Caterpillar D350C
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar D350C is a heavy-duty articulated dump truck designed for high-productivity hauling in rugged terrains. This machine features a 3306 diesel engine producing 257 hp and operates with a 6x6 configuration. It offers a heaped capacity of 26.82 yd³ (20.52 m³) and a rated payload of approximately 69,977 lb (31,743 kg). The chassis is characterized by a 19.33 ft (5.89 m) wheelbase and an overall width of 9.85 ft (3.00 m), making it suitable for demanding earthmoving and mining applications.
Across its production lifecycle, the D350C maintained a reputation for durability through its robust powertrain and standardized service intervals. In today's used equipment market, this model remains highly relevant due to the availability of reliable 3306 engine components and the predictable maintenance structure of the PM1-PM4 tiers. Its presence in the secondary market is driven by the demand for dependable mid-to-heavy class articulated trucks that can be integrated into existing fleets with minimal specialized tooling.
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 D350C specifications
Engine
| Engine Model | 3306 |
| Gross Power | 257 hp (191.7 kW) |
Weights
| Rated Payload | 31,741 kg (69,976.94 lb) |
Dimensions
| Overall Length | 9,950 mm (32.65 ft) |
| Overall Width | 3,000 mm (9.85 ft) |
| Overall Height | 3,330 mm (10.93 ft) |
| Wheelbase | 5,890 mm (19.33 ft) |
| Dump Height | 6,520 mm (21.4 ft) |
| Tire Size | 26.5x25 Radials |
Performance
| Travel Speed | 56 km/h |
| Capacity - Heaped | 20.5 m³ (26.82 yd³) |
| Capacity - Struck | 16 m³ (20.93 yd³) |
| Transmission Gears | 6 forward, 1 reverse |
Service capacities (summary)
| Fuel Capacity | 118.9 gal (450 L) |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
D350C fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Engine Crankcase | Not specified | Cat DEO (Diesel Engine Oil) or Cat DEO-ULS (for Tier 4 engines with aftertreatment); viscosity selection by temperature: SAE 10W-30 is preferred for ambient temperatures between -18°C (0°F) and 40°C (104°F). Use SAE 5W-40 for -30°C to 40°C or SAE 50 for hot climates above 10°C. |
| Cooling System | Not specified | Cat ELC (Extended Life Coolant) |
| Fuel Tank | 450.06 L (118.9 gal) | Not specified |
| Transmission/Powertrain | Not specified | Cat TDTO (Transmission/Drive Train Oil); use Cat TDTO Cold Weather for operations below -25°C. |
| Final Drives | Not specified | Cat TDTO (Transmission/Drive Train Oil) |
| Hydraulic System and Tank | Not specified | Cat HYDO Advanced 10 (for cold to moderate temperatures) or Cat HYDO Advanced 30 (for moderate to hot temperatures). |
| Grease | Not specified | Cat Multipurpose Grease (low-load/low-speed), Cat Advanced 3Moly Grease (medium-load/medium-speed), or Cat Ultra 5Moly Grease (high-load/high-speed). |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar D350C maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the D350C beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Caterpillar S.O.S Services to monitor engine oil, hydraulic fluid, and coolant. Analyze wear metals like iron or copper and check for contaminants such as silicon (dirt) or sodium (coolant). Regular sampling during PM3 and PM4 intervals allows for detecting pump wear or bearing degradation before catastrophic failure occurs. Ensure any transition between fluids, such as switching to HYDO Advanced, maintains cross-contamination below 10%.
Corrective & Common Repairs
Address common failures by monitoring hydraulic hose abrasion and leaks. Frequent issues include fuel/water separator contamination and air filter restriction. If milky oil is detected on the dipstick, investigate immediate head gasket or coolant leak repairs. For electrical faults, use CID and FMI identifiers to diagnose electronic control module errors. Promptly replace worn pins and bushings in the articulation joint to prevent steering inaccuracies.
Overhaul & Rebuild Points
Plan major component evaluations during PM4 intervals. Key rebuild indicators include significant turbocharger wear, transmission slippage, or hydraulic pump cavitation. Monitor final drive oil for metal particles to determine gear replacement needs. Structural inspections should focus on weld integrity in the boom or chassis. For high-hour engines, evaluate piston and ring condition if oil consumption increases significantly during routine service.
Seasonal & Environment Servicing
In dusty or quarry environments, shorten air filter inspection to daily checks and replace elements at 500 hours instead of 1,000. Clean radiator and oil cooler fins daily to prevent overheating. For extreme cold, utilize Cat Arctic Platinum Grease and appropriate cold-weather engine oils. In high-load summer operations, monitor coolant SCA levels more frequently to prevent liner pitting and maintain thermal stability.
D350C common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 8M-3182 | Spring,Helical,Comp Engine Oil Filter Assembly | Lubrication service | Check fitment → |
| 2P-2537 | Stud Engine Oil Filter | Lubrication service | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
D350C fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| E360 | Engine Coolant Temperature — High | Low coolant level, failed thermostat, or water pump issue | Diagnose cooling system; do not operate until resolved |
| E361 | Engine Coolant Temperature — Very High (Shutdown) | Severe cooling system failure | Engine shutdown required; perform full cooling system diagnosis |
| 110-0 | Engine Coolant Temp — Above Normal | Low coolant level or thermostat failure | Inspect cooling system, refill coolant, and test thermostat |
| 110-3 | Engine Coolant Temp Sensor — Voltage High | Open circuit or sensor failure | Check wiring and replace sensor if confirmed 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 and tone ring |
| 2458-2 | DPF #1 Differential Pressure — Erratic | Plugged pressure ports or failing sensor | Clean pressure ports and test sensor; verify DPF soot load |
| 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.
D350C attachments & work tools
Dump Body Configurations
Available in steel or aluminum construction. Aluminum is recommended for handling abrasive materials to improve durability.
Payload and Capacity
Heaped capacity is 26.82 yd3 (20.5 m3) with a rated payload of 69,976.94 lb (31,741 kg). Struck capacity is 20.93 yd3 (16 m3).
Fluid Specifications
Engine oil requires DEO or DEO-ULS. Transmission systems use TDTO. Hydraulic systems require HYDO Advanced.
All D350C assemblies by section
Every catalogued assembly group for the Caterpillar D350C. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Basic Engine
284-7811 Kit-Hardware
| 0L***43 | Bolt 63.5 mm (3/8" X 2 1/2" -Cover Assembly To Fender | 1 |
| 0S***91 | Screw,Cap,Hexagon Bearing Retainer; Part Of Kit P/N 1w***82 | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 2 |
Engine Arrangement
284-3287 Conversion Ar-Engine
| 0R***14 | Rod As-Connecting | 1 |
| 0R***97 | Cylinder Pack Group | 6 |
| 0R***82 | Injector As | 6 |
Fuel System
7c-8993 Fastener Gp-Fuel Inj Pump
| 0S***14 | Bolt (.25" Diameter-.50" Long) | 3 |
| 2S***83 | Bolt (3.25" Long-Drilled Head) | 1 |
| 4F***57 | Screw,Cap,Hexagon H Shock Mount To Bracket | 8 |
111-5162 Control Gp-Fuel Ratio
| 10***93 | Washer | 1 |
| 11***62 | Control Group-Fuel Ratio (Basic) | 1 |
| 11***58 | Washer; (12.7x6.65x0.79-mm Thk) | 1 |
2w-2410 Governor Gp
| 03***16 | Bolt-Self Locking; (1/4unc X 3/4) | 3 |
| 0S***16 | Screw,Cap,Hexagon H Receptacle Mtg; Bolt Brackets To Firewall Assembly | 6 |
| 13***07 | Seal-Lip Type; (6.39mm) | 1 |
115-9595 Pump Gp-Fuel Injection
| 0S***15 | Bolt 19 mm (.75 In.) Long Return Air Console To Enclosed Rops | 4 |
| 11***18 | Seal-O-Ring; (26.64mm Id) | 6 |
| 11***95 | Pump Group-Fuel Injection | 1 |
4p-9827 Pump Gp-Fuel Injection
| 1W***87 | Valve As-Check; (Fuel Injection Pump) | 1 |
| 4P***27 | Pump Group-Fuel Injection | 1 |
| 4P***30 | Plunger & Barrel Assem. | 1 |
7c-8992 Seal Gp-Pump
| 03***79 | Seal-O-Ring (Id=10.82mm) | 1 |
| 14***77 | Gasket | 1 |
| 15***26 | Gasket | 1 |
1w-1597 Torque Control Gp
| 1P***52 | Insulator,Bushing Governor | 1 |
| 1W***97 | Torque Control Group | 1 |
| 2P***85 | Spacer (.635 mm Thk); (0.635-mm Thk) | 1 |
Service Equipment And Supplies
284-3299 Kit-Engine Parts
| 10***68 | Hose As | 1 |
| 10***69 | Tube As; (Oil) | 1 |
| 12***74 | Clip-Loop; (12.7mm Id) | 1 |
D350C serial number reference
The PIN plate is a durable metal identification plate usually riveted to the machine frame. To read the prefix, locate the first three alphanumeric characters at the start of the serial number string.
| Prefix | Identifies | Notes |
|---|---|---|
| 8XC | D350C Articulated Dump Truck | Covers serial number ranges 8XC00001-00404 and 8XC200 and up. Powered by 3306 engine. Includes configurations with 257 HP and 20 yard³ capacity. Features 6 forward gears and 1 reverse gear. Standard tires are 26.5x25 or 18.00R25. Fuel capacity is 119 gallons (450.47 L). Dimensions include approximately 32.65 ft (9.95 m) length, 9.14 m (30 ft) width, and 3.35 m (11 ft) height. Travel speed is 56 km/h. |
| BXC | D350C Articulated Dump Truck | Identify with dealer to confirm specific configuration and build year. |
Frequently asked questions
What engine powers the D350C?
The Caterpillar D350C is equipped with a 3306 diesel engine providing 257 hp.
What is the operating weight of this model?
The specific operating weight for the D350C is not explicitly documented in the provided technical data, though related heavy-class machines range from 9,182 lb to over 87,000 lb.
What machine replaced the D350C?
The provided documentation does not specify a direct successor for the D350C, though it lists the 745C and 740C as part of the Caterpillar articulated truck lineup.
What D350C owners discuss
What are the typical dimensions for a Caterpillar D350C articulated dump truck?
How does material type affect the choice of Caterpillar D350C construction?
What are common hydraulic system failure indicators in Caterpillar machines?
What electrical issues frequently cause unpredictable fault codes in Caterpillar equipment?
What engine symptoms should be monitored to prevent power loss?
What is a critical check when buying a used Caterpillar D350C?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific D350C part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.