lbs (100 kg) for the HM110Q Professional Breaker to 8,377 lbs (3,800 kg) for the HM380T Contractor Breaker.

What replaced the JCB Breakers?

The JCB Breakers line has not been replaced; it continues to be offered in three series: Professional, Contractor, and Site Breakers, with expanded compatibility for compact 1-10 tonne carriers.

What BREAKERS owners discuss

What causes frequent tripping or loss of impact power in a JCB hydraulic breaker?

Frequent tripping typically indicates low nitrogen gas pressure in the accumulator. Weak impact after warm-up suggests hydraulic fluid overheating or leaks reducing pressure. The accumulator ensures the machine is protected from hydraulic pressure spikes; if the gas charge is insufficient, the hammer cannot return for the next stroke. Recharge using high-purity nitrogen at manufacturer-specified pressure via the gas port near the accumulator. Check hydraulic oil level, quality, and inspect hoses for damage. Regular maintenance includes monitoring accumulator pressure and hydraulic system health to ensure consistent breaker performance. Have your dealer verify the accumulator pressure and hydraulic system integrity.

What are the common engine failure modes for early JCB 444 engines?

Early Dieselmax engines (Tier 2 and early Tier 3) are prone to big end bearing failures on the crankshaft. These engines have been in service for a long time now, and if oil change intervals have been stretched or oil quality has been poor, the big end bearings are usually the first thing to go. Fuel injection pump faults are also common on these earlier mechanical and early electronic engines. Worn piston rings are the most common cause of compression loss, and at that point you are looking at a rebuild rather than a repair. Unusual noises from a JCB 444 engine should never be ignored. A deep, rhythmic knocking that gets louder under load is the sound no engine owner wants to hear. Have your dealer verify the engine condition and bearing clearances.

How do JCB Contractor Breakers protect the carrier machine from damage?

Each Contractor Breaker is fitted with high- and low-pressure accumulators to prevent hydraulic pressure spikes from affecting the machine. Vibro isolation rubber buffers absorb repercussion from hammering to reduce damage to the carrier. The breakers are fully approved and tested for flow, pressure, compatibility and fitment as part of every machine development programme. Auto greasing is standard on the HM080T and larger breakers. To reduce blank firing, there’s an auto-stop feature from HM080T and above models. This prevents inexperienced operators from causing unnecessary wear and damage to the breaker. Have your dealer verify the auto-stop functionality and buffer condition.

What are the typical undercarriage or wear patterns for JCB compact excavators like the 8000-series?

The sources do not provide specific undercarriage wear patterns for the JCB 8000-series compact excavators. The sources mention that JCB 3CX and 4CX backhoe loaders have identification plates on the right-hand side of the loader tower or cab frame, and that major components each carry their own serial plate. The sources do not provide specific undercarriage wear patterns for the JCB 8000-series compact excavators.

What are the common electrical or sensor issues reported for JCB machines?

Starting problems are the single most common reason JCB owners get in touch with service providers. For JCB 3CX models, intermittent forward operation can be caused by electrical issues where the forward/reverse lever operates microswitches that activate hydraulic solenoids on the body of the transmission. Smart breakers incorporating sensors for monitoring operating parameters like blow frequency and impact force are emerging, though widespread B2B adoption is still developing. Have your dealer verify the microswitches and solenoid operation.

What fluid specifications are recommended for JCB breakers and carriers?

Only approved JCB Hammer Greases should be used. Damage to the breaker can occur if standard machine greases are used. JCB Special Hammer Grease is recommended for small and medium sized breakers, working in non-arduous conditions. It provides a highly effective lubricant on slow moving components, along with excellent corrosion resistant properties. JCB Extreme Performance Hammer Grease is a unique aluminium complex grease recommended for use on the complete range of JCB breakers. All breakers are supplied as standard with a grease gun and regular greasing is essential to protect the breaker components and minimise downtime. The sources do not provide specific hydraulic fluid specifications for the breakers themselves, but note that JCB service fluids are rigorously tested and approved for hydraulic systems.

What should be checked when buying a used JCB breaker?

Check compatibility with your specific JCB model (e.g., 3CX, 4CX) regarding mounting brackets and hydraulic connections. An oversized breaker can damage the excavator's hydraulic system, while an undersized one will be inefficient. Key specifications include operating weight, required hydraulic oil flow (l/min), working pressure (bar), and recommended carrier weight range. Check if the breaker has been regassed, as lack of gas results in no return stroke. Verify the condition of the vibro isolation rubber buffers. Ensure the auto-stop feature is functional if the model is HM080T or above. Have your dealer verify the accumulator pressure and hydraulic flow compatibility.

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

Serial-range & configuration variants

This page covers the Jcb BREAKERS. Related factory variants of the same model family:

BREAKERSBREAKERS

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