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    988 Wheel Loader
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    Engine
    Engine Power - ISO 14396:2002 580 hp - 449 hp -
    Engine Model Cat® C18 Cat C3.6 Cat® C15 Cat C3.6
    Rated Speed 1700/rpm - 2000 -
    Peak Power Speed 1500/rpm - 1600 -
    Gross Power - SAE J1995:2014 588 hp - 456 hp -
    Net Power - SAE J1349:2011 538 hp - 373 hp -
    Bore 5.7 in 3.85 in 5.4 in 3.85 in
    Stroke 7.2 in 4.72 in 6.75 in 4.72 in
    Displacement 1105 in³ 220 in³ 927 in² 220 in³
    Peak Torque - 1,200 rpm 2104 lbf·ft - - -
    Torque Rise 58 % - 16% -
    Note (1) Three engine emission options are available: 1. Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards. 2. Meets Brazil MAR-1 emission standards, equivalent to U.S. EPA Tier 3 and EU Stage IIIA. 3. Meets China Nonroad Stage IV emissio - Two engine emission options are available: 1. Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan 2014 emission standards. 2. Meets Brazil MAR-1 emission standards, equivalent to U.S. EPA Tier 3 and EU Stage IIIA. -
    Note (2) Net power advertised is the power available at the flywheel when the engine is equipped with fan at minimum speed, air intake system, exhaust system, and alternator. - Net power advertised is the power available at the flywheel when the engine is equipped with fan at minimum speed, air intake system, exhaust system, and alternator. -
    Maximum Gross Power - 110 hp - 110 hp
    Rated Net Power - Rated Engine Speed - 2200 r/min - 2200 r/min
    Maximum Gross Power - Rated Engine Speed - 1800 r/min - 1800 r/min
    Rated Net Power - SAE J1349 - 99 hp - 99 hp
    Maximum Gross Power - ISO 14396 (metric) - 112 hp - 112 hp
    Rated Net Power - ISO 9249 - 98 hp - 98 hp
    Maximum Gross Torque - SAE J1995 - 335 ft·lbf - 335 ft·lbf
    Maximum Gross Torque - ISO 14396 - 332 ft·lbf - 332 ft·lbf
    Maximum Net Torque - SAE J1349 - 329 ft·lbf - 329 ft·lbf
    Maximum Net Torque - ISO 9249 - 327 ft·lbf - 327 ft·lbf
    Emissions - Engine meets Tier 4 Final/Stage V emission standards. - Engine meets Tier 4 Final/Stage V emission standards.
    Note - Net power advertised is the power available at the flywheel plus front drive implement pump when the engine is equipped with fan, air cleaner, muffler and alternator. - Net power advertised is the power available at the flywheel plus front drive implement pump when the engine is equipped with fan, air cleaner, muffler and alternator.
    Maximum Gross Power - ISO 14396 - 110 hp - 110 hp
    Rated Speed - 2,000 rpm - EEC 80/1269 - - 373 hp -
    Rated Speed - 2,000 rpm - ISO 9249 - - 373 hp -
    Peak Torque (1,200 rpm) - SAE J1995:2014 - - 1778 lb/ft -

    Operating Specifications
    Operating Weight 112574 lb - - -
    Bucket Capacity Range 4.7-13 m3 (6.2-17 yd3) - 5.0-10.3 m³ (6.5-13.5 yd³) -
    Rated Payload - Quarry Face 12.5 t - - -
    Rated Payload - Loose Material 16 t - - -
    Cat Truck Match - Standard 770 - 772 - 770/735/740/745 -
    Cat Truck Match - High Lift 773 - 775 - 772/773 -
    Operating Weight - Standard - - 97785 lb -
    Operating Weight - High Lift - - 104005 lb -
    Rated Payload - Standard (Quarry Face) - - 11 ton (US) -
    Rated Payload - Loose Material (Standard) - - 14 ton (US) -
    Rated Payload - High Lift (Quarry Face) - - 11 ton (US) -
    Rated Payload - Loose Material (High Lift) - - 12.1 ton (US) -

    Transmission
    Transmission Type Cat planetary powershift - Cat planetary power shift -
    Forward - 1 4 mile/h - 5 mile/h -
    Forward - 2 7.2 mile/h - 8 mile/h -
    Forward - 3 12.7 mile/h - - -
    Forward - 4 21.6 mile/h - - -
    Reverse - 1 4.7 mile/h - 5 mile/h -
    Reverse - 2 8.3 mile/h - 8 mile/h -
    Reverse - 3 14.4 mile/h - - -
    Direct Drive - Forward 1 Lock-up disabled - - -
    Direct Drive - Forward 2 7.8 mile/h - 8 mile/h -
    Direct Drive - Forward 3 13.9 mile/h - 14 mile/h -
    Direct Drive - Forward 4 24.4 mile/h - 24 mile/h -
    Direct Drive - Reverse 1 5 mile/h - - -
    Direct Drive - Reverse 2 8.9 mile/h - 9 mile/h -
    Direct Drive - Reverse 3 15.8 mile/h - 16 mile/h -
    Note - *Creeper Control allows speed control from a stand still up to 10 km/h (6.3 mph). The Creeper Control will only work in Range 1. - *Creeper Control allows speed control from a stand still up to 10 km/h (6.3 mph). The Creeper Control will only work in Range 1.
    Forward and Reverse - Speed Range 3 - 25 mile/h - 25 mile/h
    Forward and Reverse - Speed Range 2* - 12.5 mile/h - 12.5 mile/h
    Forward and Reverse - Speed Range 1* - 6.3 mile/h - 6.3 mile/h
    Direct Drive - Reverse 4 - - 25.4 mile/h -

    Hydraulic System - Lift/Tilt
    Lift/Tilt System - Circuit EH- Positive Flow Control, Flow Sharing - Load Sense -
    Lift/Tilt System - Pump Variable displacement piston - 2 × 110 cc variable displacement -
    Maximum Flow at 1,400-1,860 rpm 153 gpm - - -
    Relief Valve Setting - Lift/Tilt 4757 psi - 4050 psi -
    Cylinders, Double Acting - Lift, Bore and Stroke 210 mm × 1050 mm (8.7 in × 41.3 in) - - -
    Cylinders, Double Acting - Tilt, Bore and Stroke 266 mm × 685 mm (8.7 in × 27 in) - - -
    Pilot System Variable displacement piston - - -
    Relief Valve Setting - Main 551 psi - - -
    Maximum Flow at 2,165 rpm - - 123 gpm -
    Lift Cylinder - Bore - - 7.5 in -
    Lift Cylinder - Stroke - - 45 in -
    Tilt Cylinder - Bore - - 6.7 in -
    Tilt Cylinder - Stroke - - 28.4 in -

    Hydraulic Cycle Time (1,400-1,860 rpm)
    Rack Back 4.5 s - - -
    Raise 8 s - - -
    Dump 2.2 s - - -
    Lower Float Down 3.5 s - - -
    Total Hydraulic Cycle Time - Empty Bucket 18.2 s - - -

    Hydraulic System - Steering
    Steering System - Circuit Pilot, load sensing - Load Sense -
    Steering System - Pump Piston, variable displacement - Piston, variable displacement -
    Maximum Flow at 1,400-1,600 rpm 71.3 gpm - - -
    Relief Valve Setting - Steering 4351 psi - - -
    Total Steering Angle 86 ° - 70° -
    Steering Cycle Times - High Idle 3.4 s - - -
    Steering Cycle Times - Low Idle 5.6 s - - -
    Maximum Flow at 1,400 rpm - - 52 gpm -
    Steering Cut Off Pressure - - 4000 psi -

    Air Conditioning System
    Air Conditioning • The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf. See the label or instruction manual for identification of the gas. • If equipped with R134a (Global Warming Potential = 1430), the system - The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf. See the label or instruction manual for identification of the gas. - If equipped with R134a (Global Warming Potential = 1430), the system co -

    Axles
    Front Fixed Fixed; Locking differential (standard) Fixed Fixed; Locking differential (standard)
    Rear Trunnion Oscillating ±11 degrees; Locking differential (Standard) Trunnion Oscillating ±11 degrees; Locking differential (Standard)
    Oscillation Angle 13 ° - ±12.5° -
    Oscillation Angle - Chain Arrangement - - ±8.5° -

    Brakes
    Brakes ISO 3450:2011 - ISO 3450:2011 -

    Operator's Cab
    ROPS/FOPS ROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards - ROPS/FOPS meet ISO 3471:2008 (ROPS) and ISO 3449:2005 Level II (FOPS) -

    Sound Performance - Tier 4 Final / Stage V
    Operator Sound Pressure Level (ISO 6396:2008) 73 dB(A) - 73 dB(A) -
    Machine Sound Power Level (ISO 6395:2008) 111 dB(A) - 113 dB(A) -
    Operator Sound Pressure Level (ISO 6396:2008)* 72 dB(A) - 72 dB(A) -
    Machine Sound Power Level (ISO 6395:2008)** 109 dB(A) - 110 dB(A) -
    Note (1) * For machines in European Union countries and in countries that adopt the “EU Directives” and “UK Directives.” - * For machines in European Union countries and in countries that adopt the “EU Directives” and “UK Directives.” -
    Note (2) ** European Union Directive “2000/14/EC” as amended by “2005/88/EC” and UK Noise Regulation 2001 No. 1701. - ** European Union Directive “2000/14/EC” as amended by “2005/88/EC” and UK Noise Regulation 2001 No. 1701. -
    Note (3) The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. - The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. -
    Note (4) The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. - The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. -
    Note (5) Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment. - Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment. -

    Sound Performance - Tier 3 / Stage IIIA
    Operator Sound Pressure Level (ISO 6396:2008) 73 dB(A) - 74 dB(A) -
    Machine Sound Power Level (ISO 6395:2008) 112 dB(A) - 113 dB(A) -
    Operator Sound Pressure Level (ISO 6396:2008)* 72 dB(A) - 73 dB(A) -
    Machine Sound Power Level (ISO 6395:2008)** 110 dB(A) - 110 dB(A) -
    Note (1) * For machines in European Union countries and in countries that adopt the “EU Directives” and “UK Directives.” - * For machines in European Union countries and in countries that adopt the “EU Directives” and “UK Directives.” -
    Note (2) ** European Union Directive “2000/14/EC” as amended by “2005/88/EC” and UK Noise Regulation 2001 No. 1701. - ** European Union Directive “2000/14/EC” as amended by “2005/88/EC” and UK Noise Regulation 2001 No. 1701. -
    Note (3) The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. - The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. -
    Note (4) The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. - The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70% of the maximum engine cooling fan speed. -
    Note (5) Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment. - Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment. -

    Service Refill Capacities
    Fuel Tank 188 gal (US) 43.6 gal (US) 141 gal (US) 43.6 gal (US)
    Cooling System 31.7 gal (US) 5.7 gal (US) - 5.7 gal (US)
    Coolant (Validated by Test Cell Fill Quantities) 33 gal (US) - - -
    Crankcase 15.9 gal (US) - 9 gal (US) -
    Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage V Only) 8.7 gal (US) - - -
    Transmission 24.3 gal (US) 0.8 gal (US) 20 gal (US) 0.8 gal (US)
    Transmission - Validated by Test Cell Fill Quantities 29 gal (US) - - -
    Differential - Final Drives - Front 49.1 gal (US) - - -
    Differential - Final Drives - Rear 49.1 gal (US) - - -
    Hydraulic System Factory Fill 125.5 gal (US) - 87 gal (US) -
    Hydraulic System - Tank Only 63.4 gal (US) - 34 gal (US) -
    Note • All non-road Tier 4 Final/Stage V diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) or ULSD blended with the following lower-carbon intensity fuels** up to: – 20% biodiesel FAME (fatty acid methyl ester DEF used in Cat SCR systems must meet the requirements outlined in the International Organization for Standardization (ISO) standard 22241-1. - DEF used in Cat SCR systems must meet the requirements outlined in the International Organization for Standardization (ISO) standard 22241-1.
    Diesel Exhaust Fluid (DEF) Tank - 4.8 gal (US) - 4.8 gal (US)
    Hydraulic System - Including Tank - 25.9 gal (US) - 25.9 gal (US)
    Engine Crankcase - 2.6 gal (US) - 2.6 gal (US)
    Hydraulic Tank - 14.5 gal (US) - 14.5 gal (US)
    Axles - Front Center Differential - 2 gal (US) - 2 gal (US)
    Axles - Rear Center Differential - 2 gal (US) - 2 gal (US)
    Fuel Tank - Short Lift - - 127 gal (US) -
    Cooling Systems - - 26 gal (US) -
    Diesel Exhaust Fluid Tank - - 6 gal (US) -
    Axle Oil - Differentials and Final Drives - Front - - 49 gal (US) -
    Axle Oil - Differentials and Final Drives - Rear - - 45 gal (US) -

    Dimensions (Approximate) - Standard Lift Linkage
    Ground to Top of ROPS 13.8 ft - 13.5 ft -
    Ground to Top of Exhaust Stacks 14.8 ft - 13.3 ft -
    Ground to Top of Hood 10.9 ft - 10.7 ft -
    Rear Axle - Centerline to Bumper 10.5 ft - 10.3 ft -
    Front Axle Centerline to Bucket Tip 14 ft - 13.8 ft -
    Wheel Base 14.9 ft - 12.5 ft -
    Maximum Overall Length 39.3 ft - 36.6 ft -
    Ground to Lower Hitch Clearance 1.9 ft - 1.5 ft -
    Clearance at Maximum Lift 11.9 ft - 10.1 ft -
    B-Pin Height - Maximum Lift 18 ft - 16.1 ft -
    Maximum Overall Height - Bucket Raised 24.5 ft - 22.4 ft -
    Reach - Maximum Lift 6.5 ft - 7.1 ft -
    Ground to Center of Front Axle - - 3.2 ft -
    Ground to Fuel Tank Clearance - - 2.3 ft -
    Note - -
    • All dimensions are approximate.
    • Specifications are calculated with a 6.1 m³ (8.0 yd³) rock bucket.
    		 -

    Dimensions (Approximate) - High Lift Linkage
    Ground to Top of ROPS 13.8 ft - 13.5 ft -
    Ground to Top of Exhaust Stacks 14.8 ft - 13.3 ft -
    Ground to Top of Hood 10.9 ft - 10.7 ft -
    Rear Axle - Centerline to Bumper 10.5 ft - 10.3 ft -
    Front Axle Centerline to Bucket Tip 15.3 ft - 15.3 ft -
    Wheel Base 14.9 ft - 12.5 ft -
    Maximum Overall Length 40.7 ft - 38 ft -
    Ground to Lower Hitch Clearance 1.9 ft - 1.5 ft -
    Clearance at Maximum Lift 13.3 ft - 11.6 ft -
    B-Pin Height - Maximum Lift 19.3 ft - 17.6 ft -
    Maximum Overall Height - Bucket Raised 25.8 ft - 23.9 ft -
    Reach - Maximum Lift 6.8 ft - 7.4 ft -
    Ground to Center of Front Axle - - 3.2 ft -
    Ground to Fuel Tank Clearance - - 2.3 ft -
    Note - -
    • All dimensions are approximate.
    • Specifications are calculated with a 6.1 m³ (8.0 yd³) rock bucket.
    		 -

    Weights
    Operating Weight - 18102 lb - 19103 lb

    Buckets
    Bucket Capacities - 1.3-3.5 m3 (1.7-4.6 yd3) - 1.3-3.5 m3 (1.7-4.6 yd3)
    Bucket Capacities - General Purpose - 1.3-1.9 m³ (1.7-2.5 yd³) - 1.3-1.9 m³ (1.7-2.5 yd³)
    Bucket Capacities - Light Material - 2.5-3.5 m³ (3.3-4.6 yd³) - 2.5-3.5 m³ (3.3-4.6 yd³)

    Sustainability
    Recyclability - 95% - 95%

    Cab
    ROPS - ISO 3471:2008 - ISO 3471:2008
    FOPS - ISO 3449:2005 - ISO 3449:2005
    Note (2) - The declared dynamic operator sound pressure levels per ISO 6396:2008*, when the cab is properly installed and maintained, is 77 dB(A). - The declared dynamic operator sound pressure levels per ISO 6396:2008*, when the cab is properly installed and maintained, is 77 dB(A).
    Note (3) - The labelled sound power level for the CE marked configurations when measured according to the test procedure and conditions specified in 2000/14/EC (as amended by 2005/88/EC) is 103 dB(A). - The labelled sound power level for the CE marked configurations when measured according to the test procedure and conditions specified in 2000/14/EC (as amended by 2005/88/EC) is 103 dB(A).
    Note (1) - Cab and Rollover Protective Structures (ROPS) are standard in North America and Europe. - Cab and Rollover Protective Structures (ROPS) are standard in North America and Europe.
    Note (4) - *The measurements were conducted with the cab doors and windows closed. - *The measurements were conducted with the cab doors and windows closed.

    Steering
    Maximum Working Pressure - Steering Pump - 2683 psi - 3263 psi
    Steering Articulation Angle - Each Direction - 40 ° - 40 °
    Steering Cycle Times - Full Left to Full Right - At 2,350 rpm: 90 rpm Steering Wheel Speed - 3.2 s - 2.8 s
    Maximum Flow - Steering Pump - 17 gpm - 22 gpm
    Number of Steering Wheel Turns - Full Left to Full Right or Full Right to Full Left - 3.75 turns - 3.75 turns

    Loader Hydraulic System
    Hydraulic Cycle Time - Dump, at Maximum Reach - 1.4 s - 1.4 s
    Hydraulic Cycle Time - Total Cycle Time - 12.5 s - 12.5 s
    Maximum Working Pressure - Implement Pump - 3408 psi - 4061 psi
    Relief Pressure - Tilt Cylinder - 4931 psi - 4931 psi
    Hydraulic Cycle Time - Rackback - 2.2 s - 2.2 s
    Relief Pressure - Tilt Cylinder - 3rd Function Maximum Working Pressure - 3046 psi - 3046 psi
    Hydraulic Cycle Time - Raise, Ground Level to Maximum Lift - 5.2 s - 5.2 s
    Relief Pressure - Tilt Cylinder - 4th Function Maximum Working Pressure - 3046 psi - 3046 psi
    Maximum Flow - Implement Pump - 4th Function, Maximum Flow - 24 gpm - 24 gpm
    Maximum Flow - Implement Pump - 3rd Function, Maximum Flow - 24 gpm - -
    Hydraulic Cycle Time - Float Down, Maximum Lift to Ground Level - 3.7 s - 3.7 s
    Maximum Flow - Implement Pump - 32 gpm - 39 gpm
    Maximum Flow - Implement Pump - 3rd Function, Maximum Flow, Standard - - - 24 gpm
    Maximum Flow - Implement Pump - 3rd Function, Maximum Flow, High - - - 32 gpm

    Tires
    Note (2) - In certain applications, the loader’s productive capabilities may exceed the tire’s tonnes-km/h (ton-mph) capabilities. - In certain applications, the loader’s productive capabilities may exceed the tire’s tonnes-km/h (ton-mph) capabilities.
    Standard Size - 15.5 R25 L2 XTLA - 17.5 R25 L2 XTLA
    Other Choices Include - 17.5 R25 L2 XTLA; 15.5 R25 L3 XHA2; 17.5 R25 L3 XHA2; 17.5-25 L2/L3 SGL; 17.5-25 L3 HRL D/L-3A; 17.5 R25 L2 Snow - 17.5 R25 L3 XHA2; 17.5-25 L2/L3 SGL; 17.5-25 L3 HRL D/L-3A; 17.5 R25 L2 Snow; 17.5 R25 Solid
    Note (3) - Caterpillar recommends that you consult a tire supplier to evaluate all conditions before selecting a tire model. - Caterpillar recommends that you consult a tire supplier to evaluate all conditions before selecting a tire model.
    Note (1) - Other tire choices are available. Contact your Cat dealer for details. - Other tire choices are available. Contact your Cat dealer for details.

    Hydraulic Cycle Times
    Rack Back - - 4.5 s -
    Raise - - 9 s -
    Dump - - 3.5 s -
    Lower - - 5.2 s -
    Lower Float Down - - 4.3 s -
    Total Hydraulic Cycle Time - - 21.3 s -

    Dimensions (Approximate) - Quick Coupler and 6.1 m³ (8.0 yd³) Bucket
    Ground to Top of ROPS - - 13.5 ft -
    Ground to Top of Exhaust Stacks - - 13.3 ft -
    Ground to Top of Hood - - 10.7 ft -
    Ground to Center of Rear Axle - - 3.2 ft -
    Ground to Fuel Tank Clearance - - 2.3 ft -
    Ground to Lower Hitch Clearance - - 1.5 ft -
    Reach at Maximum Lift - - 8 ft -
    Clearance at Maximum Lift - - 10.7 ft -
    B-Pin Height at Maximum Lift - - 15 ft -
    Maximum Overall Height, Bucket Raised - - 20.9 ft -
    Rear Axle Center Line to Bumper - - 10.3 ft -
    Wheel Base - - 12.5 ft -
    Maximum Overall Length - - 35 ft -
    Front Axle Centerline to Bucket Tip - - 12.2 ft -

    Dimensions (Approximate) - Quick Coupler and Fork
    Ground to Top of ROPS - - 13.5 ft -
    Ground to Top of Exhaust Stacks - - 13.3 ft -
    Ground to Top of Hood - - 10.7 ft -
    Ground to Center of Rear Axle - - 3.2 ft -
    Ground to Fuel Tank Clearance - - 2.3 ft -
    Ground to Lower Hitch Clearance - - 1.5 ft -
    B-Pin Height at Maximum Lift - - 15 ft -
    Rear Axle Center Line to Bumper - - 10.3 ft -
    Wheel Base - - 12.5 ft -
    Maximum Overall Length - - 35.4 ft -
    Front Axle Centerline to Bucket Tip - - 12.6 ft -
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