988K XE Wheel Loader

Overview
Net Power
541 hp
Operating Weight
116,362 lb
Bucket Capacities
4.7-13 m3 (6.2-17 yd3)
  • Exterior View
  • Interior View

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.

Engine

Net Power
541 hp
Engine Model
Cat® C18 ACERT™
Net Power – SAE J1349
541 hp
Bore
6 in
Stroke
7 in
Displacement
1,105 in3
Torque Rise
58%
Rated Speed
1,700 rpm
Emissions
U.S. EPA Tier 4 Final/EU Stage IV
Gross Power – ISO 14396
580 hp
Peak Torque @ (speed) – SAE J1995
2,104 lbf-ft
Peak Power Speed
1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396
580 HP
Peak Power Speed - 1,500 rpm - Gross - SAE J1995
588 HP
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
541 HP
Net Power
541 HP
Engine Model
Cat® C18 ACERT™
Bore
6 in
Stroke
7 in
Displacement
1,105 in³
Rated Speed
1,700 rpm
Emissions
U.S. EPA Tier 4 Final/EU Stage IV
Gross Power - ISO 14396
580 HP
Net Power - SAE J1349
541 HP
Peak Torque @ (speed) - SAE J1995
2,104 ft·lbf
Torque Rise
58%

Operating Specifications

Operating Weight
116,362 lb
Rated Payload – Standard (face material)
13 tons
Rated Payload – Standard (loose material)
16 tons
Rated Payload – High Lift (face material)
13 tons
Rated Payload – High Lift (loose material)
16 tons
Bucket Capacity Range
4.7-13 m3 (6.2-17 yd3)
Operating Weight – Standard
116,362 lb
Operating Weight – High Lift
119,618 lb
Operating Weight
116,362 lb
Rated Payload - High Lift (Face Material)
13 t
Rated Payload - High Lift (Loose Material)
16 t
Rated Payload - Standard (Face Material)
13 t
Rated Payload - Standard (Loose Material)
16 t
Operating Weight - High Lift
119,618 lb
Operating Weight - Standard
116,362 lb

Buckets

Bucket Capacities
4.7-13 m3 (6.2-17 yd3)
Bucket Capacities
4.7-13 m3 (6.2-17 yd3)

Transmission

Transmission Type
Cat switched reluctance electric drive
Forward 1 (virtual)
4 mile/h
Forward 2 (virtual)
7 mile/h
Forward 3 (virtual)
14 mile/h
Forward 4 (virtual)
20 mile/h
Reverse 1 (virtual)
4 mile/h
Reverse 2 (virtual)
7 mile/h
Reverse 3 (virtual)
18 mile/h
Transmission Type
Cat switched reluctance electric drive

Axles

Front
Fixed
Rear
Trunnion
Oscillation Angle
13°
Front
Fixed
Rear
Trunnion
Oscillation Angle
13°

Hydraulic System – Steering

Steering System – Circuit
Pilot, load sensing
Steering System – Pump
Piston, variable displacement
Steering Cut Off Pressure
4,351 psi
Total Steering Angle
86°
Steering Cycle Time (high idle)
3 sec
Steering Cycle Time (low idle)
6 sec

Service Refill Capacities

Fuel Tank
147 gal
Cooling System (jacket water)
30 gal
Cooling Systems (power train)
8 gal
Engine Crankcase
16 gal
Diesel Exhaust Fluid Tank
9 gal
Transmission
16 gal
Differentials and final drives – front
49 gal
Differentials and final drives – rear
49 gal
Hydraulic System – implement/steering
126 gal
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 D7467 specificat
Fuel Tank
147 gal (US)
Transmission
16 gal (US)
Cooling System - Jacket Water
30 gal (US)
Cooling Systems - Power Train
8 gal (US)
Diesel Exhaust Fluid Tank
9 gal (US)
Differential - Final Drives - Front
49 gal (US)
Differential - Final Drives - Rear
49 gal (US)
Engine Crankcase
16 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 D7467 specificat

Hydraulic System Lift/Tilt

Lift/Tilt System Pumps
Variable displacement piston
Lift Cylinder – Bore
9 in
Lift Cylinder – Stroke
41 in
Tilt Cylinder – Bore
9 in
Tilt Cylinder – Stroke
27 in
Lift/Tilt System – Circuit
EH-Positive Flow Control, Flow Sharing
Relief Valve Setting – Lift/Tilt
4,757 psi

Hydraulic Cycle Time

Rackback
5 Seconds
Raise
8 Seconds
Dump
2 Seconds
Lower Float Down
4 Seconds
Total Hydraulic Cycle Time
18 Seconds

Brakes

Brakes
ISO 3450:2011
Brakes
ISO 3450:2011

Hydraulic System - Steering

Maximum Flow at 1,400-1,600 rpm
71 gal/min
Steering
ISO 5010:2007
Steering Cut Off Pressure
4,351 psi
Steering Cycle Times - High Idle
3 s
Steering Cycle Times - Low Idle
6 s
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Total Steering Angle
86°

Sound Performance - Tier 4 Final/Stage IV

Operator Sound Level (ISO 6396)
72 dB(A)
Machine Sound Level (ISO 6395)
109 dB(A)
Note (1)
The operator sound pressure level was measured according to the test procedures and conditions specified in ISO 6396:2008. 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 6395:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed.

Hydraulic System - Lift/Tilt

Maximum Flow at 1,400-1,600 rpm
153 gal/min
Lift Cylinder - Bore
9 in
Lift Cylinder - Stroke
41 in
Lift/Tilt System - Circuit
EH-Positive Flow Control, Flow Sharing
Lift/Tilt System - Pump
Variable displacement piston
Relief Valve Setting - Lift/Tilt
4,757 psi
Tilt Cylinder - Bore
9 in
Tilt Cylinder - Stroke
27 in

Air Conditioning System

Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.8 kg of refrigerant which has a CO2 equivalent of 2.574 metric tonnes.
Air Conditioning
The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.8 kg of refrigerant which has a CO2 equivalent of 2.574 metric tonnes.

Operator Cab

ROPS/FOPS
ROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards

Dimensions (Approximate) - Standard Lift

Ground to Top of ROPS
14 ft
Ground to Top of Exhaust Stacks
15 ft
Ground to Top of Hood
11 ft
Ground to Bumper Clearance
3 ft
Rear Axle - Centerline to Bumper
11 ft
Front Axle Centerline to Bucket Tip
15 ft
Wheel Base
15 ft
Maximum Overall Length
40 ft
Ground to Lower Hitch Clearance
2 ft
Ground to Center of Axles
3 ft
Clearance at Maximum Lift
11 ft
B-Pin Height - Maximum Lift
18 ft
Maximum Overall Height - Bucket Raised
25 ft
Reach - Maximum Lift
7 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.

Dimensions (Approximate) - High Lift

Ground to Top of ROPS
14 ft
Ground to Top of Exhaust Stacks
15 ft
Ground to Top of Hood
11 ft
Ground to Bumper Clearance
3 ft
Rear Axle - Centerline to Bumper
11 ft
Front Axle Centerline to Bucket Tip
16 ft
Maximum Overall Length
41 ft
Ground to Lower Hitch Clearance
2 ft
Ground to Center of Axles
3 ft
Clearance at Maximum Lift
13 ft
B-Pin Height - Maximum Lift
19 ft
Maximum Overall Height - Bucket Raised
26 ft
Reach - Maximum Lift
7 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.
Wheel Base
15 ft

Dimensions (Approximate) – High Lift

Wheel Base
15 ft

Hydraulic Cycle Times

Dump
2 s
Lower Float Down
4 s
Rack Back
5 s
Raise
8 s
Total Hydraulic Cycle Time
18 s

Operator's Cab

ROPS/FOPS
ROPS/FOPS meet ISO 3471:2008 and ISO 3449:2005 Level II standards

Efficiency

Power Train

Structures

Hydraulics

Operator Station

Technology Solutions

Serviceability

Customer Support

Safety

Sustainability

System Match Efficiency

Bucket Ground Engaging Tools

  • 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 ACERT 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
  • 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
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