Caterpillarwork toolbackhoe

Caterpillar BH27

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar BH27 is a passive hydraulic backhoe work tool, not a standalone machine - it carries no engine, no ECM, and no fluid systems of its own, drawing all hydraulic power from a host carrier's auxiliary circuit. Operating weight runs around 700 kg (1,543 lb), with a digging depth of 2585 mm (101.8 in, about 8.5 ft) and a reach of 3486 mm (137.2 in) from the swing pivot, delivering roughly 3970 kg (8,753 lb) of bucket breakout force on a minimum 30 L/min at about 170 bar hydraulic supply. It mounts to Cat's small-frame skid steer and multi-terrain loader lineup - 216B, 226B, 226B HF, 232B, 242B, 242B HF, 247B, 257B, and 257B HF class carriers - through a dedicated rear subframe rather than the loader's front quick-attach plate. BH27 ran as a single production configuration under serial prefix B2H, with no lettered successor of its own; Cat eventually folded the whole small-attachment backhoe concept into the later BH150/BH160 series.

BH27 sits at the narrow, short-reach end of a shared attachment family: it shares its coupler, cylinder, and pivot architecture, and its service documentation, with the longer-reach BH30 (3 m reach, same narrow mounting frame) and the wider BH30W (3 m reach, wide frame), essentially the same design scaled up rather than redesigned. No mid-life spec change or lettered revision touched BH27 itself before Cat retired the whole B2H/B3H/B3W lineup in favor of the current BH150/BH160 backhoe-for-skid-steer series. In today's used and parts market, BH27 remains relevant mainly to owners of aging 216B-257B class skid steers and multi-terrain loaders who want rear-digging capability without buying a dedicated excavator; because it has no engine or electronics to fail, resale value and usable life hinge almost entirely on pin/bushing condition, cylinder seal integrity, and structural weld condition at the boom-to-swing-tower junction, with replacement parts sourced through the shared BH30/BH30W documentation rather than a standalone BH27 catalog.

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 BH27 specifications

Engine

None. BH27 is a passive backhoe work tool with no onboard engine or ECM. It draws all power from the host skid steer / multi-terrain loader's hydraulic system, so no displacement, cylinder count, power rating, or emissions tier applies.

Weights

Operating weight	approx. 700 kg (1,543 lb) base unit; individual used units with buckets/options fitted have been recorded up to approx. 785 kg (1,731 lb) - varies by bucket and option fitment
Shipping weight	not separately published

Dimensions

Overall operating height	3472 mm (136.7 in)
Digging depth	2585 mm (101.8 in)
Reach from swing pivot at ground	3486 mm (137.2 in)
Dump height	2197 mm (86.5 in)
Boom pivot height	474 mm (18.7 in)
Transport height	2250 mm (88.6 in)
Total side-shift travel	850 mm (33.5 in)

Performance

Bucket breakout force	3970 kg (8,753 lb)
Swing arc	180 degrees
Bucket swing / rotation	210 degrees
Hydraulic operating pressure	170 bar (2,466 psi) on most listings; one source cites 140 bar - varies by carrier machine hydraulic setting
Minimum hydraulic flow	30 L/min (7.9 US gpm) minimum; working range cited as 20-50 L/min (5.3-13.2 US gpm) depending on the host loader's auxiliary hydraulic output

Service capacities (summary)

Fuel tank / engine oil / coolant

Not applicable. BH27 has no engine and no dedicated fuel, engine-oil, or cooling-system reservoirs. It runs entirely off the carrier machine's hydraulic tank and pump.

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

BH27 fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase, cooling system, fuel tank, transmission/final drives, hydraulic tank/reservoir	Not applicable - BH27 has none of these systems	The BH27 is a passive hydraulic backhoe work tool for Cat skid steer loaders, multi-terrain loaders, and compact track loader carriers (serial prefix B2H, sibling to BH30/BH30W). It carries no engine, no cooling system, no fuel tank, and no transmission or final drives of its own. Boom, stick, bucket, and swing-frame cylinders run on hydraulic oil supplied by the carrier machine's own hydraulic pump and reservoir through the quick-coupler circuit; the attachment itself has no reservoir or fill capacity to specify.
Pivot-pin and bushing lubrication (boom pin, stick pin, bucket linkage pins, cylinder pins, swing-frame pivots, sideshift pins)	No fill quantity - grease is applied at fittings until purged, not held in a reservoir	General-purpose or moly-fortified extreme-pressure grease, NLGI grade 2, per Cat's standard backhoe pin/bushing lubrication guidance. No BH27-specific grease brand callout could be confirmed in available documentation; treat as the same grease used across Cat's skid-steer backhoe attachment line. No published viscosity-by-climate split applies since this is a single all-season NLGI 2 chassis grease, not a crankcase or hydraulic fluid.

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

Caterpillar BH27 maintenance schedule

Service interval	Tasks
Every 10 h	Grease every pivot fitting - boom pivot, dipper/stick pin, bucket linkage pins, cylinder pins, swing-frame and sideshift pins - until clean grease purges at each point. Inspect hydraulic hoses, quick-coupler fittings, and O-ring face seal joints for weeping, chafing, or loose connections before starting work. Cycle boom, stick, bucket, and swing through full range and check for binding, unusual noise, or delayed response. Check the bucket coupler wedge and lock pin for full seating and engagement. Wipe down pin bosses on the mainframe and boom and look for fresh grinding marks or paint that could be hiding a crack repair.
Every 250 h	Rock the bucket at full extension with the carrier engine off and load released; check pin-to-bushing clearance at the boom, stick, and bucket linkage pivots. Check swing-tower pins and bushings for side play under light load. Torque-check the mounting subframe bolts that secure BH27 to the carrier frame. Inspect boom, stick, and bucket cylinder rods for pitting, scoring, or seal weeping. Confirm the carrier's auxiliary hydraulic circuit still delivers BH27's minimum 30 L/min at approximately 170 bar.
Every 500 h	Measure bucket linkage pin and bushing wear; replace any bushing before wear reaches the pin boss. Raise a loaded bucket and watch each cylinder for rod drift/creep; flag fast drift for holding-valve and seal service. Inspect the boom-to-swing-tower junction and stabilizer arm mounts for hairline cracks, especially on units that have seen hammer or breaker duty. Inspect and reseat or replace worn O-ring face seal hydraulic couplings. Verify the sideshift frame travels smoothly across its full 850 mm range without binding.
Every 1,000 h	Pull and inspect the boom, stick, bucket, and swing pivot pins for out-of-round wear; replace pins and bushings as a matched set where clearance exceeds service limit. Pressure-test boom, stick, and bucket cylinders for internal bypass and external leakage. Inspect swing cylinder pin connections for backlash contributing to swing-arc side play. Re-torque all mounting subframe and stabilizer hardware to spec. Inspect the quick-coupler wedge/lock mechanism for wear and confirm the coupler pattern still matches the carrier.
Every 2,000 h	Disassemble the swing-frame and mainframe pivot joints for full wear-limit inspection; renew any bushing or pin showing measurable ovality. Pull a hydraulic oil sample from the carrier's reservoir for analysis if BH27 has carried most of the machine's duty cycle, since contamination shows up first as accelerated pin and cylinder wear. Inspect mainframe and boom castings around the pin bosses for stress cracking with dye penetrant or a close flashlight check. Overhaul or replace the cylinder seal kits on boom, stick, and bucket cylinders as a set. Confirm structural welds at the boom-to-swing-tower junction and stabilizer mounts show no repair history or fatigue cracking.
Every 3,000 h	Perform a full teardown of the boom, stick, bucket, and swing assemblies; replace all pins and bushings regardless of measured wear before returning the unit to heavy production duty. Replace all hydraulic cylinder seal kits and check cylinder barrels and rods for wear beyond honing limits, sleeving or replacing cylinders as needed. Replace worn quick-coupler wedge and lock components as a matched set. Clean and repaint mainframe and boom castings to expose any hidden crack repairs before returning to service. Reconfirm carrier compatibility and hydraulic circuit match if the attachment is being transferred to a different host machine.

Servicing the BH27 beyond the schedule

Predictive Maintenance & Fluid Analysis

BH27 has no engine oil or coolant to sample - its hydraulic circuit borrows the carrier's reservoir entirely, so predictive care means tracking wear trend, not fluid chemistry. Log pin-to-bushing clearance at the boom, stick, and swing-tower pivots at each service interval and chart the rate of change; a bushing wearing faster than expected signals contaminated shared hydraulic oil or a grease interval that's running too long. Watch cylinder rod drift under a raised, loaded bucket - creep that shortens between checks points toward a failing holding valve before it becomes a hard failure.

Corrective & Common Repairs

Most BH27 repairs trace to worn pins and bushings at the boom, dipper, and swing-tower pivots, or to seal-worn boom, stick, and bucket cylinders that drift under load. Replace bushings before wear reaches the pin boss on the mainframe casting - reboring an oval pin bore costs far more than a bushing swap. Sluggish curl or swing is rarely the tool's own fault; confirm the carrier's auxiliary circuit actually delivers BH27's rated 30 L/min at 170 bar before chasing a cylinder or valve. Coupler wedge and lock wear is common on units run through frequent bucket changes.

Overhaul & Rebuild Points

A BH27 overhaul centers on the mainframe and swing-frame pivot joints: pull all pins, measure bore wear, and renew bushings as a matched set rather than fitting new pins into worn bores. Reseal the boom, stick, and bucket cylinders together, since one worn seal usually means its neighbors are close behind on similar duty hours. Inspect the boom-to-swing-tower junction and stabilizer arm mounts closely for hairline cracks or prior repair welds hidden under fresh paint - these carry the highest cyclic stress on the attachment and are its most common structural failure point.

Seasonal & Environment Servicing

Cut grease intervals in half on BH27 units working wet ground, mud, or standing outside between jobs - moisture displaces grease at the pivot fittings faster than the standard schedule assumes. Before cold-weather work starts, purge grease fully at every fitting, since old grease stiffens and stops migrating into the bushing at low temperatures. In storage, rest the bucket on the ground or support the boom so cylinders stay retracted and seals unloaded, and cap the quick-coupler face to keep grit out of the wedge and lock. Hammer or breaker duty ages swing pins faster than digging in any season.

BH27 attachments & work tools

Digging buckets

The BH27 accepts pin-on digging buckets sized for its roughly 700 kg mini-backhoe class, generally in the 300-600 mm (12-24 in) width range for general excavation, with narrower buckets available for utility trenching. A confirmed factory bucket-width lineup specific to the BH27 was not found, so treat exact widths as a size guide rather than a verified list.

Coupler / bucket mounting

Buckets and work tools mount to the dipper stick through a mechanical pin-style quick coupler built into the BH27 arm, allowing field tool changes without separate cylinders. The dipper-stick linkage and coupler interface trace to the Cat 302.5 mini hydraulic excavator work-tool interface, the stated basis for cross-compatibility with that machine's bucket line.

Auxiliary hydraulic circuit

An optional auxiliary hydraulic line kit routes flow to the end of the dipper stick to power hammers, augers, ditch-cleaning buckets, thumbs, or vibratory plate compactors. Reported flow and pressure for this circuit is roughly 30 L/min at 170 bar; treat as approximate.

Hammers, augers, thumbs, compactors

Beyond buckets, the aux-hydraulic-equipped arm can run mini-excavator-class hydraulic hammers, earth augers, hydraulic thumbs, and vibratory plate compactors sized to this light-duty backhoe class. No BH27-specific tool models are confirmed; hammer and auger lineups cataloged for the later, larger BH150/BH160 line are excluded as a different-capacity family.

Sideshift and stabilizers

The BH27 frame includes a manual sideshift mechanism that slides the whole backhoe left or right on its mounting subframe, useful for digging close to walls or widening a trench. Hydraulic stabilizer legs lower to anchor the unit to the ground while digging.

Host-machine mounting

The BH27 is a rear-mounted work tool that attaches to compact skid-steer and multi-terrain loader carriers (Cat B-series models such as 216B, 226B, 232B, 242B, 247B, 257B and HF variants) through a dedicated mounting/frame group, separate from the loader's front quick-attach plate. It shares this mounting and hydraulic parts family with the BH30 and BH30W siblings, though those are different-capacity units and their buckets/work tools should not be assumed interchangeable without further confirmation.

Maintenance and guarding features

Hydraulic joints use O-ring face seals and pivot joints are grease-fitted for routine field maintenance. No dedicated factory guarding package (boom or cylinder guards) is confirmed specifically for the BH27.

All BH27 assemblies by section

Every catalogued assembly group for the Caterpillar BH27. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Frame And Body

211-1549 Console Gp-Operator

20***34	Arm-Lever	1
20***35	Knob, ... Idler	1
21***49	Console Group-Operator	1
21***50	Console As	1

See all parts with full part numbers in Heavy Parts AI →

204-4041 Console Gp-Operator

20***32	Console As	1
20***33	Plate, . Idler Ass'Y	1
20***34	Arm-Lever	1
20***35	Knob, ... Idler	1

See all parts with full part numbers in Heavy Parts AI →

207-8467 Frame Ar

20***22	Frame Group-Backhoe	1
20***41	. Idler Ass'Y, Console Group-Operator	1
20***76	Stabilizer Group	1
20***99	Lines Group-Connecting	1

See all parts with full part numbers in Heavy Parts AI →

211-1582 Frame Ar

20***76	Stabilizer Group	1
20***68	Transport Group	1
21***47	Frame Group-Backhoe	1
21***49	Console Group-Operator	1

See all parts with full part numbers in Heavy Parts AI →

211-1547 Frame Gp-Backhoe

20***66	Plate	2
21***47	Frame Group-Backhoe	1
21***48	Frame As	1
21***59	Link As	2

See all parts with full part numbers in Heavy Parts AI →

204-4022 Frame Gp-Backhoe

20***22	Frame Group-Backhoe	1
20***23	Frame As	1
20***66	Plate	2
21***58	Link As	2

See all parts with full part numbers in Heavy Parts AI →

204-4069 Frame Gp-Sliding

11***32	Fitting-Grease	2
20***26	Frame As	1
20***49	Bracket As	2
20***50	Stop As	2

See all parts with full part numbers in Heavy Parts AI →

207-8479 Frame Gp-Swing

11***32	Fitting-Grease	4
20***39	.. Bearing., Frame As	1
20***47	Bridge	1
20***48	Cover	2

See all parts with full part numbers in Heavy Parts AI →

211-2082 Guard & Mtg Gp-Cab

21***82	Guard & Mtg Group-Cab	1
8T***21	Washer-Hard; (11x21x2.5-mm Thk)(M10x1.50x30mm)	4
8T***33	Nut (M10x1.50 Thd)	4
8T***36	Capscrew; (Hex Hd) (M10 X 1.50 X 25l Gr 10.9)	4

See all parts with full part numbers in Heavy Parts AI →

204-4076 Stabilizer Gp

09***19	Ring-Retaining	2
20***27	Tube As	2
20***28	Pin	2
20***29	Pin	2

See all parts with full part numbers in Heavy Parts AI →

207-8468 Transport Gp

20***65	Pin	1
20***68	Pin	1
20***68	Transport Group	1
5P***37	Pin (Lock)	1

See all parts with full part numbers in Heavy Parts AI →

Hydraulic System

211-1557 Control Gp-Hydraulic Hand -Boom-Stick-Bucket

20***35	Knob, ... Idler	3
20***65	Lever	3
20***68	Boot	3
20***69	Nut	5

See all parts with full part numbers in Heavy Parts AI →

207-8480 Control Gp-Hydraulic Hand -Boom-Stick-Bucket

20***35	Knob, ... Idler	3
20***80	Control Group-Hydraulic Hand; -Boom-Stick-Bucket	1
20***81	Valve Group-Bank 7	1
20***65	Lever	3

See all parts with full part numbers in Heavy Parts AI →

207-8466 Lines Gp-Auxiliary Hydraulic

15***17	Cap-Dust	1
15***18	Cap-Dust	1
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
16***64	Union	1

See all parts with full part numbers in Heavy Parts AI →

211-9532 Lines Gp-Auxiliary Hydraulic

15***17	Cap-Dust	1
15***18	Cap-Dust	1
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
16***64	Union	1

See all parts with full part numbers in Heavy Parts AI →

204-4106 Lines Gp-Auxiliary Hydraulic

15***17	Cap-Dust	1
15***18	Cap-Dust	1
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
16***64	Union	1

See all parts with full part numbers in Heavy Parts AI →

211-9523 Lines Gp-Boom Cylinder

15***19	Connector Group	2
15***71	Seal	1
20***33	Bolt	1
20***36	Valve	1

See all parts with full part numbers in Heavy Parts AI →

204-4103 Lines Gp-Boom Cylinder

15***19	Connector Group	3
15***71	Seal	1
20***03	Lines Group-Boom Cylinder	1
20***13	Hose As	1

See all parts with full part numbers in Heavy Parts AI →

204-4105 Lines Gp-Bucket Cylinder

15***19	Connector Group	4
15***71	Seal	1
20***05	Lines Group-Bucket Cylinder	1
20***17	Hose As	2

See all parts with full part numbers in Heavy Parts AI →

207-8465 Lines Gp-Bucket Cylinder

15***19	Connector Group	4
15***71	Seal	1
20***18	Hose As	1
20***19	Hose As	1

See all parts with full part numbers in Heavy Parts AI →

211-9531 Lines Gp-Bucket Cylinder

15***19	Connector Group	2
15***71	Seal	1
20***17	Hose As	2
20***38	Tube As	2

See all parts with full part numbers in Heavy Parts AI →

211-1571 Lines Gp-Connecting

15***17	Cap-Dust	1
15***18	Cap-Dust	1
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
18***87	Coupler As-Quick Disconnect; (Male)(Quick Disconnect)	1

See all parts with full part numbers in Heavy Parts AI →

204-4099 Lines Gp-Connecting

15***17	Cap-Dust	1
15***18	Cap-Dust	1
15***94	Coupler As-Quick Disconnect; (Female)(Quick Disconnect)	1
18***87	Coupler As-Quick Disconnect; (Male)(Quick Disconnect)	1

See all parts with full part numbers in Heavy Parts AI →

204-4101 Lines Gp-Sideshift Lock

11***83	Connector	1
15***77	Connector Group	3
15***70	Seal	1
18***07	Connector As	4

See all parts with full part numbers in Heavy Parts AI →

211-1574 Lines Gp-Sideshift Lock

15***77	Connector Group	3
15***70	Seal	1
18***07	Connector As	4
18***75	Seal	1

See all parts with full part numbers in Heavy Parts AI →

204-4100 Lines Gp-Stabilizer

15***19	Connector Group	4
15***71	Seal	1
20***00	Lines Group-Stabilizer	1
20***09	Hose As	2

See all parts with full part numbers in Heavy Parts AI →

211-1568 Lines Gp-Stabilizer

20***28	Connector	4
20***31	Bolt; (Fluid Connector)	4
21***68	Lines Group-Stabilizer	1
21***70	Connector As	4

See all parts with full part numbers in Heavy Parts AI →

211-9524 Lines Gp-Stick Cylinder

20***25	Elbow	2
21***70	Connector As	2
21***24	Lines Group-Stick Cylinder	1
21***25	Hose As	1

See all parts with full part numbers in Heavy Parts AI →

204-4104 Lines Gp-Stick Cylinder

15***19	Connector Group	2
15***71	Seal	1
20***04	Lines Group-Stick Cylinder	1
20***15	Hose As	1

See all parts with full part numbers in Heavy Parts AI →

204-4102 Lines Gp-Swing Cylinder

20***02	Lines Group-Swing Cylinder	1
20***09	Hose As	1
20***10	Hose As	1
20***11	Hose As	2

See all parts with full part numbers in Heavy Parts AI →

211-1578 Lines Gp-Swing Cylinder

20***11	Hose As	2
20***31	Bolt; (Fluid Connector)	6
20***32	Plug	2
21***78	Lines Group-Swing Cylinder	1

See all parts with full part numbers in Heavy Parts AI →

207-8481 Valve Gp-Bank 7

20***81	Valve Group-Bank 7	1
23***10	Valve Group-Control	1
23***11	Valve Group-Control; (Swing)	1
23***12	Valve Group-Control; (Boom)	1

See all parts with full part numbers in Heavy Parts AI →

Service Equipment And Supplies

204-4097 Film Gp

10***63	Film-Instruction; (Return Flow)(Return Flow Direction)	2
15***36	Film-Warning; (Read Operation Manual)	1
15***38	Film-Warning; (Crush Hazard, Stay Back)	2
16***68	Film-Warning; (No Clearance, Stay Back)	2

See all parts with full part numbers in Heavy Parts AI →

204-4096 Film Gp

10***63	Film-Instruction; (Return Flow)(Return Flow Direction)	2
15***36	Film-Warning; (Read Operation Manual)	1
15***38	Film-Warning; (Crush Hazard, Stay Back)	2
16***68	Film-Warning; (No Clearance, Stay Back)	2

See all parts with full part numbers in Heavy Parts AI →

204-4095 Film Gp

10***63	Film-Instruction; (Return Flow)(Return Flow Direction)	2
15***36	Film-Warning; (Read Operation Manual)	1
15***38	Film-Warning; (Crush Hazard, Stay Back)	2
16***68	Film-Warning; (No Clearance, Stay Back)	2

See all parts with full part numbers in Heavy Parts AI →

Work Tool Arrangement

204-4017 Backhoe Ar

20***17	Backhoe Ar	1
20***40	Mounting Group-Backhoe, . Yoke	1
20***96	Film Group	1
20***06	Lines Group-Auxiliary Hydraulic	1

See all parts with full part numbers in Heavy Parts AI →

204-4018 Backhoe Ar

20***18	Backhoe Ar	1
20***40	Mounting Group-Backhoe, . Yoke	1
20***97	Film Group	1
21***82	Frame Ar	1

See all parts with full part numbers in Heavy Parts AI →

204-4016 Backhoe Ar

20***16	Backhoe Ar	1
20***40	Mounting Group-Backhoe, . Yoke	1
20***95	Film Group	1
20***66	Lines Group-Auxiliary Hydraulic	1

See all parts with full part numbers in Heavy Parts AI →

207-8470 Boom Ar

20***03	Lines Group-Boom Cylinder	1
20***70	Boom Ar	1
20***78	Boom Group	1

See all parts with full part numbers in Heavy Parts AI →

211-1584 Boom Ar

20***44	Boom Group, . Yoke	1
21***84	Boom Ar	1
21***23	Lines Group-Boom Cylinder	1

See all parts with full part numbers in Heavy Parts AI →

207-8471 Boom Ar

20***44	Boom Group, . Yoke	1
20***03	Lines Group-Boom Cylinder	1
20***71	Boom Ar	1

See all parts with full part numbers in Heavy Parts AI →

153-7857 Bucket Ar-General Purpose

15***57	Bucket Ar-General Purpose	1
15***81	Tooth Group-Uni	4

See all parts with full part numbers in Heavy Parts AI →

153-7860 Bucket Ar-General Purpose

15***60	Bucket Ar-General Purpose	1
15***81	Tooth Group-Uni	4

See all parts with full part numbers in Heavy Parts AI →

153-7851 Bucket Ar-General Purpose

15***51	Bucket Ar-General Purpose	1
15***81	Tooth Group-Uni	3

See all parts with full part numbers in Heavy Parts AI →

153-7854 Bucket Ar-General Purpose

15***54	Bucket Ar-General Purpose	1
15***81	Tooth Group-Uni	3

See all parts with full part numbers in Heavy Parts AI →

190-7390 Bucket Ar-General Purpose

15***81	Tooth Group-Uni	3
19***90	Bucket Ar-General Purpose	1

See all parts with full part numbers in Heavy Parts AI →

207-8477 Linkage Ar

20***78	Linkage Group-Bucket	1
20***05	Lines Group-Bucket Cylinder	1
20***77	Linkage Ar	1

See all parts with full part numbers in Heavy Parts AI →

207-8476 Linkage Ar

20***78	Linkage Group-Bucket	1
20***65	Lines Group-Bucket Cylinder	1
20***76	Linkage Ar	1

See all parts with full part numbers in Heavy Parts AI →

211-9528 Linkage Ar

21***28	Linkage Ar	1
21***29	Linkage Group-Bucket	1
21***31	Lines Group-Bucket Cylinder	1

See all parts with full part numbers in Heavy Parts AI →

211-1583 Sideshift Ar

20***69	Frame Group-Sliding	1
20***79	Frame Group-Swing	1
21***74	Lines Group-Sideshift Lock	1
21***78	Lines Group-Swing Cylinder	1

See all parts with full part numbers in Heavy Parts AI →

207-8469 Sideshift Ar

20***69	Frame Group-Sliding	1
20***01	Lines Group-Sideshift Lock	1
20***02	Lines Group-Swing Cylinder	1
20***69	Sideshift Ar	1

See all parts with full part numbers in Heavy Parts AI →

211-9527 Stick Ar

20***45	Stick Group-Hoe	1
21***24	Lines Group-Stick Cylinder	1
21***27	Stick Ar	1

See all parts with full part numbers in Heavy Parts AI →

207-8472 Stick Ar

20***04	Lines Group-Stick Cylinder	1
20***72	Stick Ar	1
20***74	Stick Group-Hoe	1

See all parts with full part numbers in Heavy Parts AI →

207-8473 Stick Ar

20***45	Stick Group-Hoe	1
20***04	Lines Group-Stick Cylinder	1
20***73	Stick Ar	1

See all parts with full part numbers in Heavy Parts AI →

Work Tools

207-8478 Boom Gp

20***30	Boom As	1
20***58	Washer; (41x71.5x4.5mm Thk)	1
20***60	Washer; (31x55.5x3mm Thk)	1
20***61	Washer; (36x67x5mm Thk)	1

See all parts with full part numbers in Heavy Parts AI →

204-4044 Boom Gp

11***32	Fitting-Grease	2
20***30	Boom As	1
20***44	Boom Group, . Yoke	1
20***58	Washer; (41x71.5x4.5mm Thk)	1

See all parts with full part numbers in Heavy Parts AI →

153-7863 Bucket As-Ditch Cleaning

15***63

Bucket As-Ditch Cleaning

See all parts with full part numbers in Heavy Parts AI →

153-7865 Bucket As-Ditch Cleaning

15***65

Bucket As-Ditch Cleaning

See all parts with full part numbers in Heavy Parts AI →

169-5725 Coupler Gp-Quick

16***16	Pin-Support	2
16***25	Coupler Group-Quick	1
17***26	Coupler Group-Quick	1
17***27	Shim; (0.5-mm)	4

See all parts with full part numbers in Heavy Parts AI →

179-9826 Coupler Gp-Quick

16***73	Shim; (0.3-mm Thk)	4
16***98	Lock Group-Pin; -Lh	1
16***99	Lock Group-Pin; -Lh	1
16***26	Coupler	1

See all parts with full part numbers in Heavy Parts AI →

211-9529 Linkage Gp-Bucket

11***32	Fitting-Grease	3
20***60	Washer; (31x55.5x3mm Thk)	1
20***71	Bushing	2
20***73	Nut	1

See all parts with full part numbers in Heavy Parts AI →

204-4078 Linkage Gp-Bucket

20***60	Washer; (31x55.5x3mm Thk)	1
20***71	Bushing	2
20***78	Linkage Group-Bucket	1
20***79	Linkage	1

See all parts with full part numbers in Heavy Parts AI →

169-1398 Lock Gp-Pin -Lh

09***81	Pin-Spring	1
15***34	Pin	1
15***95	Knob	1
16***56	Spring	1

See all parts with full part numbers in Heavy Parts AI →

169-1399 Lock Gp-Pin -Lh

09***81	Pin-Spring	1
15***34	Pin	1
15***95	Knob	1
16***56	Spring	1

See all parts with full part numbers in Heavy Parts AI →

204-4040 Mounting Gp-Backhoe

17***11	Locknut; (M16x2-Thd)	4
20***24	Bracket As	1
20***40	Mounting Group-Backhoe, . Yoke	1
8T***74	Bolt; (M16x2.0x120mm)	4

See all parts with full part numbers in Heavy Parts AI →

154-2683 Mounting Gp-Bucket

15***83	Mounting Group-Bucket	1
16***20	Pin	2
23***44	Pin As	2

See all parts with full part numbers in Heavy Parts AI →

204-4045 Stick Gp-Hoe

20***31	Stick As	1
20***45	Stick Group-Hoe	1
20***60	Washer; (31x55.5x3mm Thk)	3
20***70	Bushing	2

See all parts with full part numbers in Heavy Parts AI →

207-8474 Stick Gp-Hoe

20***60	Washer; (31x55.5x3mm Thk)	3
20***70	Bushing	2
20***71	Bushing	4
20***82	Pin	1

See all parts with full part numbers in Heavy Parts AI →

153-7881 Tooth Gp-Uni

13***90	Tooth-Uni	1
15***81	Tooth Group-Uni	1
15***39	Screw-Flat Head; (M16x2x60-mm)	2
8T***78	Locknut; (M16x2-Thd)	2

See all parts with full part numbers in Heavy Parts AI →

BH27 serial number reference

The PIN plate on the BH27 is riveted to the attachment's main frame or swing-frame casting, usually near the mounting bracket/quick-coupler end where it stays visible after the tool is hitched to the carrier. Read the first three characters as the prefix (identifies the specific model/configuration build), followed by the sequential unit number; B2H00001 is the start of the BH27 production range.

Prefix	Identifies	Notes
B2H	BH27 backhoe attachment for skid steer loaders and compact track loaders - narrow (1576 mm) mounting frame configuration	Passive hydraulic work tool with no engine of its own - draws hydraulics from the host carrier, so no engine/plant fitment applies. No lettered BH27 successor found. Parts and service documentation for this prefix is issued jointly with the sibling BH30 (prefix B3H, same narrow frame) and BH30W (prefix B3W, wider 1730 mm frame) under one shared manual set - do not pull B3H/B3W content into BH27 records. The shared documentation lists mid-size Cat skid steer/CTL models (216/226/228/232/242/247/257 class) as carriers for the narrow-frame B2H/B3H units; confirm exact carrier fitment with dealer before treating as definitive.

Frequently asked questions

What carriers is the BH27 compatible with?

BH27 mounts to Cat's small-frame skid steer and multi-terrain loader lineup, confirmed compatible with the 216B, 226B, 226B HF, 232B, 242B, 242B HF, 247B, 257B, and 257B HF. It attaches through a dedicated rear mounting subframe rather than the carrier's front quick-attach plate, and needs a minimum 30 L/min at roughly 170 bar from the host's auxiliary hydraulic circuit to function at rated performance.

What is the BH27's operating weight and dig depth?

Base operating weight is about 700 kg (1,543 lb); used units fitted with buckets and options have been recorded up to roughly 785 kg (1,731 lb). Digging depth is 2585 mm (101.8 in, about 8.5 ft), reach is 3486 mm (137.2 in) from the swing pivot, and bucket breakout force runs around 3970 kg (8,753 lb).

What replaced the BH27?

No lettered BH27 successor was ever issued - it ran as a single production configuration under serial prefix B2H, sold alongside its longer-reach siblings BH30 and BH30W under shared documentation. Cat later replaced that entire lineup with the BH150/BH160 backhoe-for-skid-steer series; by the time that line's specalog was published, BH27 was already out of production.

What BH27 owners discuss

What's the first thing that wears out on one of these backhoe attachments?

Pin and bushing play at the boom, dipper, and swing-tower pivots. It shows up as visible slack when you rock the bucket at full extension, and once slop starts it accelerates fast because the pin stops rotating true in the bore and starts hammering it oval. The bushing is the sacrificial part - it's meant to wear before the pin boss on the mainframe does, so don't wait for metal-on-metal before regreasing or replacing. Cut your grease interval in half if the unit works wet ground or sits outside between jobs.

Bucket curl and swing feel sluggish compared to the carrier's own loader bucket - is that normal?

Only if the carrier can't feed the attachment its rated auxiliary flow and pressure. This class of hydraulic backhoe is sized around a specific flow-and-pressure window on the host's third function; hook it to a carrier running under that spec and every function - swing, stick, curl - feels underpowered and hesitant, not just the bucket. Before assuming a hydraulic fault in the tool itself, confirm the carrier's aux circuit actually meets the attachment's minimum flow rating; a mismatch reads exactly like a tired cylinder or valve.

One of the cylinders creeps down overnight - how worried should I be?

Some drift over many hours from thermal contraction is normal. Drift that shows up within minutes, especially on the boom or dipper cylinder, points to worn rod seals or a holding/load-check valve that's no longer sealing. It's not an emergency for routine digging, but it becomes safety-critical the moment the tool is holding anything suspended or someone works underneath a raised boom. Have your dealer verify the holding valve and cylinder seal condition before relying on it to hold a load.

The swing action has noticeable side play under load - what's causing that?

Usually worn swing-tower pins and bushings, or backlash building up in the swing cylinder's pin connections. Rock the tool side to side at the swing pivot with the carrier off and load released - any clunk or visible movement confirms it. Units that see a lot of hammer or breaker time wear their swing pins faster than ones used mostly for digging, since impact loading works that joint far harder than a smooth digging cycle.

Where should I look for cracks or bad repair welds on one of these?

Concentrate on the boom-to-swing-tower junction, the dipper-to-boom pivot boss, and where the stabilizer arms tie into the mainframe - these take the highest cyclic stress on any backhoe-style attachment. Fresh paint, grinding marks, or a weld bead that doesn't match the surrounding casting almost always means a prior crack repair. Hairline cracks radiating from a pin boss are the most common failure point and are easy to miss without a flashlight and a clean surface.

Does this attachment throw fault codes or have electrical issues of its own?

No - it's a purely mechanical and hydraulic tool with no engine, ECM, or sensors of its own. If the carrier machine shows a fault or the controls act erratic only when this attachment is hooked up, the problem is in the carrier's auxiliary-hydraulics wiring: the proportional valve, a joystick detent switch, or the flow-select circuit and its connector at the quick coupler. Chase the carrier side first, not the attachment.

What should I check before buying a used one?

Work every pivot by hand for pin/bushing slack, raise a load and watch each cylinder for creep, and inspect the boom-to-swing-tower junction and stabilizer mounts for grinding marks or repaint that signal a past crack repair. Check the coupler's wedge and lock for wear and confirm it actually matches your carrier's coupler pattern - mount configurations shifted across production runs, and a mismatch may need an adapter. Look over hydraulic hoses and fittings for weeping, and ask the seller directly about hammer or breaker use, since that duty cycle beats up pins and welds far faster than normal digging. Have your dealer verify structural welds and cylinder holding-valve condition before putting it into daily production work.

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

Need a specific BH27 part?

Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.

Search parts in the app