Caterpillarwheel-type loaderwheel loader

Caterpillar 980F II

Maintenance schedule, common problems & OEM parts breakdown

The Caterpillar 980F II is a medium-to-large articulated wheel-type loader built for quarry, aggregate, and heavy construction loading duty. It runs a Cat 3406/3406C direct-injection, turbocharged diesel rated at roughly 224 kW (300 hp) gross, through a torque-converter powershift transmission. Standard operating weight runs about 27.7 t (61,046 lb), varying with bucket, counterweight, and tire selection. Cat built the F II from roughly 1991 to 1996 under serial prefixes 8JN, 4RN, and 5XJ, as the direct update to the earlier 980F and the direct predecessor to the 980G and later 980G Series II. Factory and dealer-supported configurations included general-purpose and rock buckets from about 3.8 to 5.4 cubic meters, a hydraulic multi-purpose bucket, pallet forks, a log grapple for forestry duty, and an optional ride-control system, all riding on 29.5-25 tires.

Series II changes over the plain 980F centered on hydraulic and monitoring refinements rather than a ground-up redesign, so the F II carries the same core 3406-family engine, torque-converter transmission, and axle driveline as the F it replaced, with updated controls and calibration carried into the mid-1990s. The following 980G brought a further engine and hydraulic update, which is why the F II remains its own distinct parts and service family rather than a stopgap between generations. In today's used and parts market, the 980F II holds up as an affordable, mechanically straightforward quarry and yard loader: the 3406/3406C engine, TO-4-family driveline fluids, and conventional torque-converter transmission are well understood by independent shops, and buyers favor it over later, more electronically dense G-and-newer machines for its comparatively simple repairability.

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 980F II specifications

Engine

Engine model	Cat 3406 diesel, in-line 6, turbocharged direct injection. Same base engine family carried through 980F and 980F Series II production; some references note an aftercooled variant for the Series II.
Displacement / cylinders	14.6 L (893 cu in), 6 cylinders in-line.
Gross power	Approx. 224 kW (300 hp) gross, per Series II spec listings.
Net power	Not consistently documented across available sources for this exact series — figures found conflict with the gross rating above. Confirm net flywheel rating with a dealer or OEM spec sheet before publishing a number.
Emissions tier	Built before U.S. off-highway diesel emissions tiers took effect. A factory emissions-upgrade retrofit to a Tier 1 equivalent level was later offered for the 3406 engine used across 980C, 980F and 980F Series II loaders.

Weights

Operating weight	Approx. 27.7 t / 61,046 lb (about 27,690 kg) for the standard Series II configuration.
Shipping/transport weight	Reported in the 28-30 t (61,700-66,100 lb) range depending on bucket, counterweight and tire setup; treat the operating weight above as the base reference and confirm exact figure for your configuration.
Ground pressure	Not documented in available sources for this series — verify with dealer/OEM literature.

Dimensions

Transport length	Approx. 9.14-9.27 m (30'0"-30'5"), varies by source/configuration.
Transport width	Approx. 3.18-3.37 m (10'5"-11'1"), varies by source/configuration.
Transport height	Approx. 3.56-3.9 m (11'8"-12'9"), varies by source/configuration.
Hinge pin height, boom raised	Approx. 4.54 m (14'11") at full lift, per Series II spec listing.
Tire size	Standard 29.5-25 on an articulated-frame chassis; steering pivots at the center hitch rather than a conventional wheelbase.

Performance

Travel speed	Approx. 25-34.6 km/h (15.5-21.5 mph) top speed depending on gear range and tire/axle setup; figures vary by source.
Breakout force	Approx. 227-246 kN (51,000-55,300 lbf); figure varies by series/source.
Static tipping load, full turn	Approx. 21 t (46,300 lb), per Series II spec listing.
Bucket capacity range	Approx. 3.8-5.4 m3 (5.0-7.1 yd3) heaped, depending on bucket selection.

Service capacities (summary)

Engine oil	Approx. 28 L (7.4 US gal) refill capacity for the Series II 3406-powered configuration.
Hydraulic system	Reservoir approx. 125 L (33 US gal); total system including lines and cylinders approx. 208 L (55 US gal). Verify against the service manual for your specific machine.
Fuel tank	Not consistently documented in available sources for this exact series — check dealer/OEM literature for your serial range.
Cooling system	Not consistently documented in available sources for this exact series — check dealer/OEM literature for your serial range.

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

980F II fluids & capacities

System	Capacity	Recommended fluid
Engine crankcase (with filter) - Cat 3406C diesel	approx. 28 L (7.4 US gal) per a dealer fluid cross-reference guide built specifically for this machine/engine pairing; general 3406C engine-family sump specs quoted for other applications run higher, around 38-41 L (10-11 US gal) - capacity varies by oil pan/application configuration, confirm the exact figure against your OMM	Cat DEO (Diesel Engine Oil). Use SAE 15W-40 multigrade for moderate ambient ranges, SAE 10W for cold starts, and a heavier monograde (SAE 30/40) for sustained hot climates, per Cat's viscosity-by-ambient-temperature guidance. Change with every filter service.
Cooling system	not documented directly for the 980F II in available dealer literature; the closely related 980G, which carried the same basic driveline before the later air-to-air aftercooled engine update, lists approx. 79 L (20.9 US gal) - treat as an estimate for the 980F II and verify against your OMM, since capacity grew to roughly 90 L (23.8 US gal) once the aftercooled engine arrived on the following generation	Cat-approved heavy-duty antifreeze/coolant for this era of machine (glycol-based, additive-treated). Check your OMM's coolant chart to confirm whether it calls for a conventionally treated coolant with periodic supplemental additive service or a long-life formulation, and follow the listed additive/extender service interval.
Fuel tank	not confirmed directly for the 980F II; the shared-chassis 980G lists a standard tank near 469-470 L (124 US gal), which is likely representative for the 980F II - confirm the exact figure against your OMM, especially if a high-capacity tank option was fitted	No. 2-D diesel fuel meeting the applicable diesel fuel specification for on/off-highway diesel engines. Use a winterized or No. 1-D blend in cold ambient conditions per the OMM's fuel chart.
Transmission (powershift)	62 L (16.4 US gal)	Cat TDTO (Transmission/Drive Train Oil). Use SAE 10W in cold climates, SAE 30 in warm climates, or a TDTO multigrade product across a wider temperature range. The wet-disc service brakes draw from this same drivetrain oil supply on this machine.
Final drive / differential - front axle	87 L (23 US gal)	Cat TDTO, with viscosity selected by ambient temperature as noted for the transmission.
Final drive / differential - rear axle	81 L (21.4 US gal) per the dealer fluid guide sourced for this exact machine; spec material for the closely related 980G generation rounds this to about 87 L - minor variance across sources, confirm against your OMM	Cat TDTO, same viscosity guidance as the transmission and front axle.
Hydraulic system (including tank)	208 L (55 US gal) total system; the hydraulic tank alone holds 125 L (33 US gal)	A dealer fluid cross-reference built for this exact machine lists a 15W-40 heavy-duty diesel engine oil equivalent for the hydraulic reservoir. Cat's broader lineup of this era otherwise specifies Cat TDTO for transmission, differential, and hydraulic compartments - confirm which fluid your OMM's chart calls out for the hydraulic tank specifically, since guidance differs by source.
Grease (all fittings, spec only)	not applicable - lubricate per the OMM's grease-point schedule and interval	Cat multipurpose grease, NLGI 2, moly-fortified EP-type formulation.

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

Caterpillar 980F II maintenance schedule

Service interval	Tasks
Every 50 h	Check engine oil, coolant, and hydraulic tank sight-gauge level before starting; walk-around for fresh leaks at the lift/tilt cylinders and hoses. Drain water and sediment from the fuel tank and primary fuel filter/water separator. Inspect tires for cuts and correct inflation and check wheel-rim nut torque. Grease the loader linkage, bucket pivot, and tilt-lever pins on the weekly cycle. Check articulation-hitch and steering-cylinder pin lubrication. Test service brakes and the parking brake before putting the machine to work.
Every 250 h	Change engine oil and filter on the 3406/3406C and pull an oil sample for analysis. Check transmission oil level and pull a fluid sample from the powershift transmission. Clean the radiator core and engine compartment of packed debris. Check alternator and fan belt tension and condition. Grease the center articulation hitch and axle-oscillation pins.
Every 500 h	Change the transmission oil filter. Sample front and rear final-drive oil for wear metals and water content. Check final-drive oil level front and rear. Inspect the turbocharger for shaft play and boost leaks. Check coolant condition and corrosion-inhibitor level. Inspect service-brake components and adjust as needed.
Every 1,000 h	Change the transmission oil and filter completely. Change front and rear final-drive oil. Replace hydraulic-system filter elements. Check torque-converter oil condition and pressure. Retorque wheel-rim and axle-housing mounting bolts. Inspect steering-cylinder pins and bushings for wear.
Every 2,000 h	Change hydraulic-tank oil and inspect the system for contamination. Change engine coolant and flush the cooling system. Check the torque-converter stator one-way clutch and friction plates for wear trends. Check articulation bearings and center-hitch pins against service wear limits. Verify electronic monitor and gauge-cluster readings against known-good values.
Every 4,000 h	Inspect hydraulic hoses for age-related cracking and replace as due, regardless of visible condition. Inspect final-drive planetary gear sets and carriers for wear. Check cylinder-head valve lash on the 3406/3406C and adjust to spec. Inspect engine and radiator mounts for fatigue cracking.
Every 6,000 h	Perform an engine top-end inspection (injectors, valve train, turbocharger) and plan inframe work from oil-analysis trends rather than a fixed hour count. Check main- and rod-bearing wear indicators via oil sampling before committing to an engine overhaul. Rebuild or inspect the differential and planetary carriers on both final drives if wear limits are exceeded. Inspect the articulation hitch and center-frame pins and bushings for wear beyond factory limits. Overhaul the hydraulic pump and lift/tilt cylinders as dictated by condition monitoring, not a calendar date.

Servicing the 980F II beyond the schedule

Predictive Maintenance & Fluid Analysis

Sample engine, transmission, and front/rear final-drive oil at every scheduled interval on the 3406/3406C powertrain; rising iron or copper in a transmission sample often shows up before a clutch pack fails outright. Pull and inspect the transmission oil screen for clutch material at the first sign of gear slip rather than waiting for a full failure. Track hydraulic-tank condition and filter life, since contamination-driven valve and pump wear is the long-run failure path once this loader has real hours on it.

Corrective & Common Repairs

Gear slip or a gradually disappearing gear on the powershift transmission usually traces to clutch material clogging the oil screen, not a control-valve fault; check the screen before deeper teardown. The 3406/3406C's multi-piece cylinder-head gasket is a known aging leak point, and turbocharger shaft play shows up as gradual power loss and smoke. Sluggish lift and tilt response is most often low hydraulic fluid, a worn main pump, or suction-side air rather than a valve problem.

Overhaul & Rebuild Points

Plan inframe work on the 3406/3406C around cylinder-liner, injector, and turbocharger condition rather than a fixed hour count, and recheck injection-pump timing after any rebuild, since white smoke afterward usually means a timing issue, not a bad short block. Torque-converter and transmission overhauls typically address the stator one-way clutch and friction plates. Z-bar lift-arm, bucket-pivot, and articulation-hitch pins and bushings are the major structural wear points needing bushing and pin replacement once play develops.

Seasonal & Environment Servicing

Use the factory ether cold-start system as designed: short metered shots while cranking, not extra starting fluid dumped on top, which risks cracked pistons or bent rods on this direct-injection engine. Persistent hard starting above freezing points to a compression or injection-timing fault, not a starting-routine fix. Match engine-oil viscosity and coolant protection to ambient temperature before winter work. In dusty quarry or demolition service, shorten air-filter and hydraulic-breather checks and wash packed debris from the radiator core and Z-bar/articulation pivot points.

980F II fault codes & troubleshooting

Code	Meaning	Likely cause	What to do
Engine Oil Pressure warning lamp	Indicates engine oil pressure has dropped into the gauge red zone or below the safe minimum for current engine speed.	Low oil level, worn oil pump or relief valve, plugged suction screen, or a failed oil pressure sender/wiring fault.	Stop the engine safely, check oil level and condition, inspect the sender and wiring before further operation.
Coolant Temperature warning lamp	Indicates engine coolant temperature has risen into the gauge red zone, signaling overheating.	Low coolant level, plugged radiator core, slipping or failed fan drive, faulty thermostat, or a defective coolant temperature sender.	Reduce load and monitor, check coolant level and radiator/fan condition once safe to inspect, verify sender and wiring if the reading looks erratic.
Fuel Pressure/restriction warning	Flags fuel supply pressure below normal to the injection pump, shown on the fuel pressure gauge or a dedicated warning light.	Plugged primary or secondary fuel filter, air in the fuel system, or a failing fuel transfer pump.	Check fuel filters and lines for restriction, bleed air from the system, inspect the transfer pump if filters are clean.
Transmission/Torque Converter Oil Temperature warning lamp	Indicates torque converter and powershift transmission oil temperature has risen above the normal operating range.	Low transmission oil level, plugged oil cooler, worn clutch packs causing excess slippage, or sustained high-load/stall operation.	Reduce load and allow the converter to cool, check transmission oil level and cooler for restriction, have clutch and converter condition checked if overheating repeats.
Charging System warning lamp	Indicates the alternator is not maintaining proper charging voltage to the batteries.	Worn or slipping alternator belt, failed alternator or regulator, or a loose/corroded battery or charging circuit connection.	Check belt tension and condition, inspect battery terminals and charging circuit wiring, test alternator output.
Parking Brake warning lamp	Indicates the parking brake is applied or that the parking brake circuit has detected a fault.	Parking brake left engaged, low brake system pressure, or a faulty parking brake switch or solenoid.	Confirm parking brake lever position, check brake system pressure, inspect the parking brake switch and wiring if the lamp stays on with the brake released.
Service Brake Hydraulic Pressure warning lamp	Indicates service brake accumulator pressure has dropped below the safe operating threshold.	Brake system leak, failed charging pump, or a faulty pressure switch.	Stop the machine safely, check brake accumulator pressure and the system for leaks, inspect the pressure switch and charging pump.

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

980F II attachments & work tools

General-purpose & rock buckets

Standard work tool for this loader class is a general-purpose bucket in roughly 3.8-5.4 m3 (5.0-7.1 yd3), about 3.35-3.4 m wide; exact figure varies by configuration/series and tire fitment. A narrower spade-edge rock bucket with pinned (not welded) wear plates is offered for abrasive quarry and aggregate loading.

Multi-purpose (4-in-1) bucket

A hydraulically clamping multi-purpose bucket is available in this size class for combined dozing, grading, clamping, and general loading duty, in a capacity range close to the general-purpose bucket. Operating the clamshell jaw needs the machine's third (bucket-clamp) hydraulic circuit.

Pallet forks

Pin-on pallet forks sized for this loader's lift and tipping-load class handle standard palletized loads on a carriage-style fork frame. Fixed and swing-tine frame variants are offered by attachment builders serving this size of wheel loader.

Forestry / log handling

A log grapple attachment is documented specifically for this loader platform, fitted in place of the bucket on the standard lift arms for log and pulpwood yard handling. Forestry duty on this size machine typically pairs the grapple with added underside and cab guarding.

Mounting / coupler system

Factory standard is a fixed pin-on bucket and fork mount on Z-bar lift linkage; this size class was not offered as a Cat integrated toolcarrier, so parallel-lift quick-coupler geometry was not a factory arrangement. Aftermarket quick-coupler kits (JRB-style hook-and-pin interfaces and similar) are commonly retrofitted, and the coupling hardware is shared across this loader and its immediate next-generation siblings.

Ground-engaging tools / cutting edges

Buckets for this class use bolt-on or pinned reversible cutting edges rather than welded edges, so edges can be changed without cutting or welding. Rock-application buckets add edge and side-plate wear protection for high-abrasion loading.

Ride control

A hydro-pneumatic ride control system is offered as a factory hydraulic option on this size of wheel loader; it damps boom bounce from a loaded bucket over rough haul roads for smoother, faster travel. Availability by exact serial range should be confirmed with era-correct dealer literature.

Guarding and severe-application packages

Factory-available protection for this class includes power-train guarding, radiator/rear guarding, counterweight, secondary steering, and sound suppression aimed at quarry and industrial use. Heavier industrial/waste-handling guarding (transfer station, scrap yard, demolition) is a documented arrangement for Cat loaders in this size class; exact package content varies by configuration/series.

Tires

Radial tires (an L4 rock-service tread in the 29.5R25 size class) are the common fitment, with bias-ply alternatives also listed on the tire option chart for this loader. Tire choice changes static tipping load and breakout force, so bucket and fork sizing is matched to the tire option actually fitted.

All 980F II assemblies by section

Every catalogued assembly group for the Caterpillar 980F II. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.

Basic Engine

304-6674 Kit-Hardware

Engine Arrangement

304-6660 Conversion Ar-Engine

03***79	Seal-O-Ring (Id=10.82mm)	1
0R***80	Rod As-Connecting	1
0R***87	Camshaft As	1
0R***72	Crankshaft As	1

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

304-6669 Conversion Ar-Engine

Fuel System

9y-1234 Fastener Gp-Fuel Inj Pump -Governor

7c-4797 Governor Gp

108-6633 Pump Gp-Fuel Injection

104-4409 Pump Gp-Fuel Injection

2w-8628 Torque Control Gp

Service Equipment And Supplies

304-6665 Kit-Engine Parts

307-2967 Kit-Engine Parts

304-6662 Kit-Engine Parts

980F II serial number reference

On the 980F and 980F Series II, the PIN (Product Identification Number) plate is riveted to the front frame rail, right-hand side, forward of the cab near the articulation hitch/pivot. Stand at the loader's center pivot point to read it. The first three characters of the PIN are the serial-number prefix, identifying the model/arrangement and assembly plant. The digits that follow are the sequential unit number for that prefix (example: 8JN00001 is the first unit built under the 8JN prefix).

Prefix	Identifies	Notes
8JN	980F Series II (980F II)	Serial range 8JN00001 and up, sold new from the early-to-mid 1990s. Fitted with the Cat 3406C direct-injection diesel. Factory service and parts literature titles this range specifically as the 980F Series II, not plain 980F.
4RN	980F Series II (980F II)	Serial range starts at 4RN00001 and up. A real dismantled 1995 production unit carries S/N 4RN00650 and is catalogued as a 980F II, confirming the range was in the field by that model year. Fitted with the Cat 3406C direct-injection diesel, matching the rest of the 980F II line. Factory electrical-system documentation and separate parts-catalog listings title this range 980F Series II.
5XJ	980F Series II (980F II), from unit 00713 and up only	This is a split prefix. 5XJ00001 through 5XJ00712 are plain 980F. Machine-arrangement documentation retitles the line 980F Series II starting at 5XJ00713 and up, same Cat 3406 diesel. Confirm the exact break with your dealer before ordering series-specific parts - the 712/713 point comes from catalog machine-arrangement listings, not a printed manual cover.

Frequently asked questions

What engine does the Caterpillar 980F II use?

The 980F II runs a Caterpillar 3406/3406C direct-injection diesel with turbocharging, rated at roughly 224 kW (300 hp) gross. It is the 3406 engine family carried through 980F II production under the 8JN, 4RN, and 5XJ serial prefixes.

What is the operating weight of the Caterpillar 980F II?

Operating weight is about 27.7 t (61,046 lb), varying with bucket choice, counterweight, and tire selection across the general-purpose, multi-purpose, and forestry configurations Cat supported on this loader.

What replaced the Caterpillar 980F II?

Caterpillar replaced the 980F II with the 980G, later updated to the 980G Series II. The G-series carried the same wheel-loader concept forward with a further engine, hydraulic, and electronic-monitoring update.

What 980F II owners discuss

What transmission behavior do 980F II owners commonly report as the machine racks up hours?

Two patterns show up most on this loader: slipping out of forward gear under load, and a gradual loss of one gear (commonly 2nd) in both directions. In both cases the root cause traced back to clutch material collecting in the transmission oil screen and restricting flow to that clutch pack. Pull and inspect the screen before assuming a control valve or solenoid fault. If the screen is clean and the slip persists, have your dealer pressure-test the transmission clutches and torque converter.

Hydraulics feel sluggish on lift and tilt. What's the usual cause?

Lazy or hesitant arm and bucket movement under load on a loader this age is almost always low hydraulic oil, a worn main pump, or air drawn in on the suction side. Check fluid level and filter condition first, since contamination-driven valve wear is the common long-term failure mode once a machine has racked up hours. Sluggishness that persists after a fluid and filter service points to pump wear and needs a dealer flow-and-pressure test.

Where does the loader linkage wear first on this type of machine?

The Z-bar lift arm-to-tower pin and the bucket pivot pins and bushings carry the highest cyclic load and are the first place a knock or squeal shows up, especially on machines run in mud, demolition rubble, or abrasive material. The articulation center pin and steering cylinder mounts wear the same way and show up as vague, wandering steering. Regular greasing on schedule slows this. Once a pin has worn enough to spin in its bore, greasing only buys a little time and the pin and bushing need replacing.

What engine quirks come up specifically with the 3406/3406C direct-injection engine in the 980F II?

The cylinder head uses a multi-piece gasket set that is a known leak point as the engine ages. Turbocharger shaft play and blade wear are the other common failure, showing up as gradual power loss and smoke. White smoke after a rebuild or injection pump service usually points to unburned fuel from incorrect injection pump timing, not a ring or bearing problem, so recheck timing before condemning the short block. Overheating on this engine is more often a plugged radiator, worn water pump, or a collapsed lower hose than a head gasket failure.

What electrical gremlins show up on the 980F II?

Gauge and monitor faults on this generation trace back to the wiring harness more often than the sensor itself. Chafed insulation near the engine, heat-damaged wire close to the exhaust manifold, and corroded or loose connector pins cause intermittent readings that look like a bad sender. Visually trace the harness back to the gauge cluster before swapping sensors on a hunch.

Is it safe to lean on starting fluid to get a hard-starting 980F II running in cold weather?

The factory cold-start system meters a short, controlled shot of ether and is fine when used as intended: a brief spray while cranking, with a pause between shots. Dumping extra ether from a can on top of that, or using it to mask a real problem, risks detonation on a direct-injection diesel and can crack pistons or bend rods. If the engine needs ether to start once temperatures are above freezing, treat that as a symptom of a compression, injection-timing, or fuel-delivery fault, not a starting routine. Have your dealer diagnose and verify before you keep running it that way.

What should you check specifically when looking at a used 980F II?

Confirm the serial number falls in a documented production range for this model before trusting seller-supplied history. Cycle the hydraulics through full lift, tilt, and dump motions and watch for sluggish or lazy response under load. Check the Z-bar pins, bucket pivots, and articulation joint for play by rocking the linkage with the bucket loaded and grounded. Run the transmission through all gears in both directions and watch for slip, and pull the transmission oil screen if possible to check for clutch material. Watch engine blow-by and oil consumption, since worn rings and bearings on this engine reduce power and raise oil use gradually rather than failing outright. Have your dealer run a full hydraulic pressure and flow test plus a powertrain inspection before you commit to the purchase.

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

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