Caterpillar 826C
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar 826C is a heavy-duty landfill compactor designed for high-capacity waste management and earthmoving applications. This machine features a 6-cylinder, turbocharged 3406 engine delivering approximately 315 hp (net) or 341 hp (gross). It operates with a standard operating weight of roughly 69,732 lb (31,625 kg) and is characterized by its large drum configuration. The series includes various configurations to meet specific jobsite requirements for width and weight.
Across generations, the 826C transitioned through significant powertrain and emission evolutions, moving from older diesel architectures to the more modern Tier 4 Final standards seen in later models like the 826K. Today, the 826C remains a staple in the used equipment market due to its robust Caterpillar 3406 engine and planetary powershift transmission. Its availability for parts and its proven durability make it a high-value asset for fleet managers looking for reliable compaction performance without the premium cost of new Tier 4 machinery.
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 826C specifications
Engine
| Engine model | 3406 |
| Gross power | 341 hp |
| Net power | 315 hp |
| Displacement | 891 cu in |
| Cylinders | 6 |
| Aspiration | turbocharged |
Weights
| Operating weight | 69,732.3 lb (31,631.5 kg) |
Dimensions
| Length with blade on ground | 25.33 ft (7.72 m) |
| Width over wheels | 12.47 ft (3.80 m) |
| Height to top of cab | 13.09 ft (3.99 m) |
| Wheelbase | 11.59 ft (3.53 m) |
| Ground clearance | 1.66 ft (0.51 m) |
Performance
| Max speed | 20.2 mph (32.51 km/h) |
| Transmission type | Cat planetary powershift |
| Forward gears | 4 |
| Reverse gears | 4 |
| Front wheels drum diameter | 60.1 in (1.53 m) |
| Front wheels drum width | 47.3 in (1.20 m) |
| Rear wheels drum diameter | 60.1 in (1.53 m) |
| Rear wheels drum width | 47.3 in (1.20 m) |
Service capacities (summary)
| Fuel capacity | 158.6 gal (599.9 l) |
| Hydraulic system fluid capacity | 115.1 l (30.4 gal) |
| Engine oil capacity | 28.0 l (7.4 gal) |
| Cooling system fluid capacity | 85.2 l (22.5 gal) |
| Transmission fluid capacity | 62.1 l (16.4 gal) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
826C fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase | 28.01 L (7.4 gal) | Cat DEO or Cat DEO-ULS (for Tier 4 engines); SAE 10W-30 preferred for ambient temperatures between -18°C (0°F) and 40°C (104°F). Use higher viscosity if cold start requirements dictate; use SAE 50 for hot climates only. |
| Cooling System | 85.18 L (22.5 gal) | Not specified by name in provided documentation. |
| Fuel Tank | 599.96 L (158.6 gal) | ULSD (ultra-low sulfur diesel) with 15 ppm sulfur or less; compatible with up to 20% biodiesel FAME, 100% renewable diesel, HVO, or GTL fuels. |
| Transmission/Powertrain | 62.08 L (16.4 gal) | Cat TDTO; use Cat TDTO Cold Weather for operations below -25°C. |
| Hydraulic System and Tank | 115.09 L (30.4 gal) | Cat HYDO Advanced 10 (SAE 10W) for cold to moderate temperatures; Cat HYDO Advanced 30 (SAE 30W) for moderate to hot temperatures. |
| Grease |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar 826C maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the 826C beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Caterpillar S.O.S fluid analysis to monitor engine oil, hydraulic fluid, and coolant. Regularly check for wear metals like iron or copper and contaminants such as silicon (dirt) or sodium (coolant). For the 826C, monitoring hydraulic oil particle counts is critical to prevent pump failure. Ensure all top-offs use approved fluids like Cat HYDO Advanced or DEO to avoid chemical sludge formation in the hydraulic system.
Corrective & Common Repairs
Address transmission slippage by inspecting the Caterpillar planetary powershift system and checking fluid levels. Monitor for air entry in hydraulic lines, which can cause cavitation and pump damage. If engine power drops, inspect the turbocharger and fuel system for obstructions. For 826C units experiencing slow movement, verify that the transmission fluid is at the correct level and check for internal component wear.
Overhaul & Rebuild Points
Plan major interventions during PM4 intervals, focusing on a full hydraulic oil change and coolant flush. Evaluate the 3406 engine for piston, ring, or bearing wear if oil analysis shows high metal counts. Inspect structural welds on the chassis and boom for fatigue. During transmission overhauls, examine the planetary gears and torque converter for signs of heat-related degradation or mechanical failure.
Seasonal & Environment Servicing
In dusty or quarry environments, increase air filter inspections to a daily frequency and clean radiator fins every shift. In high-heat applications, prioritize checking the hydraulic oil cooler for debris to prevent overheating. For machines operating in cold climates, ensure fuel quality is maintained and check battery condition and charging system output (50 amp alternator) to guarantee reliable starting during winter months.
826C common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 8T-6765 | Plug-Pipe | Scheduled service item | Check fitment → |
| 9S-8752 | Nut-Full | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
826C fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 110-0 | Engine Coolant Temperature — Above Normal | Low coolant level or thermostat failure | Inspect cooling system and refill coolant |
| 110-3 | Engine Coolant Temp Sensor — Voltage High | Open circuit or sensor failure | Check wiring and replace sensor if faulty |
| 174-3 | Engine Fuel Temperature — Voltage Above Normal | Open circuit in sensor wiring | Inspect harness and replace sensor if necessary |
| 190-8 | Engine Speed — Abnormal Frequency | Speed sensor air gap, sensor failure, or tone ring damage | Check sensor gap and test speed sensor/tone ring |
| 41-3 | 8-Volt DC Supply — Voltage Above Normal | Short to power on 8V reference circuit | Inspect sensors sharing the 8V supply and isolate fault |
| 41-4 | 8-Volt DC Supply — Voltage Below Normal | Short to ground on 8V reference circuit | Disconnect sensors one at a time to locate short |
| 2348-9 | SAE J1939 Data Link #2 — Abnormal Update Rate | CAN bus wiring damage or termination fault | Check CAN wiring and measure termination resistance |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
826C attachments & work tools
Blades
Standard configuration includes a blade with 14.7 ft (4.48 m) width and 76 in (1.93 m) height.
Protection & Guarding
Specialized waste guarding is available to protect key components from debris, chemicals, and material wrapping.
Mounting & Hydraulics
Machine utilizes Caterpillar planetary powershift transmission. Hydraulic systems are compatible with Cat HYDO Advanced oils for component protection.
All 826C assemblies by section
Every catalogued assembly group for the Caterpillar 826C. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Basic Engine
308-2942 Kit-Hardware
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
| 0T***65 | Bolt--3/8" X 3 1/2"--Use As Required; Bolt 5t***56 Plate To Cover Gp 4n***72 | 8 |
| 11***87 | Seal-O-Ring (23.16 mm Id) | 1 |
304-6674 Kit-Hardware
| 03***19 | Bolt; --To Bearing Ret. At Lower Front Shaft Bore | 11 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 1 |
| 0S***71 | Screw,Cap,Hexagon; Tube Assembly To Turbocharger And Elbow Mounting | 3 |
Engine Arrangement
309-4515 Conversion Ar-Engine
| 03***79 | Seal-O-Ring (Id=10.82mm) | 1 |
| 0R***80 | Rod As-Connecting | 1 |
| 0R***87 | Camshaft As | 1 |
308-7318 Conversion Ar-Engine
| 03***79 | Seal-O-Ring (Id=10.82mm) | 1 |
| 0R***80 | Rod As-Connecting | 1 |
| 0R***87 | Camshaft As | 1 |
Fuel System
9y-1234 Fastener Gp-Fuel Inj Pump -Governor
| 1B***16 | Bolt; (1/4-20x5-In) | 2 |
| 4F***57 | Screw,Cap,Hexagon H Shock Mount To Bracket | 2 |
| 5B***40 | Bolt; (1/4-20x1-In) | 2 |
7c-4797 Governor Gp
| 03***16 | Bolt-Self Locking; (1/4unc X 3/4) | 3 |
| 0S***47 | Bolt; (1/4-20x0.75-In)(Drilled Head) | 2 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 1 |
108-6633 Pump Gp-Fuel Injection
| 10***02 | Bonnet-Valve | 1 |
| 10***04 | Plunger & Barrel As | 1 |
| 10***33 | Pump Group-Fuel Injection | 1 |
104-4409 Pump Gp-Fuel Injection
| 0S***15 | Bolt 19 mm (.75 In.) Long Return Air Console To Enclosed Rops | 14 |
| 10***09 | Pump Group-Fuel Injection | 1 |
| 10***52 | Camshaft-Fuel Pump | 1 |
2w-8628 Torque Control Gp
| 1P***52 | Insulator,Bushing Governor | 1 |
| 2P***85 | Spacer (.635 mm Thk); (0.635-mm Thk) | 1 |
| 2W***34 | Bar-Load Stop; (4.0mm Thk) | 1 |
Service Equipment And Supplies
308-7320 Kit-Engine Parts
| 06***40 | Seal-O-Ring (Id=37.69mm) | 1 |
| 10***48 | Ring-Guide | 1 |
| 10***49 | Plate | 1 |
309-4516 Kit-Engine Parts
| 03***46 | Elbow, 90 Deg Adj., 1/4in. J.I.C. X 7/16in.-14 Str. Thd. | 1 |
| 06***40 | Seal-O-Ring (Id=37.69mm) | 1 |
| 10***48 | Ring-Guide | 1 |
308-7319 Kit-Engine Parts
| 06***40 | Seal-O-Ring (Id=37.69mm) | 1 |
| 10***48 | Ring-Guide | 1 |
| 10***49 | Plate | 1 |
Frequently asked questions
What engine is used in the Caterpillar 826C?
The 826C is powered by a Caterpillar 3406 6-cylinder turbocharged diesel engine, providing approximately 315 hp net power.
What is the standard operating weight of this model?
The standard operating weight for the Caterpillar 826C compactor is approximately 69,732 lb (31,625 kg).
What models replaced the 826C?
The 826C was part of a lineage that includes later generations such as the 826G and the much more modern 826K landfill compactor.
What 826C owners discuss
What are the common symptoms of transmission issues on an 826C?
What engine model is used in the Caterpillar 826C?
What are the typical hydraulic and cooling fluid capacities for this machine?
What electrical components are standard on the 826C?
What should be checked when inspecting a used 826C for purchase?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific 826C part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.