Caterpillar 224
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 224 is a wheeled (rubber-tired) mobile hydraulic excavator from Caterpillar's 211/212/213/214/224 wheel-excavator family, built in the mid-1980s under the 5TC serial prefix as one of the larger machines in that line. Factory spec sheets tie the 224 to a Deutz BF6L913, an air-cooled turbocharged inline-six diesel rated around 143 hp (107 kW); some dealer and parts references instead cite a Perkins T6.354-series engine, so treat the exact powerplant as configuration- or market-dependent and confirm it off the engine tag before ordering parts. Caterpillar offered the 224 with a choice of boom and stick combinations, boom lengths running roughly 1.8 to 2.8 m, giving working reach from about 9 to 9.7 m and dig depth from 5 to 6.5 m. Operating weight for the base 224 is not published in the spec sheets that survive. The plain 224 sits ahead of the Cat 224B, which took over the badge from 1989 through 1994 with a Cat 3116 turbocharged diesel and a documented operating weight in the 20-21 tonne range; no earlier model carrying the 224 name is documented, so the 224 reads as the family's original entry at this size class before the B-series update.
The move from 224 to 224B was a full powertrain and control change, not a cosmetic refresh: Caterpillar swapped the mechanical Deutz/Perkins engine for its own 3116 direct-injection turbo diesel, revised the wheelbase, and reworked the operator controls, which pushed operating weight up into the low-20-tonne class. The plain 224 predates electronic engine management and scan-tool diagnostics entirely - fuel injection timing, transmission, and axle controls are all mechanical, which keeps troubleshooting straightforward but removes any fault-code shortcut when something goes wrong. Few 224s remain in active service today, and documentation on the base model is thin compared with later Cat excavators. That scarcity is exactly why the used and parts market still pays attention to it: shops running one lean on cross-reference knowledge of Deutz or Perkins wear parts, generic axle and swing-drive components, and salvage sourcing rather than a live factory parts catalog, and a 224 with a documented service history commands a real premium over one with unknown background.
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 224 specifications
Engine
| 224 (base series) engine | Deutz BF6L913 — 6-cylinder, turbocharged, air-cooled diesel. Gross power 107 kW (143.5 hp). Displacement 6.13 L (374.1 cu in). Some references instead cite a Perkins T6.354-series engine for this model — confirm from the engine dataplate. |
| 224B series engine | Cat 3116 DIT (direct-injection, turbocharged). Gross power 100 kW (135 hp). Displacement 6.6 L (402.8 cu in). Introduced with the B-series update (from 1989–1991) and produced through 1994. |
| Emissions tier | Not applicable. Both engine generations predate nonroad diesel emissions-tier regulation. |
| Net power / cylinder count (224B) | Net power not separately published for this model. Cylinder count for the 3116 not confirmed on the machine spec sheet; the base-series Deutz BF6L913 is a 6-cylinder unit. |
Weights
| Operating weight (224, base series) | Not published in the available spec sheets for this configuration. |
| Operating weight (224B) | Reported 20.3–21.4 t (44,750–47,200 lb). Figures vary by source and by configuration/model year within the 1989–1994 production run — treat as a range, not a fixed figure. |
| Ground pressure | Not applicable. Both series are rubber-tire wheel excavators, not tracked machines. |
| Transport weight | Not separately documented; only operating weight is published. |
Dimensions
| Wheelbase (224) | 2.65 m (8.7 ft) |
| Overall width (224) | approx. 2.49 m (8.17 ft) |
| Width, outriggers down (224) | 3.65 m (11.98 ft) |
| Ground clearance (224) | 0.35 m (1.15 ft) |
| Height to top of cab (224) | 3.22 m (10.55 ft) |
| Upper structure clearance (224) | 1.28 m (4.19 ft) |
| Tires (224) | Dual 10.00-20 |
| Wheelbase (224B) | 2.75 m (9.03 ft) |
| Overall width (224B) | 2.66 m (8.73 ft) |
| Overall length (224B) | 9.34 m (30.6 ft), per transport dimension listing |
| Width, outriggers down (224B) | 3.87 m (12.7 ft) |
| Ground clearance (224B) | 0.34 m (1.12 ft) |
| Height to top of cab (224B) | 3.19 m (10.47 ft) |
| Tires (224B) | Dual 10.00-20, 12PR |
| Tail swing radius | Not documented for either series in available spec sheets. |
| Track shoe width / undercarriage length | Not applicable — wheeled undercarriage on both series. Wheelbase figures above stand in for undercarriage length. |
Performance
| Max dig depth (224) | 5.00–6.50 m (16.41–21.33 ft), depending on boom/stick configuration |
| Max reach along ground (224) | up to 9.68 m (31.76 ft) on the longest boom/stick configuration |
| Boom/stick options (224) | One-piece boom/stick offered in roughly 1.8 m and 2.3 m lengths, giving the depth/reach range above |
| Max dig depth (224B) | 5.53–7.71 m (18.13–25.3 ft), depending on configuration |
| Max reach along ground (224B) | 8.76–10.75 m (28.75–35.27 ft), depending on configuration |
| Bucket capacity (224B) | approx. 1.2 m³ (typical bucket, above average for this class) |
| Max dump height / max cutting height | Not documented for either series in available spec sheets. |
| Swing speed / travel speed / gradeability / drawbar pull | Not documented for either series in available spec sheets — verify with dealer or original brochure if needed. |
Forces
| Bucket digging force | Not documented for either series in available spec sheets. |
| Stick/arm digging force | Not documented for either series in available spec sheets. Only boom/stick length options (affecting reach and depth) are published, not force ratings. |
Service capacities (summary)
| Fuel tank (224) | 230 L (60.8 gal) |
| Hydraulic system (224) | 350 L (92.5 gal); relief valve pressure approx. 300 bar (4351 psi); pump flow approx. 324 L/min (85.6 gal/min) |
| Fuel tank (224B) | 330 L (87.2 gal) |
| Hydraulic system (224B) | 390 L (103.1 gal); relief valve pressure approx. 320 bar (4641 psi) |
| Engine oil capacity | Not documented for either series in available spec sheets. |
| Cooling system capacity | Not documented for either series in available spec sheets. |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
224 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine crankcase (with filter) | Not published in surviving factory literature for this exact wheeled-excavator configuration — verify against the engine data plate before ordering oil or filters. | Primary documentation ties the 224 to a Deutz-family air-cooled turbo diesel (BF6L913, about 107 kW/143 hp); some references instead cite a Perkins T6.354.4-lineage engine, so confirm the actual engine from the dataplate before servicing. Use a heavy-duty diesel engine oil: SAE 15W-40 multigrade for temperate climates, 10W-30 in cold climates, straight SAE 30 in sustained heat, meeting API CD/CE or later CG-4/CH-4 service (Cat DEO or equivalent branded heavy-duty diesel oil). |
| Cooling system | Not published for this model in surviving literature — verify against the OMM or radiator tag. | Standard heavy-duty coolant, roughly 50/50 water-glycol mix; extend to a higher glycol ratio for hard winter climates. A Cat-branded extended-life coolant (or equivalent heavy-duty antifreeze/corrosion-inhibitor coolant) is suitable if resourcing with a current product. |
| Fuel tank | 230 L (60.8 US gal) | No. 2-D diesel fuel; switch to a winter-grade or No. 1-D blend below freezing to prevent gelling. |
| Hydraulic system (total, incl. tank) | 350 L (92.5 US gal) total system fill | Anti-wear hydraulic oil, Cat HYDO (or equivalent branded anti-wear hydraulic fluid) — viscosity graded by ambient temperature: a lighter multigrade (around 10W) for cold-climate starts, ISO VG 46 for temperate service, heavier grade for sustained hot-climate operation. |
| Hydraulic tank | Not broken out separately from the total system figure in available records. | Same anti-wear hydraulic oil as the system fill above; check tank sight gauge at operating temperature. |
| Final drive / axle differentials (front and rear — wheeled undercarriage) | Not published for this model — verify with dealer parts book. | This is a wheeled, not tracked, excavator, so there are no track final drives. Front and rear axle differential and planetary hub housings take a Cat TDTO-type transmission/drive-train oil or a straight EP 80W-90 gear oil, per typical Cat practice for this machine class and era. |
| Swing (slew) drive | Not published for this model — verify with dealer parts book. | Slew-drive gearbox takes a Cat TDTO-type drive-train oil or SAE 30 / EP 80W-90 gear oil, consistent with general Cat guidance for machines of this class and era. Grease the slew ring separately (see grease spec). |
| Pilot / other circuits | Not separately documented for this model. | No distinct pilot-circuit fluid spec found separate from the main hydraulic system; where a machine uses a dedicated pilot filter/reservoir it draws the same anti-wear hydraulic oil as the main system. |
| Grease (spec only) | N/A — grease points serviced individually, not a sump fill. | General-purpose multipurpose grease, NLGI 2, lithium or lithium-complex base, for boom/stick/bucket pins and bushings and the slew ring; step up to an extreme-pressure (EP) grade at heavily loaded pivot points. |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 224 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
| Every 4,000 h |
|
Servicing the 224 beyond the schedule
Predictive Maintenance & Fluid Analysis
Because the 224 predates electronic diagnostics, fluid sampling is the only early-warning system available. Pull engine oil samples at every oil change to track wear metals from the Deutz/Perkins cylinder liners and turbocharger bearing; hydraulic oil analysis flags pump and swing-motor wear before a control valve sticks. Watch coolant condition on liquid-cooled variants and cooling-fin cleanliness on the air-cooled Deutz, since blocked fins overheat the engine fast. Axle and swing-drive oil samples catch gear pitting long before noise appears.
Corrective & Common Repairs
Expect wear at the axle king pins, steering linkage, and outrigger cylinders from decades of highway travel and dig cycles. Turbocharger and injector pump seals on the Deutz/Perkins engine are common failure points after long service gaps. Hydraulic hose runs to the boom and outriggers crack with age and need full inspection, not just visual spot checks. Swing-gear backlash and dual-tire wear (10.00-20) are the other recurring complaints - budget for tire replacement and drive-axle bearing work on any 224 bought without full service history.
Overhaul & Rebuild Points
A rebuild-grade 224 needs the boom, stick, and bucket pin/bushing sets replaced as a set, not piecemeal, since mixed wear accelerates play everywhere else. Engine top-end work (head, injectors, turbo) is the biggest single spend given parts scarcity for the Deutz/Perkins block. Hydraulic pump and main control valve reconditioning should follow any oil-analysis flag rather than wait for failure. Check the wheeled chassis and outrigger frame for stress cracks around mounting points before committing to a full undercarriage-equivalent rebuild.
Seasonal & Environmental Servicing
Air-cooled Deutz engines need clear cooling fins year-round; dusty or agricultural sites demand more frequent fin and turbo-inlet cleaning than the base interval. Cold-weather starts on a mechanical fuel system benefit from fuel conditioner and a fresh water-separator drain before winter. Hot, dusty conditions accelerate hydraulic filter loading and tire wear on the dual 10.00-20 setup - shorten filter and pressure checks accordingly. Wash axle and swing-drive breathers after wet or muddy jobs to stop contaminated oil ingestion.
224 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| Engine Oil Pressure warning lamp (red, oil-can symbol) | Engine lubrication pressure has dropped below the safe minimum | Low oil level, clogged oil filter/screen, worn oil pump, or a failed pressure sender/switch | Stop the engine immediately, check oil level and filter condition before restarting |
| Coolant Temperature warning lamp (red, thermometer symbol) | Engine coolant temperature has exceeded the safe operating range | Low coolant level, blocked radiator fins, slipping or broken fan belt, or thermostat stuck closed | Idle down, shut off if temperature keeps climbing, let engine cool before checking coolant level and radiator |
| Alternator/Battery Charge warning lamp (red, battery symbol) | Charging system is not putting out sufficient voltage to the battery | Broken or slipping fan/alternator belt, failed alternator, or loose/corroded battery cable | Check belt tension and battery terminals; have the charging system tested if the lamp stays on with the engine running |
| Air Cleaner Restriction indicator (visual pop-up/vacuum gauge, yellow band) | Intake air filter restriction has reached the service limit | Dirty or clogged primary air filter element | Service or replace the air filter element and reset the indicator |
| Hydraulic Oil Temperature gauge in red zone | Hydraulic system oil temperature has climbed above normal operating range | Low hydraulic fluid level, clogged oil cooler, overworking the machine, or internal pump/relief valve wear generating excess heat | Reduce load, idle to allow cooling, then check fluid level and cooler fins for blockage |
| Parking Brake indicator lamp | Parking brake is applied | Operator-set brake, or a brake switch/solenoid fault keeping the lamp on with the brake released | Confirm brake lever/switch position; if lamp stays lit with brake released, check the brake switch and wiring |
| Fuel Level low warning (gauge needle in red / low-fuel lamp where fitted) | Fuel tank level has dropped to reserve | Normal fuel consumption, or a fuel gauge sender fault reading falsely low | Refuel; if gauge reading is inconsistent with a visual tank check, inspect the sender unit |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
224 attachments & work tools
Buckets
No GD/HD/rock capacity chart or bucket-width table is published for this specific model in current OEM or aftermarket attachment references; the 224 is a legacy wheeled excavator that predates the modern bucket-classing systems dealers use today. Its digging envelope (roughly 5.5 m max digging depth, 8.6 m max reach) places it in the same general working-size window as its 1970s/80s crawler sibling, the 225. Work tools on this generation mount pin-on; verify stick/bucket pin diameter and width by direct measurement or against the machine's own parts book rather than a size-class assumption.
Hydraulic hammers
No documented brand/class match (e.g., a specific breaker weight class) exists for the 224 in available attachment guides — current hammer compatibility charts from major breaker brands only cover Caterpillar's current-production excavator lineup, not this discontinued 1970s/80s model. Breaker sizing for a machine this old should be confirmed with a breaker dealer using the excavator's actual operating weight and stick hydraulics, not a published class table.
Quick couplers
Not documented for this model. This generation of Cat wheeled excavator was built in the pin-on era, before hydraulic quick-coupler systems became a standard catalog option; no factory or aftermarket coupler listing for the 224 turned up in available records.
Thumbs/grapples
Not documented for this model. No thumb or grapple compatibility listing specific to the 224 appears in current Cat or aftermarket attachment catalogs, which for this working-tool category only cover later/current excavator model lines.
Rippers
No factory ripper option is documented for the 224. Field/auction records do show at least one 224 wheeled unit running a pulverizer-style demolition attachment on the stick, confirming the linkage accepts pin-on hydraulic demolition tools of that era, but this is not an OEM ripper compatibility spec.
Hydraulic kit notes
The 224 (mobile/wheeled configuration) runs a Deutz BF6L913 air-cooled diesel rated near 143.5 hp gross. Hydraulic relief is documented near 300 bar (4,351 psi) with pump flow near 324 L/min (85.6 US gpm); these figures run higher than typical for this machine class and era, so verify actual circuit pressure and flow against the machine's own hydraulic schematic before sizing or adding any auxiliary work-tool circuit.
All 224 assemblies by section
Every catalogued assembly group for the Caterpillar 224. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Engine
7c2801 Compressor Gp-Air
| 7C***01 | Air Compressor Group; Compressor Gp-Air | 1 |
7w4722 Alternator Gp
| 7W***22 | Alternator Group-Charging | 1 |
7w4704 Camshaft Gp
| 7W***04 | Camshaft Group; Camshaft Group | 1 |
5w7913 Compressor As-Air
| 5W***13 | Compressor As | 1 |
7w4508 Cover Gp-Valve Mechanism
| 7W***08 | Cover Group-Valve Mechanism; Cover Group-Valve Mechanism | 1 |
7w4702 Crankshaft Gp
| 7W***02 | Crankshaft Group; Crankshaft Group | 1 |
7c8944 Crankshaft Gp
| 7C***44 | Crankshaft Group; Crankshaft Group | 1 |
7w4725 Cylinder Block As
| 7W***25 | Cylinder Block As | 1 |
7w4701 Cylinder Block Gp
| 7W***01 | Cylinder Block Group; Cylinder Block Group | 1 |
7c2803 Cylinder Head As
| 7C***03 | Cylinder Head Group | 1 |
7w4747 Cylinder Head Gp-Basic
| 7W***47 | Cylinder Head Group | 1 |
7w4705 Cylinder Head Gp
| 7W***05 | Cylinder Head Group; Head Group-Cylinder | 1 |
7w4708 Drive Gp-Auxiliary
| 7W***08 | Drive Group-Auxiliary; Drive Group-Auxiliary | 1 |
7w4700 Engine Ar-Primary
| 7C***01 | Air Compressor Group; Compressor Gp-Air | 1 |
| 7C***44 | Crankshaft Group; Crankshaft Group | 1 |
| 7C***46 | Lines Group-Fuel Injection; Lines Group-Fuel Injection | 1 |
7w4712 Filter Gp-Engine Oil
| 7W***12 | Filter Group-Engine Oil; Duplex Engine Oil Filter Group | 1 |
7w4529 Filter Gp-Fuel
| 7W***29 | Filter Group-Fuel; Fuel Filter Group | 1 |
7w1141 Flywheel Gp
| 7W***41 | Flywheel Group; Flywheel Group | 1 |
7w4523 Disposal Gp-Fumes
| 7W***23 | Fumes Disposal Group; Fumes Disposal Group | 1 |
7w4516 Gauge Gp-Oil
| 7W***16 | Gauge Group-Oil Level (Dipstick) | 1 |
7w4510 Gear Gp-Front Idler
| 7W***10 | Gear Group-Front Idler; Gear Group-Front Idler | 1 |
7w4513 Housing Gp-Flywheel
| 7W***13 | Housing Group-Flywheel; Housing Group-Flywheel | 1 |
7w4723 Housing Gp-Front
| 7W***23 | Housing Group-Front; Front Housing Group | 1 |
7w4507 Lifting Gp
| 7W***07 | Lifting Group | 1 |
7w4711 Lines Gp-Engine Oil
| 7W***11 | Lines Group-Engine Oil; Engine Oil Lines Group | 1 |
7w4527 Lines Gp-Fuel Filter
| 7W***27 | Lines Group-Fuel Filter; Fuel Filter Lines Group | 1 |
7c8946 Lines Gp-Fuel Injection
| 7C***46 | Lines Group-Fuel Injection; Lines Group-Fuel Injection | 1 |
7w4721 Lines Gp-Fuel Injection
| 7W***21 | Lines Group-Fuel Injection; Lines Group-Fuel Injection | 1 |
7w4520 Lines Gp-Water
| 7W***20 | Lines Group-Water; Lines Group-Water | 1 |
7w4718 Manifold Gp-Inlet
| 7W***18 | Manifold Group-Inlet; Inlet Manifold Group | 1 |
7w4534 Mounting Gp-Engine
| 7W***34 | Mounting Group-Engine; Engine Mounting Group | 1 |
7w7185 Mounting Gp-Fan
| 7W***85 | Mounting Group-Fan; Fan Mounting Group | 1 |
7w4515 Pan Gp-Oil
| 7W***15 | Pan Group-Oil; Oil Pan Group | 1 |
7w4703 Piston Gp
| 7W***03 | Piston & Rod Group; Rod & Piston Group | 1 |
7w4710 Pulley Gp-Tensioner
| 7W***10 | Pulley Group; Tensioner Pulley Group | 1 |
7w4709 Pulley Gp-Crankshaft
| 7W***09 | Pulley Group-Crankshaft; Crankshaft Pulley Group | 1 |
7w4713 Pump Gp-Engine Oil
| 7W***13 | Pump Group-Engine Oil; Pump Group-Engine Oil | 1 |
7w4528 Pump Gp-Fuel
| 7W***28 | Pump Group-Fuel; Pump Group-Fuel | 1 |
7w4720 Pump Gp-Fuel Injection
| 7W***20 | Pump Group-Fuel Injection; Fuel Injection Pump Group | 1 |
7w4715 Pump Gp-Water
| 7W***15 | Pump Group-Water; Water Pump Group | 1 |
7w4717 Manifold Gp-Exhaust
| 7W***14 | Seal-Nut | 1 |
7w4738 Aid Gp-Starting
| 7W***38 | Starting Aid Group; Starting Aid Group | 1 |
7w4532 Motor Gp-Electric Starting
| 7W***32 | Starting Motor Group-Electric; Motor Gp-Electric Starting | 1 |
7w4565 Turbocharger Gp-Basic
| 7W***65 | Turbocharger Group | 1 |
7w4719 Turbocharger Gp
| 7W***19 | Turbocharger Group; Turbocharger Group | 1 |
7w4506 Valve Mechanism Gp
| 7W***06 | Valve-Mechanism Group; Valve Mechanism Group | 1 |
224 serial number reference
The PIN/serial plate on a Cat 224 sits on the machine frame, commonly on the right-side exterior of the operator's cab below the window on Cat excavators of this era. Read the first three characters as the prefix (identifies model and build series - 5TC for the 224) and the following five digits as the unit's sequence number within that prefix run. On a full 17-character PIN format, the same 3-letter prefix plus sequence appears within the string.
| Prefix | Identifies | Notes |
|---|---|---|
| 5TC | 224 wheel-type (mobile) excavator, sole known production series | Covers 5TC00001 and up. Matches the factory Operation & Maintenance Manual titled for the CAT 224 Excavator (5TC00001-UP), first published 1985. Engine is a Deutz-sourced air-cooled diesel, BF6L913 family, rated about 143 hp (107 kW) gross - consistent with Cat's other small excavators of that era (e.g. 212) which also used Deutz-family engines under Cat badging. No second prefix or documented upper serial limit found for this model. Superseded by the 224B, a distinct later generation on a Cat 3116 diesel; sources disagree on the exact start year for the 224B (seen as both 1989 and 1991), so treat the 5TC-to-224B cutoff as approximate - confirm exact serial break with your dealer. |
Frequently asked questions
What engine powers the Caterpillar 224?
Spec sheets for the 224 point to a Deutz BF6L913, an air-cooled turbocharged inline-six diesel rated around 143 hp (107 kW). Some dealer and parts references instead list a Perkins T6.354-series engine, so the exact powerplant can vary by configuration or market - check the engine tag on your specific machine before ordering parts.
What is the operating weight of the Caterpillar 224?
Caterpillar's surviving literature for the base 224 does not publish an operating weight. Its successor, the 224B, is documented at roughly 20-21 tonnes (44,000-47,000 lb); the 224 itself, built lighter and without the 3116 engine and revised chassis, likely falls under that figure, but treat any specific number for the plain 224 as unverified until you weigh the machine or find its original spec sheet.
What replaced the Caterpillar 224?
The Cat 224B took over the model line from 1989 through 1994, replacing the mechanical Deutz/Perkins engine with Caterpillar's own 3116 direct-injection turbo diesel and revising the wheelbase and control layout. No documented model preceded the 224 under this designation, so it appears to be the original size-class entry in Caterpillar's 211-224 wheel-excavator family before the B-series update.
What 224 owners discuss
What engine does the Caterpillar 224 actually run — Deutz or Perkins?
What do owners say about the factory tires and off-road traction?
How does the 224 handle soft or wet ground compared to a tracked machine?
Are there known hydraulic quirks to watch for on a machine this old?
What are the operating quirks of the Deutz air-cooled engine used in this machine?
What electrical or sensor problems come up with the 224?
What should I check when buying a used Cat 224?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 224 part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.