Caterpillartrack-type tractor

Caterpillar D5G LGP

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar D5G LGP is a low-drive track-type tractor in the small dozer class, powered by the Cat 3046T engine producing 99 hp gross and 90 hp net. It weighs approximately 9,269 kg (20,434 lb) in the LGP configuration and was produced from 2002 to 2003. It succeeded the D5C and was later replaced by the D5K. Configurations included XL and LGP undercarriages with straight or PAT blades.

The D5G marked a shift to a hydrostatic drivetrain, replacing the D5C's powershift system. This generation improved maneuverability and grading precision. In the used market, it remains relevant for finish grading and confined sites due to its mechanical simplicity and lower operating costs compared to larger machines. Parts availability is supported by its lineage with the D3G and D4G.

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 D5G LGP specifications

Engine

Engine Model	Cat 3046T
Emissions Standard	EEC 80/1269
Gross Power	99 hp (74 kW)
Net Power	90 hp (67 kW)
Power Measured @	2200 rpm
Displacement	305 cu in (4998 cc)
Bore	3.7 in (94 mm)
Stroke	4.7 in (119 mm)

Weights

Operating Weight - LGP	20434 lb (9269 kg)
Operating Weight - XL	19662 lb (8919 kg)
Operating Weight - Standard	20547 lb (9320 kg)

Dimensions

Length w/ Blade	4252 mm (13.96 ft)
Length w/o Blade	3184 mm (10.45 ft)
Width Over Tracks	2387 mm (7.83 ft)
Height To Top Of Cab	2728 mm (8.95 ft)
Ground Clearance	384 mm (1.26 ft)
Length Of Track On Ground	2317 mm (7.58 ft)
Track Gauge - LGP	1727 mm (5.67 ft)
Track Gauge - XL	1549 mm (5.09 ft)
Standard Shoe Size - LGP	660 mm (26 in)
Standard Shoe Size - XL	508 mm (20 in)
Number Of Shoes Per Side	39
Number Of Track Rollers Per Side	7
Ground Contact Area - LGP	4741 in2 (3.06 m2)
Ground Contact Area - XL	3663 in2 (2.37 m2)

Performance

Transmission Type	Hydrostatic
Number Of Forward Gears	1
Number Of Reverse Gears	1
Max Speed - Forward	5.6 mph (9 km/h)
Max Speed - Reverse	6 mph (9.7 km/h)
Ground Pressure - LGP	4.31 psi (29.7 kPa)
Ground Pressure - XL	5.37 psi (37.1 kPa)
Relief Valve Pressure	2900 psi (20000 kPa)
Pump Flow Capacity	16.1 gal/min (61.1 L/min)

Blades

Blade Width - LGP	3254 mm (128.1 in)
Blade Width - Intermediate	115 in (2921 mm)
Blade Width - XL	105.9 in (2690 mm)
Blade Height - LGP	40.5 in (1029 mm)
Blade Height - Intermediate	40.5 in (1029 mm)
Blade Height - XL	43.3 in (1100 mm)
Blade Capacity - LGP	3.1 yd3 (2.4 m3)
Blade Capacity - Intermediate	2.8 yd3 (2.1 m3)
Blade Capacity - XL	2.9 yd3 (2.2 m3)
Digging Depth - LGP	22.9 in (582 mm)
Digging Depth - Intermediate	22.9 in (582 mm)
Digging Depth - XL	24.8 in (630 mm)
Blade Angle	25 degrees (Both Directions)

Service Capacities

Fuel Capacity	48.6 gal (184 L)
Cooling System Fluid Capacity	4.3 gal (16.1 L)
Engine Oil Capacity	3.4 gal (12.9 L)
Hydraulic Fluid Capacity	12 gal (45.5 L)
Final Drives Fluid Capacity - LGP	5.7 gal (21.6 L)
Final Drives Fluid Capacity - XL	3.9 gal (14.8 L)
Operating Voltage	12 V
Alternator Supplied Amperage	120 amps

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

D5G LGP fluids & capacities

System	Capacity	Recommended fluid
Engine Crankcase	13 l (3.4 gal)	Cat DEO or TDT oil meeting Cat TO-2 specification
Cooling System	16.1 l (4.25 gal)	Cat ELC coolant
Fuel Tank	187 l (48.6 gal)	Ultra-low sulfur diesel
Transmission/Hydraulic Tank	46.5 l (12 gal)	Cat HYDO Advanced or HYDO ELC hydraulic oil
Final Drives (Each)	21.5 l (5.7 gal)	Cat Multi-purpose gear oil meeting Cat TO-4 specification
Grease	N/A	Cat EPM or equivalent lithium-complex grease

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

Caterpillar D5G LGP maintenance schedule

Service interval	Tasks
Every 10 h	Check engine oil level. Check hydraulic fluid level. Check coolant level. Drain water from fuel separator. Check air filter restriction indicator. Inspect for fluid leaks.
Every 250 h	Change engine oil and filter. Grease all points (blade, push arms, ripper, pivots). Check fluid levels. Perform visual inspection. Service air filter. Check belts and hoses.
Every 500 h	Replace fuel filter. Replace hydraulic return filter. Service battery. Perform detailed undercarriage inspection. Test coolant with SCA. Drain and replace fuel filter/water separator.
Every 1,000 h	Take hydraulic oil sample (S.O.S). Change final drive oil. Inspect turbocharger. Torque ROPS bolts. Measure undercarriage wear. Check cutting edge and end bit bolt torque.
Every 2,000 h	Change hydraulic oil. Flush and replace coolant. Service transmission/torque converter. Perform comprehensive structural inspection. Evaluate major components. Replace hydraulic oil sample analysis follow-up.

Servicing the D5G LGP beyond the schedule

Predictive Maintenance & Fluid Analysis

Integrate S.O.S fluid analysis into the 1,000-hour interval to monitor engine oil, hydraulic fluid, and coolant for wear metals and contamination. The 3046T engine requires strict adherence to coolant SCA levels to prevent liner pitting. Hydraulic system integrity is critical; sample the hydraulic oil at 1,000 hours to detect pump and valve wear before failure. Use Cat DEO or TDTO fluids for engine oil and HYDO Advanced for hydraulics to ensure component longevity and warranty compliance.

Corrective & Common Repairs

Address hydrostatic drive system leaks by inspecting high-pressure lines and motor seals regularly. The 3046T engine's turbocharger requires inspection at 1,000 hours for shaft play and carbon buildup. Replace the hydraulic return filter at 500 hours to protect the pilot control valves. Check the final drive oil for gear wear metals at 1,000 hours. Inspect the air cleaner primary element daily in dusty conditions and replace at 500 hours to prevent engine ingestion.

Overhaul & Rebuild Points

Plan undercarriage overhaul based on wear measurements taken at 1,000-hour intervals. The LGP configuration uses 39 shoes per side; replace track links and bushings when elongation exceeds limits to protect rollers and idlers. Engine overhaul is driven by oil analysis trends and compression tests. The hydrostatic transmission may require pump or motor rebuild if pressure relief settings drop below 2,900 psi. Structural inspection at 2,000 hours identifies frame cracks near the C-frame and blade pivot points.

Seasonal & Environment Servicing

In cold climates, verify coolant freeze protection and use low-temperature hydraulic fluids to maintain pump flow. Clean radiator and oil cooler fins daily in dusty or sandy environments to prevent overheating. Shorten air filter service intervals to 500 hours in high-dust conditions. In hot climates, optimize hydraulic oil drain intervals and check for coolant degradation. Ensure the cooling system is flushed at 2,000 hours to remove silicate gel and corrosion inhibitors depletion.

D5G LGP fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
CID 0041 FMI 03	Sensor Power Supply (8-Volt DC) — Voltage Above Normal	Short to power on the 8-volt reference circuit; common on sensors sharing this supply.	Inspect wiring harness for damage; disconnect sensors one at a time to isolate the shorted component.
CID 0041 FMI 04	Sensor Power Supply (8-Volt DC) — Voltage Below Normal	Short to ground on the 8-volt reference circuit.	Disconnect sensors sharing the 8-volt supply sequentially to locate the fault.
CID 0091 FMI 02	Throttle Position Sensor — Erratic/Intermittent Data	Loose connector, damaged wiring, or failing sensor element.	Check sensor connector pins for corrosion; verify wiring integrity; replace sensor if circuit is good.
CID 0110 FMI 03	Engine Coolant Temperature Sensor — Voltage Above Normal	Open circuit in sensor wiring or failed sensor.	Check wiring harness for breaks; replace sensor if circuit continuity is verified.
CID 0190 FMI 08	Engine Speed Sensor — Abnormal Frequency	Incorrect air gap, damaged tone ring, or failing sensor.	Check sensor mounting gap; inspect tone ring for damage; test sensor output.
CID 0248 FMI 02	Cat Data Link — Erratic/Intermittent Data	Loose connection at the diagnostic test bank or damaged CAN bus wiring.	Check harness code connector termination; inspect wiring for chafing or damage.
CID 0017 FMI 07	Solenoid Valve (Fuel Shutoff) — Mechanical System Not Responding	Stuck solenoid plunger or mechanical binding in the fuel shutoff valve.	Check electrical signal to solenoid; manually actuate valve if possible; replace valve if stuck.
CID 0262 FMI 05	5-Volt Supply — Current Below Normal (Open Circuit)	Open circuit in the 5-volt reference supply line.	Check wiring harness for breaks; identify which 5-volt sensor is disconnected or failed.

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

D5G LGP attachments & work tools

Blades

The D5G LGP is equipped with a standard semi-U blade measuring 3.26 m (10.7 ft) in width with a capacity of 2.37 m³ (3.1 yd³). Variations include straight (S), semi-U (SU), and angle (A) blade types, with VPAT availability determined by specific machine configuration and serial number.

Rippers

The D5G LGP supports parallelogram ripper configurations, with availability dictated by the machine's serial number prefix (FDW for LGP). Multi-shank and single-shank options exist for this class, with weights varying by configuration and series.

Winches

A hydrostatic winch is available as an option on the D5G LGP, identified by the CSK arrangement prefix in the parts manual. This winch class is designed for towing applications and integrates with the machine's hydraulic system.

Drawbars/counterweights

Drawbar and counterweight specifications vary by configuration and series. Specific weights and attachment points are defined by the machine's serial number and intended work tool compatibility.

Cab/ROPS guarding options for forestry/waste configs

Forestry and waste configuration guarding options are available for the D5G LGP. Specific ROPS and guarding details vary by configuration and series.

Hydraulic arrangement notes for front/rear tools

The D5G LGP utilizes a hydrostatic transmission with a hydraulic relief valve pressure of 199.9 bar (2900 psi) and a pump flow capacity of 60.9 L/min (16.1 gal/min). Front and rear tool hydraulic arrangements are determined by the specific machine configuration and serial number.

All D5G LGP assemblies by section

Every catalogued assembly group for the Caterpillar D5G LGP. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Machine Arrangement

0a-0000 Chart-Commonality

0A***00

Chart-Commonality

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

D5G LGP serial number reference

The product identification plate is located on the right side of the operator's station, near the ROPS frame. The prefix is the first three alphanumeric characters of the 17-character PIN (ISO 10261 standard) or the first three characters of the older 8-character serial number.

Prefix	Identifies	Notes
FDW	D5G LGP	ECM flash file cross-reference assigns FDW to D5G LGP (range 1-467). Confirm with dealer for exact end-range boundaries.
WGB	D5G LGP	Parts manual SEBP3827-27 lists WGB1-UP for D5G LGP Track-Type Tractors. Identification guide for Cat serial number prefixes assigns WGB to D5G LGP. Confirm with dealer for exact start-range boundaries.
RKG	D5G LGP	Parts manual SEBP3827-27 lists RKG1-UP for D5G LGP Track-Type Tractors. Identification guide for Cat serial number prefixes assigns RKG to D5G LGP. Confirm with dealer for exact start-range boundaries.

Frequently asked questions

What engine does the D5G LGP use?

The Caterpillar D5G LGP uses the Cat 3046T engine, which produces 99 hp gross and 90 hp net power at 2,200 rpm.

What is the operating weight of the D5G LGP?

The operating weight of the D5G LGP is approximately 9,269 kg (20,434 lb), varying slightly by configuration and attachment package.

What model replaced the D5G LGP?

The D5G LGP was succeeded by the D5K series, which continued the low-drive size class with updated emissions compliance and drivetrain options.

What D5G LGP owners discuss

What is the engine designation and power output for the Caterpillar D5G LGP?

The D5G LGP uses the Caterpillar 3046T engine. Gross power is 99 hp (74 kW) and net power is 90 hp (67 kW), measured at 2200 rpm. The engine displacement is 305 cu in (4,998 cu cm). Variations in power ratings may occur depending on the specific emissions configuration or serial range.

How does the D5G LGP transmission behave, and what are common hydraulic or sensor failures?

The machine utilizes a hydrostatic transmission with one forward and one reverse gear, reaching a maximum speed of 9–10 kph (6 mph). Common issues include variable speed control failures and unresponsive dashboard gauges. A frequent root cause is a disconnected speed sensor on the left-hand drive motor. Additionally, the charge pump coupling between the front and rear hystat pumps is known to fail on certain serial ranges, requiring dealer verification for repair procedures.

What are the typical undercarriage wear patterns and life expectancy for the D5G LGP?

The LGP configuration features 39 track shoes per side with a standard shoe width of 26 in (66 cm), providing a ground pressure of 4.4 psi. The undercarriage life expectancy is approximately 4,000 hours. Wear patterns typically show sprocket teeth nearing end-of-life when track shoes are fully worn. Running the machine on hard ground with LGP pads is considered inefficient and accelerates wear.

What are the known fuel system quirks for the D5G LGP?

A common issue involves debris trapping in the elbow fitting located between the fuel tank and the incoming side of the fuel filters. This contamination often causes the machine to stall or run poorly after 7 to 9 hours of operation, particularly when pushing dirt on inclines. Regular cleaning of this specific elbow fitting is recommended to prevent fuel starvation.

What electrical or sensor issues are frequently reported by owners?

Owners report sudden machine shutdowns accompanied by a red exclamation warning light on the dashboard. Electrical faults often stem from wiring issues or carbon contamination in the ignition system. Additionally, transmission warning lights may illuminate due to sensor failures or low fluid levels in the final drives. All power loss symptoms should be traced to the diagnostic test bank accessible via the side access doors.

What is the recommended fluid specification for the hydraulic system?

The hydraulic system requires advanced hydraulic oil meeting Caterpillar specifications, such as Cat HYDO. The total hydraulic fluid capacity is 45 l (12 gal). Drain intervals may be optimized using biodegradable hydraulic fluids or bio-based options in hot climates. Always verify the exact fluid grade with the dealer based on the machine's operating environment.

What should be checked when buying a used D5G LGP?

Verify the serial number prefix (WGB for LGP) to confirm configuration and access correct service literature. Inspect the charge pump coupling for signs of failure. Check the fuel system elbow for debris accumulation. Assess undercarriage wear, noting that sprockets often fail near the end of track shoe life. Ensure the variable speed control and dashboard gauges function correctly. Have your dealer verify the ECM flash file version and check for active fault codes related to the transmission and hydraulic systems.

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

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