Cat® Large Wheel Loaders are designed with durability built in, ensuring maximum availability through multiple life cycles. With optimized performance and simplified serviceability, our machines allow you to move more material efficiently and safely at a lower cost per ton.
Introduced in 1963, the 988 has been the industry leader for over 50 years, built on a legacy of reliability, performance, safety, operator comfort, serviceability, and productivity. The 988K XE brings improved sustainability and maximum efficiency to this machine platform.
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Engine
- Net Power
- 541 HP
- Engine Model
- Cat® C18 ™
- Bore
- 5.7 in
- Stroke
- 7.2 in
- Displacement
- 1,105 in³
- Rated Speed
- 1,700 rpm
- Peak Torque @ (speed) - SAE J1995
- 2,104 ft·lbf
- Net Power - SAE J1349
- 541 HP
- Torque Rise
- 58%
- Peak Power Speed - 1,500 rpm - Gross - ISO 14396
- 580 HP
- Emissions
- U.S. EPA Tier 4 Final/EU Stage V
- Peak Power Speed - 1,500 rpm - Gross - SAE J1995
- 588 HP
- Gross Power - ISO 14396
- 580 HP
- Peak Power Speed
- 1,500 rpm
- Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
- 541 HP
Operating Specifications
- Operating Weight
- 116,362 lb
- Rated Payload - Standard (Quarry Face)
- 12.5 ton (US)
- Rated Payload - Loose Material (Standard)
- 16 ton (US)
- Bucket Capacity Range
- 4.7-13 m3 (6.2-17 yd3)
- Operating Weight - Standard
- 116,362 lb
- Operating Weight - High Lift
- 119,618 lb
Buckets
- Bucket Capacities
- 4.7-13 m3 (6.2-17 yd3)
Transmission
- Transmission Type
- Cat switched reluctance electric drive
- Forward 4 (virtual)
- 20 mile/h
- Reverse 3 (virtual)
- 17.5 mile/h
- Forward 2 (virtual)
- 7 mile/h
- Reverse 2 (virtual)
- 7 mile/h
- Forward 3 (virtual)
- 13.8 mile/h
- Reverse 1 (virtual)
- 4.3 mile/h
- Forward 1 (virtual)
- 4.3 mile/h
Axles
- Front
- Fixed
- Rear
- Trunnion
- Oscillation Angle
- 13°
Service Refill Capacities
- Fuel Tank
- 147 gal (US)
- Transmission
- 16 gal (US)
- Cooling System - Jacket Water
- 30 gal (US)
- Differential - Final Drives - Rear
- 49 gal (US)
- Cooling Systems - Power Train
- 8 gal (US)
- Differential - Final Drives - Front
- 49 gal (US)
- Engine Crankcase
- 16 gal (US)
- Diesel Exhaust Fluid Tank
- 8.7 gal (US)
- Hydraulic System - Implement/Steering
- 126 gal (US)
- Note
- All non-road Tier 4 Final/Stage IV diesel engines are required to use: – The machine has the flexibility to run on either ultra-low-sulfur diesel fuel (ULSD with 15 ppm of sulfur or less) or up to B20 biodiesel when feedstock meeting ASTM D7,467 specificat
Hydraulic System - Lift/Tilt
- Lift Cylinder - Bore
- 8.7 in
- Lift/Tilt System - Pump
- Variable displacement piston
- Lift/Tilt System - Circuit
- EH-Positive Flow Control, Flow Sharing
- Maximum Flow at 1,400-1,600 rpm
- 153 gal/min
- Lift Cylinder - Stroke
- 41.3 in
- Relief Valve Setting - Lift/Tilt
- 4,757 psi
- Tilt Cylinder - Bore
- 8.7 in
- Tilt Cylinder - Stroke
- 27 in
Hydraulic System - Steering
- Steering Cycle Times - High Idle
- 3.4 s
- Total Steering Angle
- 86°
- Maximum Flow at 1,400-1,600 rpm
- 71.3 gal/min
- Steering Cycle Times - Low Idle
- 5.6 s
- Steering Cut Off Pressure
- 4,351 psi
- Steering System - Circuit
- Pilot, load sensing
- Steering System - Pump
- Piston, variable displacement
- Steering
- ISO 5,010:2,007
Hydraulic Cycle Times
- Rack Back
- 4.5 s
- Raise
- 8 s
- Lower Float Down
- 3.5 s
- Total Hydraulic Cycle Time
- 18.2 s
- Dump
- 2.2 s
Sound Performance - Tier 4 Final/Stage IV
- Machine Sound Level (ISO 6395)
- 109 dB(A)
- Operator Sound Level (ISO 6396)
- 72 dB(A)
- Note (1)
- The operator sound pressure level was measured according to the test procedures and conditions specified in ISO 6,396:2,008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
- Note (2)
- 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.
- Note (3)
- The machine sound power level was measured according to the test procedures and conditions specified in ISO 6,395:2,008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
Dimensions (Approximate) - Standard Lift
- Rear Axle - Centerline to Bumper
- 10.5 ft
- Note
- Specs are calculated with 6.9 m3 (9.0 yd3) rock bucket and Michelin XLDD2 with 978 mm (3.2 ft) centerline of rear axle height.
- Maximum Overall Height - Bucket Raised
- 24.5 ft
- Ground to Top of ROPS
- 13.7 ft
- Ground to Top of Exhaust Stacks
- 14.8 ft
- Wheel Base
- 14.9 ft
- B-Pin Height - Maximum Lift
- 18 ft
- Reach - Maximum Lift
- 6.8 ft
- Maximum Overall Length
- 40 ft
- Ground to Bumper Clearance
- 3.1 ft
- Ground to Lower Hitch Clearance
- 1.9 ft
- Ground to Center of Axles
- 3.2 ft
- Front Axle Centerline to Bucket Tip
- 14.7 ft
- Clearance at Maximum Lift
- 11.3 ft
- Ground to Top of Hood
- 10.9 ft
Dimensions (Approximate) - High Lift
- Ground to Lower Hitch Clearance
- 1.9 ft
- B-Pin Height - Maximum Lift
- 19.3 ft
- Rear Axle - Centerline to Bumper
- 10.5 ft
- Clearance at Maximum Lift
- 12.7 ft
- Ground to Bumper Clearance
- 3.1 ft
- Ground to Top of Hood
- 10.9 ft
- Front Axle Centerline to Bucket Tip
- 15.9 ft
- Ground to Top of Exhaust Stacks
- 14.8 ft
- Reach - Maximum Lift
- 7 ft
- Maximum Overall Length
- 41.3 ft
- Wheel Base
- 14.9 ft
- Ground to Top of ROPS
- 13.7 ft
- Ground to Center of Axles
- 3.2 ft
- Note
- Specs are calculated with 6.9 m3 (9.0 yd3) rock bucket and Michelin XLDD2 with 978 mm (3.2 ft) centerline of rear axle height.
- Maximum Overall Height - Bucket Raised
- 25.8 ft
Air Conditioning System
- Air Conditioning
- The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1,430). The system contains 1.8 kg of refrigerant which has a CO2 equivalent of 2.574 metric tonnes.
Operator's Cab
- ROPS/FOPS
- ROPS/FOPS meet ISO 3,471:2,008 and ISO 3,449:2,005 Level II standards
Brakes
- Brakes
- ISO 3,450:2,011
Standard Equipment:
-
- Note
-
- Standard and optional equipment may vary. Consult your Cat dealer for details.
-
- Electrical
-
- Alarm, back-up
- Alternator, single 150 amp
- Batteries, dry
- Converter, 10/15 amp, 24V to 12V
- Lighting system (halogen, work lights, access and service platform lighting)
- Starting and charging system, 24V
- Starter emergency start receptacle
- Starter lockout in bumper
- Transmission lockout in bumper
- Hazardous voltage lamp
-
- Operator Environment
-
- Graphical Information Display, displays real time operating information, performs calibrations and customizes operator settings
- Air conditioner
- Cat Detect Vision, rear vision camera system
- Cab, sound suppressed and pressurized, integrated rollover protective structure (ROPS/FOPS) radio ready for entertainment, includes antenna, speakers and converter (12‑volt 5-amp) and power port
- Controls, lift and tilt function
- Heater, defroster
- Horn, electric
- Instrumentation, gauges
– Coolant temperature
– Engine hour meter
– Hydraulic oil temperature
– Power train oil temperature - Light, cab, dome
- Lunchbox, beverage holders
- CB radio-ready
- Mirrors, rearview (externally mounted)
- Rimpull Control System
- Seat, Cat Comfort Series III, heated and ventilated, air suspension, six-way adjustable
- Seat belt minder
- Seat belt, retractable, 76 mm (3 in) wide
- STIC Control System
- UV glass
- Virtual gear indicator
- Vital Information Management System (VIMS) with Graphical Information Display: External Data Port, Customizable Operator Profiles, Cycle Timer, Integrated Payload Control System
- Wet-Arm wipers/washers (front and rear)
– Intermittent front and rear wipers - Lights, directional
-
- Power Train
-
- Brakes, oil-cooled, multi-disc, service/secondary
- Case drain screens
- Electro hydraulic parking brake
- Engine, C18 MEUI diesel, turbocharged/aftercooled
- Ground level engine shutoff
- Turbine precleaner, engine air intake
- Radiator, Aluminum Modular Radiator (AMR)
- Starting aid, ether, automatic
- Throttle lock, electronic
- Manual switch and automatic fuel priming
- Cat Production Measurement ready
- Cat SR Generator/Pump Drive
- Cat SR Drive Motor
- Cat Integrated Powered Electronics
- Automatic retarding controls
-
- Other
-
- Automatic bucket lift kickout/positioner
- Base machine price includes a rim allowance
- Hydraulically driven demand fan
- Couplings, Cat O-ring face seals
- Doors, service access (locking)
- Ecology drains for engine, radiator, hydraulic tank
- Fuel tank, 555 L (147 gal)
- Hitch, drawbar with pin
- Hoses, Cat XT™
- Hydraulic, steering and brake filtration/screening system
- Cat Clean Emission Module
- Oil sampling valves
- Premixed 50 percent concentration of extended life coolant with freeze protection to –34° C (–29° F)
- Rear access to cab and service platform
- Steering, load sensing
- Toe kicks
- Vandalism protection caplocks
Optional Equipment:
-
- Note
-
- Standard and optional equipment may vary. Consult your Cat dealer for details.
-
- Power Train
-
- –50° C (–58° F) antifreeze
- Engine oil change system, high speed, Wiggins
- Engine block heater 120V or 240V
- High ambient cooling – software
- Cat Production Measurement
- Crankcase guard
-
- Operator Environment
-
- Cab precleaner
- AM/FM/CD/MP3 radio
- Satellite Sirius radio with Bluetooth®
- LED warning strobe
- Window pull down visor
- Handrail mounted mirrors
-
- Miscellaneous Attachments
-
- Front and rear roading fenders
- Fast fill fuel system (Shaw-Aero)
- Cold Weather Starting (extra starter plus two batteries)
- Aggregate Handler
- Tire Pressure Monitoring System
Specifications
Engine
- Net Power
- 541 HP
- Engine Model
- Cat® C18 ™
- Bore
- 5.7 in
- Stroke
- 7.2 in
- Displacement
- 1,105 in³
- Rated Speed
- 1,700 rpm
- Peak Torque @ (speed) - SAE J1995
- 2,104 ft·lbf
- Net Power - SAE J1349
- 541 HP
- Torque Rise
- 58%
- Peak Power Speed - 1,500 rpm - Gross - ISO 14396
- 580 HP
- Emissions
- U.S. EPA Tier 4 Final/EU Stage V
- Peak Power Speed - 1,500 rpm - Gross - SAE J1995
- 588 HP
- Gross Power - ISO 14396
- 580 HP
- Peak Power Speed
- 1,500 rpm
- Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
- 541 HP
Operating Specifications
- Operating Weight
- 116,362 lb
- Rated Payload - Standard (Quarry Face)
- 12.5 ton (US)
- Rated Payload - Loose Material (Standard)
- 16 ton (US)
- Bucket Capacity Range
- 4.7-13 m3 (6.2-17 yd3)
- Operating Weight - Standard
- 116,362 lb
- Operating Weight - High Lift
- 119,618 lb
Buckets
- Bucket Capacities
- 4.7-13 m3 (6.2-17 yd3)
Transmission
- Transmission Type
- Cat switched reluctance electric drive
- Forward 4 (virtual)
- 20 mile/h
- Reverse 3 (virtual)
- 17.5 mile/h
- Forward 2 (virtual)
- 7 mile/h
- Reverse 2 (virtual)
- 7 mile/h
- Forward 3 (virtual)
- 13.8 mile/h
- Reverse 1 (virtual)
- 4.3 mile/h
- Forward 1 (virtual)
- 4.3 mile/h
Axles
- Front
- Fixed
- Rear
- Trunnion
- Oscillation Angle
- 13°
Service Refill Capacities
- Fuel Tank
- 147 gal (US)
- Transmission
- 16 gal (US)
- Cooling System - Jacket Water
- 30 gal (US)
- Differential - Final Drives - Rear
- 49 gal (US)
- Cooling Systems - Power Train
- 8 gal (US)
- Differential - Final Drives - Front
- 49 gal (US)
- Engine Crankcase
- 16 gal (US)
- Diesel Exhaust Fluid Tank
- 8.7 gal (US)
- Hydraulic System - Implement/Steering
- 126 gal (US)
- Note
- All non-road Tier 4 Final/Stage IV diesel engines are required to use: – The machine has the flexibility to run on either ultra-low-sulfur diesel fuel (ULSD with 15 ppm of sulfur or less) or up to B20 biodiesel when feedstock meeting ASTM D7,467 specificat
Hydraulic System - Lift/Tilt
- Lift Cylinder - Bore
- 8.7 in
- Lift/Tilt System - Pump
- Variable displacement piston
- Lift/Tilt System - Circuit
- EH-Positive Flow Control, Flow Sharing
- Maximum Flow at 1,400-1,600 rpm
- 153 gal/min
- Lift Cylinder - Stroke
- 41.3 in
- Relief Valve Setting - Lift/Tilt
- 4,757 psi
- Tilt Cylinder - Bore
- 8.7 in
- Tilt Cylinder - Stroke
- 27 in
Hydraulic System - Steering
- Steering Cycle Times - High Idle
- 3.4 s
- Total Steering Angle
- 86°
- Maximum Flow at 1,400-1,600 rpm
- 71.3 gal/min
- Steering Cycle Times - Low Idle
- 5.6 s
- Steering Cut Off Pressure
- 4,351 psi
- Steering System - Circuit
- Pilot, load sensing
- Steering System - Pump
- Piston, variable displacement
- Steering
- ISO 5,010:2,007
Hydraulic Cycle Times
- Rack Back
- 4.5 s
- Raise
- 8 s
- Lower Float Down
- 3.5 s
- Total Hydraulic Cycle Time
- 18.2 s
- Dump
- 2.2 s
Sound Performance - Tier 4 Final/Stage IV
- Machine Sound Level (ISO 6395)
- 109 dB(A)
- Operator Sound Level (ISO 6396)
- 72 dB(A)
- Note (1)
- The operator sound pressure level was measured according to the test procedures and conditions specified in ISO 6,396:2,008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
- Note (2)
- 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.
- Note (3)
- The machine sound power level was measured according to the test procedures and conditions specified in ISO 6,395:2,008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.
Dimensions (Approximate) - Standard Lift
- Rear Axle - Centerline to Bumper
- 10.5 ft
- Note
- Specs are calculated with 6.9 m3 (9.0 yd3) rock bucket and Michelin XLDD2 with 978 mm (3.2 ft) centerline of rear axle height.
- Maximum Overall Height - Bucket Raised
- 24.5 ft
- Ground to Top of ROPS
- 13.7 ft
- Ground to Top of Exhaust Stacks
- 14.8 ft
- Wheel Base
- 14.9 ft
- B-Pin Height - Maximum Lift
- 18 ft
- Reach - Maximum Lift
- 6.8 ft
- Maximum Overall Length
- 40 ft
- Ground to Bumper Clearance
- 3.1 ft
- Ground to Lower Hitch Clearance
- 1.9 ft
- Ground to Center of Axles
- 3.2 ft
- Front Axle Centerline to Bucket Tip
- 14.7 ft
- Clearance at Maximum Lift
- 11.3 ft
- Ground to Top of Hood
- 10.9 ft
Dimensions (Approximate) - High Lift
- Ground to Lower Hitch Clearance
- 1.9 ft
- B-Pin Height - Maximum Lift
- 19.3 ft
- Rear Axle - Centerline to Bumper
- 10.5 ft
- Clearance at Maximum Lift
- 12.7 ft
- Ground to Bumper Clearance
- 3.1 ft
- Ground to Top of Hood
- 10.9 ft
- Front Axle Centerline to Bucket Tip
- 15.9 ft
- Ground to Top of Exhaust Stacks
- 14.8 ft
- Reach - Maximum Lift
- 7 ft
- Maximum Overall Length
- 41.3 ft
- Wheel Base
- 14.9 ft
- Ground to Top of ROPS
- 13.7 ft
- Ground to Center of Axles
- 3.2 ft
- Note
- Specs are calculated with 6.9 m3 (9.0 yd3) rock bucket and Michelin XLDD2 with 978 mm (3.2 ft) centerline of rear axle height.
- Maximum Overall Height - Bucket Raised
- 25.8 ft
Air Conditioning System
- Air Conditioning
- The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1,430). The system contains 1.8 kg of refrigerant which has a CO2 equivalent of 2.574 metric tonnes.
Operator's Cab
- ROPS/FOPS
- ROPS/FOPS meet ISO 3,471:2,008 and ISO 3,449:2,005 Level II standards
Brakes
- Brakes
- ISO 3,450:2,011
Standard/Optional Features
Standard Equipment:
-
- Note
-
- Standard and optional equipment may vary. Consult your Cat dealer for details.
-
- Electrical
-
- Alarm, back-up
- Alternator, single 150 amp
- Batteries, dry
- Converter, 10/15 amp, 24V to 12V
- Lighting system (halogen, work lights, access and service platform lighting)
- Starting and charging system, 24V
- Starter emergency start receptacle
- Starter lockout in bumper
- Transmission lockout in bumper
- Hazardous voltage lamp
-
- Operator Environment
-
- Graphical Information Display, displays real time operating information, performs calibrations and customizes operator settings
- Air conditioner
- Cat Detect Vision, rear vision camera system
- Cab, sound suppressed and pressurized, integrated rollover protective structure (ROPS/FOPS) radio ready for entertainment, includes antenna, speakers and converter (12‑volt 5-amp) and power port
- Controls, lift and tilt function
- Heater, defroster
- Horn, electric
- Instrumentation, gauges
– Coolant temperature
– Engine hour meter
– Hydraulic oil temperature
– Power train oil temperature - Light, cab, dome
- Lunchbox, beverage holders
- CB radio-ready
- Mirrors, rearview (externally mounted)
- Rimpull Control System
- Seat, Cat Comfort Series III, heated and ventilated, air suspension, six-way adjustable
- Seat belt minder
- Seat belt, retractable, 76 mm (3 in) wide
- STIC Control System
- UV glass
- Virtual gear indicator
- Vital Information Management System (VIMS) with Graphical Information Display: External Data Port, Customizable Operator Profiles, Cycle Timer, Integrated Payload Control System
- Wet-Arm wipers/washers (front and rear)
– Intermittent front and rear wipers - Lights, directional
-
- Power Train
-
- Brakes, oil-cooled, multi-disc, service/secondary
- Case drain screens
- Electro hydraulic parking brake
- Engine, C18 MEUI diesel, turbocharged/aftercooled
- Ground level engine shutoff
- Turbine precleaner, engine air intake
- Radiator, Aluminum Modular Radiator (AMR)
- Starting aid, ether, automatic
- Throttle lock, electronic
- Manual switch and automatic fuel priming
- Cat Production Measurement ready
- Cat SR Generator/Pump Drive
- Cat SR Drive Motor
- Cat Integrated Powered Electronics
- Automatic retarding controls
-
- Other
-
- Automatic bucket lift kickout/positioner
- Base machine price includes a rim allowance
- Hydraulically driven demand fan
- Couplings, Cat O-ring face seals
- Doors, service access (locking)
- Ecology drains for engine, radiator, hydraulic tank
- Fuel tank, 555 L (147 gal)
- Hitch, drawbar with pin
- Hoses, Cat XT™
- Hydraulic, steering and brake filtration/screening system
- Cat Clean Emission Module
- Oil sampling valves
- Premixed 50 percent concentration of extended life coolant with freeze protection to –34° C (–29° F)
- Rear access to cab and service platform
- Steering, load sensing
- Toe kicks
- Vandalism protection caplocks
Optional Equipment:
-
- Note
-
- Standard and optional equipment may vary. Consult your Cat dealer for details.
-
- Power Train
-
- –50° C (–58° F) antifreeze
- Engine oil change system, high speed, Wiggins
- Engine block heater 120V or 240V
- High ambient cooling – software
- Cat Production Measurement
- Crankcase guard
-
- Operator Environment
-
- Cab precleaner
- AM/FM/CD/MP3 radio
- Satellite Sirius radio with Bluetooth®
- LED warning strobe
- Window pull down visor
- Handrail mounted mirrors
-
- Miscellaneous Attachments
-
- Front and rear roading fenders
- Fast fill fuel system (Shaw-Aero)
- Cold Weather Starting (extra starter plus two batteries)
- Aggregate Handler
- Tire Pressure Monitoring System