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    988 GC Wheel Loader
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    Operating Specifications
    Operating Weight 112426 lb 112574 lb - -
    Bucket Capacity Range 6.4-7.6 m3 (8.3-10 yd3) 4.7-13 m3 (6.2-17 yd3) - -
    Rated Payload - Quarry Face 12.5 ton (US) 12.5 t - -
    Cat Truck Match - High Lift 772/773/775 773 - 775 - -
    Rated Payload - Loose Material - 16 t - -
    Cat Truck Match - Standard - 770 - 772 - -

    Engine
    Engine Model Cat® C15 Cat® C18 Cat C3.6 Cat C3.6
    Rated Speed 2000 rpm 1700/rpm - -
    Peak Power Speed 1600 rpm 1500/rpm - -
    Gross Power - SAE J1995:2014 456 hp 588 hp - -
    Net Power - SAE J1349:2011 448 hp 538 hp - -
    Bore 5.4 in 5.7 in 3.85 in 3.85 in
    Stroke 6.75 in 7.2 in 4.72 in 4.72 in
    Displacement 927 in³ 1105 in³ 220 in³ 220 in³
    Peak Torque (1,200 rpm) - SAE J1995:2014 1778 lbf·ft - - -
    Torque Rise 16% 58 % - -
    Note (1) Two engine emission options are available: 1. Meets U.S. EPA Tier 4 Final, EU Stage V, and Japan emission standards. 2. Meets Brazil MAR-1 emission standards, equivalent to U.S. EPA Tier 3 and EU Stage IIIA. 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 - -
    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. - -
    Note (3) Net power at the flywheel when the fan is at maximum speed is 304 kW / 408 hp per SAE reference conditions. - - -
    Engine Power - ISO 14396:2002 - 580 hp - -
    Peak Torque - 1,200 rpm - 2104 lbf·ft - -
    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

    Transmission
    Transmission Type Cat planetary power shift Cat planetary powershift - -
    Forward - 1 5 mile/h 4 mile/h - -
    Forward - 2 8 mile/h 7.2 mile/h - -
    Reverse - 1 5 mile/h 4.7 mile/h - -
    Reverse - 2 8 mile/h 8.3 mile/h - -
    Direct Drive - Forward 1 Lock-up disabled Lock-up disabled - -
    Direct Drive - Forward 2 8 mile/h 7.8 mile/h - -
    Direct Drive - Forward 3 14 mile/h 13.9 mile/h - -
    Direct Drive - Forward 4 24 mile/h 24.4 mile/h - -
    Direct Drive - Reverse 1 Lock-up disabled 5 mile/h - -
    Direct Drive - Reverse 2 9 mile/h 8.9 mile/h - -
    Direct Drive - Reverse 3 16 mile/h 15.8 mile/h - -
    Direct Drive - Reverse 4 25.4 mile/h - - -
    Note Travel speeds based on 35/65-R33 tires. - *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 - 3 - 12.7 mile/h - -
    Forward - 4 - 21.6 mile/h - -
    Reverse - 3 - 14.4 mile/h - -
    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

    Hydraulic System - Lift/Tilt
    Lift/Tilt System - Circuit EH - Load Sense EH- Positive Flow Control, Flow Sharing - -
    Lift/Tilt System - Pump Variable displacement piston Variable displacement piston - -
    Maximum Flow at 2,165 rpm 159 gpm - - -
    Relief Valve Setting - Lift/Tilt 4598 psi 4757 psi - -
    Cylinders, Double Acting - Lift, Bore and Stroke 190 mm x 1216 mm (7.5 in x 48 in) 210 mm × 1050 mm (8.7 in × 41.3 in) - -
    Cylinders, Double Acting - Tilt, Bore and Stroke 170 mm x 722 mm (6.7 in x 28.4 in) 266 mm × 685 mm (8.7 in × 27 in) - -
    Pilot System Variable displacement piston Variable displacement piston - -
    Relief Valve Setting 500 psi - - -
    Maximum Flow at 1,400-1,860 rpm - 153 gpm - -
    Relief Valve Setting - Main - 551 psi - -

    Hydraulic Cycle Times
    Rack Back 3.8 s - - -
    Raise 7.5 s - - -
    Dump 3 s - - -
    Lower Float Down 4.6 s - - -
    Total Hydraulic Cycle Time - Empty Bucket 18.9 s - - -

    Hydraulic System - Steering
    Steering System - Circuit Pilot, load sensing Pilot, load sensing - -
    Steering System - Pump Piston, variable displacement Piston, variable displacement - -
    Maximum Flow at 2,165 rpm 52 gpm - - -
    Relief Valve Setting - Steering 4000 psi 4351 psi - -
    Total Steering Angle 70° 86 ° - -
    Steering Cycle Times - High Idle 3 s 3.4 s - -
    Steering Cycle Times - Low Idle 5.2 s 5.6 s - -
    Maximum Flow at 1,400-1,600 rpm - 71.3 gpm - -

    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 co • 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 - -

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

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

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

    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) 113 dB(A) 111 dB(A) - -
    Operator Sound Pressure Level (ISO 6396:2008)* 72 dB(A) 72 dB(A) - -
    Machine Sound Power Level (ISO 6395:2008)** 110 dB(A) 109 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) 74 dB(A) 73 dB(A) - -
    Machine Sound Power Level (ISO 6395:2008) 113 dB(A) 112 dB(A) - -
    Operator Sound Pressure Level (ISO 6396:2008)* 73 dB(A) 72 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 141 gal (US) 188 gal (US) 43.6 gal (US) 43.6 gal (US)
    Cooling System 27 gal (US) 31.7 gal (US) 5.7 gal (US) 5.7 gal (US)
    Engine Crankcase 9 gal (US) - 2.6 gal (US) 2.6 gal (US)
    Diesel Exhaust Fluid Tank 5.5 gal (US) - - -
    Transmission 20 gal (US) 24.3 gal (US) 0.8 gal (US) 0.8 gal (US)
    Differential - Final Drives - Front 49 gal (US) 49.1 gal (US) - -
    Differential - Final Drives - Rear 45 gal (US) 49.1 gal (US) - -
    Hydraulic System Factory Fill 94 gal (US) 125.5 gal (US) - -
    Note Cat diesel engines are required to use ULSD (ultra-low sulfur diesel fuel with 15 ppm of sulfur or less) and are compatible* with ULSD blended with the following lower-carbon intensity fuels** up to: - 20% biodiesel FAME (fatty acid methyl ester) *** - 10 • 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.
    Coolant (Validated by Test Cell Fill Quantities) - 33 gal (US) - -
    Crankcase - 15.9 gal (US) - -
    Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage V Only) - 8.7 gal (US) - -
    Transmission - Validated by Test Cell Fill Quantities - 29 gal (US) - -
    Hydraulic System - Tank Only - 63.4 gal (US) - -
    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)
    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)

    Dimensions (Approximate) - High Lift
    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 Fuel Tank Clearance 2.2 ft - - -
    Rear Axle - Centerline to Bumper 10.3 ft - - -
    Front Axle Centerline to Bucket Tip 16.7 ft - - -
    Wheel Base 12.5 ft - - -
    Maximum Overall Length 39.5 ft - - -
    Ground to Lower Hitch Clearance 1.5 ft - - -
    Ground to Center of Front Axle 3.2 ft - - -
    Clearance at Maximum Lift (45° Dump) 12 ft - - -
    B-Pin Height - Maximum Lift 18.7 ft - - -
    Maximum Overall Height - Bucket Raised 25 ft - - -
    Reach at Maximum Lift (45° Dump) 7.7 ft - - -
    Note Specifications are calculated with 6.9 m3 (9.0 yd3 ) rock bucket equipped with Michelin XLDD1 35/65 R33 tires. - - -

    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 - -

    Dimensions (Approximate) - Standard Lift Linkage
    Ground to Top of ROPS - 13.8 ft - -
    Ground to Top of Exhaust Stacks - 14.8 ft - -
    Ground to Top of Hood - 10.9 ft - -
    Rear Axle - Centerline to Bumper - 10.5 ft - -
    Front Axle Centerline to Bucket Tip - 14 ft - -
    Wheel Base - 14.9 ft - -
    Maximum Overall Length - 39.3 ft - -
    Ground to Lower Hitch Clearance - 1.9 ft - -
    Clearance at Maximum Lift - 11.9 ft - -
    B-Pin Height - Maximum Lift - 18 ft - -
    Maximum Overall Height - Bucket Raised - 24.5 ft - -
    Reach - Maximum Lift - 6.5 ft - -

    Dimensions (Approximate) - High Lift Linkage
    Ground to Top of ROPS - 13.8 ft - -
    Ground to Top of Exhaust Stacks - 14.8 ft - -
    Ground to Top of Hood - 10.9 ft - -
    Rear Axle - Centerline to Bumper - 10.5 ft - -
    Front Axle Centerline to Bucket Tip - 15.3 ft - -
    Wheel Base - 14.9 ft - -
    Maximum Overall Length - 40.7 ft - -
    Ground to Lower Hitch Clearance - 1.9 ft - -
    Clearance at Maximum Lift - 13.3 ft - -
    B-Pin Height - Maximum Lift - 19.3 ft - -
    Maximum Overall Height - Bucket Raised - 25.8 ft - -
    Reach - Maximum Lift - 6.8 ft - -

    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.
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