Caterpillar® Product Information

Salesgram

For Dealer Sales Personnel

December 1995

Caterpillar®

988F Series IIWheel Loader

Caterpillar Large Wheel Loaders will introduce the 988F Series IIthe first quarter of 1996. The 988F Series II features powertrain,operator station and other improvements to further lower the costper ton. Caterpillar 988F wheel loaders have been working aroundthe globe proving themselves as reliable, durable machines,backed by world class support. The following improvements to the988F Series II will further enhance our customer’s business andour commitment to them.(The serial number prefix will change to 2ZR from 8YG.)

988F Series II Improvements• 3408E engine • Service brake/axles• Operator station• Operator oriented enhancements• Buckets

Specifications

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Basic Specifications Comparison 988F 988F Series II

Power kW (hp) 298 (400) 321 (430)

Bucket Capacity m3 ( yd3) 6.0 (7.8) 6.15 (8.00)

Operating Weight kg (lb) 44 328 (97,727) 45 297 (99,857)

Breakout Force kg (lb) 37 363 (82,371) 37 399 (82,446)

Full Turn STL kg (lb) 25 595 (56,427) 27 603 (60,851)

Dump Clearance mm (ft-in) 3209 (10'-6") 3209 (10'-6")

Reach mm (ft-in) 1832 (6'-0") 1832 (6'-0")

Clearance Circle mm (ft-in) 17 356 (56'-11") 17 356 (56'-11")

Wheelbase mm (ft-in) 3810 (12'-6") 3810 (12'-6")

Height, top of ROPS mm (ft-in) 4157 (13'-7") 4157 (13'-7")

* All measurement with spade edge bucket with teeth, and std tires.

Improvements

A new, 430 horsepower 3408E turbocharged and aftercooledelectronic engine with HEUI (Hydraulically actuated,Electronically controlled Unit Injected) fuel system replaces thecurrent 400 horsepower 3408C turbocharged and aftercooledengine with camshaft driven mechanical scroll fuel system. The3408E HEUI engine features ADEM (Advanced Diesel EngineManagement) ECM (Electronic Control Module). Other 3408Eimprovements include new engine parts for increased reliabilityand durability. This new engine provides many uniqueadvantages over traditional diesel engines. Operating conditionsare electronically monitored to provide precise engine controland optimized engine performance. Precise engine control isachieved by the fuel system’s independent, flexible control offuel injection timing, pressure and duration at every speed andload point. The improved engine performance contributes tobetter fuel economy, faster response, and lower emissionsfor a cleaner, quieter environment and lower cost per ton.

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Engine

3408E

Improvements

The basic principle behind HEUI is that fuel injection iselectronically controlled and physically carried out by high-pressure oil.

HEUI system has two fluid circuits: fuel and oil. Fuel is suppliedfrom the fuel tank through internal passages in the cylinder headto the injectors via a transfer pump. This design eliminates allexternal high-pressure fuel lines. A fuel regulating valve controlsfuel system pressure.

Engine oil is drawn from the engine sump through an oil coolerand filter to both the engine and the gear-driven oil supply pump.The oil supply pump increases system pressure to the actuationlevel of 700 to 3,300 psi. The high-pressure oil travels throughlines into an oil manifold near the injectors. The manifold storesthe oil at actuation pressure ready for the injector operation. Therail pressure control valve electronically controls the outputpressure of the high-pressure oil pump and thereby controls thefuel injection pressure.

The ECM receives input from various engine sensors to determinethe optimum fuel quantity, timing and injection pressure. TheECM then communicates with the with the rail pressure controlvalve to control injection pressure and with the electronic unitinjectors to control fuel quantity and injection timing.

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HEUI Fuel System

Hydraulic pump

Manifold

Fuel injector

Timing gear housingwith speed sensor

Improvements

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• Piston: Aluminum alloy single piece castings with a cast-inoil gallery to cool the piston ring belt area.

• Engine oil transfer pump: Larger capacity for a greatervolume of oil at a lower speed resulting greater reliability andlower sound levels.

• Turbochargers: New bearing system and improvedaerodynamics for better response, altitude compensationand lower emissions.

• Cylinder block: Higher coolant passages, increased wallthickness and deep-skirted lower structure for durability,strength and rigidity.

• Cylinder liner o-rings: New material with a friction resistantcoating for better resistance to deterioration from coolantand oil.

• Cylinder head: Additional coolant passages for better coolantflow to the cylinder. Improved seal in the head to block joint.

• Intake and exhaust valves: Chrome plated stems for smoother,harder surface extends valve life.

Basic Engine Improvements

Piston

Oil transfer pump

Cylinder block

Cylinder liner with o-rings

Intake and exhaust valves

Improvements

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The 3408E engine meets and exceeds the 1996 emissionsregulations and are capable of meeting 2001 regulations. It ismore responsive and produces less smoke and fewer particulatethan the current 3408C engine. Cold start-up mode allows theengine to warm-up faster with less white smoke. Engineoperating noise is reduced by fuel injection rate shaping, fewermoving parts than mechanically actuated fuel systems and bya high capacity, low speed engine oil pump.

Fuel system reliability is improved by the simplicity of designand the requirement for fewer adjustments. Overall reliabilityfor the fuel system is 50% better than the current product.Durability, which measures the engine operating time priorto a major overhaul, has been increased 20% from the current3408C engine.

Performance improvement results from increased flywheelhorsepower and improved torque. The 3408E delivers 430flywheel horsepower and a 34% torque rise. Fuel economy isequal to or better than current engines. BSFC is improved up to5% depending on application. Optimum engine performance isachieved with independent, flexible control of fuel injectiontiming, pressure and duration over the entire engine speed range.

Emissions

Reliability

Performance:

Improvements

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Serviceability is improved with ADEM ECM (ElectronicControl Module). This control system provides features tomonitor critical engine operating conditions, to precisely controlfuel injection pressure, timing and duration, to integrate otherelectronic controls on machine applications and to quicklytroubleshoot faults. Engine speed governing is fully electronicand adjustment free. Engine protection is provided through visualwarning for low oil pressure, high coolant temperature, loss ofcoolant flow and engine overspeed. Troubleshooting is facilitatedby active electronic fault indication and electronic fault loghistory. Engine control data link provides integrated transmissioncontrol and a customer interface for data communications.

This new HEUI fuel system is the only diesel fuel injectionsystem in the world which is virtually adjustment free. It doesnot require rack adjustments or timing height settings commonto mechanically actuate unit injectors. Injector installationrequires only removal and installation of the injector and oiljumper tube, and reconnection of the solenoid wire.

Serviceability

ECM

Improvements

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Axle shaft brakes, similar to those on the 990 wheel loader, willreplace the current oil disc brakes found on the 988F. The newaxle shaft brakes are fully hydraulic, sealed from contaminantsand never need adjustment. Cooling oil contained in the axlehousing is carried by grooves in the face of the disc. This providescooling even when the brake is applied.

The previous design was configured with the brake on the hightorque side of the final drive. The new brakes are located on theaxle shaft before the final drive, giving the name Axle ShaftBrakes. Since the brake is on the low torque side of the finaldrive, the brake itself does not need to generate as much torqueas a conventional brake. With lower torque requirements, thebraking area required is reduced. Thus the new brake is notas large as the previous brake design but has equal or higherbraking capacity.

Even though the brake is smaller, its braking capacity is higherthan conventional brakes. A brake’s capacity is determined byits ability to dissipate heat. The location of the Axle Shaft Brakeprovides a physically larger reservoir of cooling oil. In addition,the separator plates between the friction discs are thicker thanon conventional brake designs adding more heat sink foreffective heat dissipation. With its excellent ability to dissipateheat, this brake, even though carrying less area, is able to providelong, reliable fade-resistant braking.

On conventional brake designs, it is necessary to break the finaldrive to service the brake. With the axle shaft brake, the finaldrive and hub are removed intact. This exposes the brake discs,allowing easy replacement. When the new discs are in, simplyreplace the hub and final drive assembly.

Service Brakes/Axles

Improvements

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The 988F Series II improves the operator’s station by reducingthe sound level, increasing the viewing area and improving theinterior environment. Operator station noise level is reduce to 79dB(A) from 85 dB(A), reducing operator fatigue. Viewing areais increased by adding more glass area to the lower part of thecab. The interior cab environment is modernized witha gray interior color scheme. Other operator orientedenhancements include:

• Ether Aid Automatic actuation controlled by operator’schoice of ADEM or Manual Actuation.

• Throttle Lock Presets the engine speed to enhance operatorcontrol of the machine for high production.The rocker switch located right below theCMS panel turns the system on and off. Thetwo buttons right in front of the right arm restsets and resumes the engine speed. The firstbutton is to set and reduce the rpm. The throttlelock can be shut off by pressing the brakepedal. Previous engine speed may be resumedby the resume button and this button alsoadjusts speed upward in 50 rpm increments.

• Axle Temp Sensor Detects and advises the operator of excessive

axle oil temperature.• CMS Software changes to improve diagnostic

capability.

Operator Station

Improvements

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• Electrical System MPC (Multi Process Controller) 10 is

retained but the software changes were madefor improved flexibility of the machine.• Wiring harnesses changes to improve the

reliability and durability• New & additional circuits• ISO Standard wiring

Steering System Steering hydraulic system redesigned toimprove efficiency and reduce powerrequirement, improving fuel efficiency.

Changed PMS (Payload Measuring System) to PCS II.(Payload Control System). This system gives the operator theability to measure payload on-the-go with an accuracy of +-2%.PCS II compared to PMS has improved reliability, durability,and functionality including download capability. (Available2nd Qtr 1996)

Controlled by ADEM, the ride control system can be engagedat certain speeds automatically or manually similar to the990 system. The ride control option reduces pitching andloping when machine is traveling at higher speeds. Thisreduces spillage and allows the operator to cycle faster forhigher production giving the operator better control of themachine at higher speeds. By minimizing ground inducedshocks, maintenance cost associated with drivetrain and tirescan be reduced.

Standard Bucket: A new, 8.25 cubic yard spade nose rockbucket will replace the current 7.8 cubic yard spade nose rockbucket to take advantage of the machine’s higher horsepowerand higher productivity.

Attachments• Payload Monitor

• Ride Control

• Buckets

Improvements

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Quarry Bucket: The standard rock bucket, when used inmaterial weighing less than 2,700 lbs/lcy, may not obtain ratedpayloads. The 9.0 cubic yard quarry bucket allows the 988FSeries II loader to achieve its full capacity and is recommendedfor well shot quarry materials weighing less than 2,700 lbs/lcy.

Heavy Duty Quarry Bucket: This 7.8 cubic yard spade noserock bucket is specifically designed for quarry, aggregatesand mining operations, and factory modified with additionalprotection. This bucket delivers maximum strength, durabilityand wear life in high impact/high abrasion conditions.

Major improvements are as follows:

• New 3408E HEUI engine with increased horsepower• Improved Productivity . . . . . . . . . . . .Increased performance• Improved Availability . . . . . . . . . . . . . .Increased reliability• Improved Operating Costs . . . . . . .Increased durability and

serviceability• New high capacity axle shaft brakes.

• Improved Availability . . . . . . . . . . . . . .Increased reliability• Improved Operating Costs . . . . . . .Increased durability and

serviceability• New Cab

• Improved Productivity . . . . . . . .Increased viewing area andreduced noise

Summary

Caterpillar Large Wheel Loaders listened to customers aroundthe world and improved a machine which already had anexcellent reputation for reliability, durability and productivity.The new 988F Series II machine was tested and found to bemore fuel efficient and productive than its predecessor.Reliability and durability were also improved, further reducingthe customers’ cost per ton.

Additional information available on Large Wheel Loaders,3408E engine and HEUI fuel system.

• Product News• HEUI Fuel system brochure• HEUI Fuel system video• Block Handling Specalog• Logger Specalog• Load & Carry Specalog• 988F Series II Specalog• 988F Series II / 990 Series II walk-around video• Saleskit• Job study• Heavy Duty Quarry Bucket and GET Options• Quarry Bucket Salesgram

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TEKQ4022December 1995

© 1995 CaterpillarPrinted in U.S.A.

The information contained herein is intended for circulation only to Caterpillar and dealer employees whose duties require knowledge of such reports and isintended exclusively for their information and training. It may contain unverified analysis and facts observed by various Caterpillar or dealer employees. However,effort has been made to provide reliable results regarding any information comparing Caterpillar built and competitive machines. Effort has been made to use thelatest available spec sheet and other material in the full understanding that these are subject to change without notice. Any reproduction of this release without the foregoing explanation is prohibited.