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Caterpillar Product Information

Salesgram

For Dealer Sales Personnel

December 1997

Caterpillar

988FSeries IIWheel LoaderEnhancements

Caterpillar announces enhancements to the 988F Series II Wheel

Loader which increase performance and durability, helping lower

the cost per ton, and building upon a reputation for reliability,

serviceability, and comfort. Tests results have shown better cycle

times, more productivity, less fuel consumption, while at the same

time increasing power in demanding conditions.

The already-proven strengths of the 988F Series II, including rugged

durability and needed power for tough large loader applications,

are further enhanced as a result of the many improvements outlined

here. The March, 1997, changes begin with serial number 2ZR700.

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March 97 Enhancements

Engine Lug Curve

One of the most notable changes in the 988F Series II is increased

power during demanding engine lugging conditions, to maintain

hydraulic speed and rimpull. In double stall conditions, such as tough

digging in hard rock or during bucket lift while climbing a ramp,power increases from 430 hp (321 kW) in the previous 988F II to

470 hp (350 kW) today. The extra torque helps lower cycle times

by maintaining speed and power when theyre needed most.

The pump now has 10 tooth gears instead of 8 to improve flow

and pressure characteristics. Also, the pumps design is more

efficient, more durable and quieter.

In order to save power, the pilot and brake pump size is reduced

for an average savings of 7.5 hp (5.5 kW). Less parasitic lossresults in more power for doing work. Overall, that means

improved performance and better fuel economy.

2

Performance

Steering Pump

Pilot & Brake Pump

1200 1400 1600 1800 2000

320

340

360

380

400

420

440

460

480

239

254

269

283

298

313

328

343

358

988F Series IIEngine Power

Engine RPM

Before 3-97 Enhancements

HP

kW

After 3-97 Enhancements

1200 1400 1600 1800 2000 2200

0

200

400

600

800

1000

1200

1400

1600

1800

2000

0

270

540

815

1085

1355

1630

1900

2170

2440

2710

988F Series IINet Torque

Engine RPM

Before 3-97 Enhancements

FT-LB

NM

After 3-97 Enhancements

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Axle Housing & Differential Carrier Casting

There is now added strength around the differential to axle joint,

with nine additional bolts on the differential carrier. Bolts in

critical stress areas are updated to Grade 9.

Differential & Final Drive Bearings

Bearings are upgraded, having a better finish for longer life in the

differential and in the outboard final drive.

Bevel Pinion Gear

Shot peened bevel pinion gears provide for longer gear life by stress

relieving the gears and by improving the finish of contact surfaces.

Lift ArmWeld

There is now an improved welding process used on the lift cylinder

bosses. The process smoothes the weld to reduce stress and

improve the boss connection.

Frame Enhancements

The frames have been modified to improve fatigue life under the

load of increased power. The axle pad radius was increased by

adding more material (non-engine end frame). Also, the rear crossmember to side plate weld joint (engine end frame) has been

improved to reduce weld stresses.

3

Reliability/Durability

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Torque Converter Centrifugal Valve

The centrifugal valve has been changed in the torque converter

to maintain and recover engine RPM in heavy lugging conditions.

This change was in production with serial number 2ZR00487

in September of 1996. The part number is 9U-9377.

Quad Check Valve with Smaller Orifices in Steering Valve

Steering jerk and operator fatigue are reduced as a smaller orificein the steering control valve controls flow rates better. This was in

production with serial number 2ZR00563 in November of 1996.

Differential Material/Finishing Upgrade

Material was upgraded in the differential spherical thrust washer

to eliminate cracking due to flexing. Also, the differential spiders,

pinions, and related parts were improved with a smoother, longer

lasting finish. These changes were in production with serial

number 2ZR00509 in October of 1996.


Pre-March 97 Enhancements

Axle Oil Cooler Attachment

An axle oil cooler attachment, which is recommended for any high

braking application, circulates axle oil through an oil to air cooler

core. This results in a 55 to 70 degree C (99 to 126 F) temperature

reduction. It also filters axle oil. The benefit is improved brake andbearing life. The factory attachment part number is 145-2300, and

the retrofit kit part number is 2Q-7762.

4

Attachment

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Performance Comparison

5

A performance study was conducted to compare the actual

productivity of 988F Series II wheel loaders equipped with and

without these enhancements. Both truck loading and load and carry

applications were studied. The summary results below indicate

marked improvement in productivity and fuel consumption

with the 988F Series II enhancements.

988F Series II Truck Loading in Rock

3/97

Cycle Time (minutes) Pre-3/97 Enhancements Advantage

Travel Loaded 0.124 0.129

Dump 0.079 0.071

Travel Empty 0.105 0.102

Load 0.124 0.114

Total 0.432 0.416Baseline 100% 96% 4% for 3/97

Enhancements

Production

Cycles/60 Min. Hr. 138.89 144.23

Total Tons (study period) 822.40 824.80

Average Bucket Payload (tons) 12.46 12.50

Average Truck Load (tons) 37.38 37.49

Tons/60 Min. Hr. 1731 1803

Tons/50 Min. Hr. 1436 1496

Baseline 100% 104% 4% for 3/97Enhancements

Fuel


Fuel Used (study period) 15.13 15.07

Tons/Gallon 54 55

Baseline 100% 101% 1% for 3/97

Enhancements

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988F Series II Load & Carry

3/97

Cycle Time (minutes) Pre-3/97 Enhancements Advantage

Travel Loaded 0.831 0.792

Dump 0.072 0.062

Travel Empty 0.634 0.635

Load 0.105 0.084

Total 1.642 1.573

Baseline 100% 96% 4% for 3/97

Enhancements

Production

Cycles/60 Min. Hr. 36.54 38.14

Average Bucket Payload (tons) 10.88 10.75

Tons/60 Min. Hr. 398 410

Tons/50 Min. Hr. 330 340

Baseline 100% 103% 3% for 3/97

Enhancements

Fuel


Fuel Used (study period) 8.47 8.00

Tons/Gallon 20.5 21.5

Baseline 100% 105% 5% for 3/97

Enhancements

Performance Comparison

6

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Summary

7

The 988F Series II with enhancements is even better. With recent

changes and ones in production March 1997 (serial number 2ZR700

and up), the 988F Series II improves on its own impressive record

for performance, reliability, serviceability, and comfort. The changes

provide extra power when needed, in critical lugging conditions,and lower fuel consumption. Increased productivity, plus the many

durability and reliability enhancements detailed in this Salesgram,

help the 988F Series II lower cost per ton yet again.

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TEKQ3759-01December 1997

www.CAT.com

1997 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 is

intended 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 the

latest avai lable spec sheet and other mat erial in the f ul l understanding that these are subject t o change w ithout notice. Any reproduction of this release withoutthe f oregoing explanation is prohibi ted.

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