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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 50 years. Focused on helping our customers succeed, we have continued to build upon each new series. The 988K continues our legacy of reliability, performance, safety, operator comfort, serviceability, and efficiency.

Cat Specs
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Engine

Net Power
541 HP
Bore
5.7 in
Stroke
7.2 in
Displacement
1105 in³
Torque Rise
58 %
Rated Speed
1,700 rpm
Net Power - SAE J1349
541 HP
Emissions
U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent
Engine Model
Cat® C18 ACERT™
Peak Torque - 1,200 rpm
2104 lb/ft

Operating Specifications

Operating Weight
112574 lb
Bucket Capacity Range
6.4-7.6 m3 (8.3-10 yd3)
Cat Truck Match - Standard
770-772
Cat Truck Match - High Lift
773-775

Buckets

Bucket Capacities
5.4-6.3 m3 (7.0-8.3 yd3)

Hydraulic System - Lift/Tilt

Lift/Tilt System
Variable displacement piston
Pilot System
Variable displacement piston
Cylinders, Double Acting - Lift, Bore and Stroke
210 mm × 1050 mm (8.3 in × 41.3 in)
Relief Valve Setting - Lift/Tilt
4757 psi
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing

Hydraulic System - Steering

Relief Valve Setting - Steering
4351 psi
Steering Cycle Times - High Idle
3.4 s
Steering Cycle Times - Low Idle
5.6 s
Total Steering Angle
80 °
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement

Transmission

Transmission Type
Cat planetary power shift
Forward - 1
4 mile/h
Forward - 2
7.2 mile/h
Reverse - 1
4.7 mile/h
Reverse - 2
8.3 mile/h
Direct Drive - Forward 3
13.9 mile/h
Forward - 4
21.6 mile/h
Direct Drive - Reverse 3
15.8 mile/h
Reverse - 3
14.4 mile/h
Direct Drive - Forward 4
24.4 mile/h
Direct Drive - Forward 2
7.8 mile/h
Forward - 3
12.7 mile/h
Direct Drive - Reverse 2
8.9 mile/h

Axles

Front
Fixed
Rear
Trunnion
Oscillation Angle
±6°

Service Refill Capacities

Crankcase
15.9 gal (US)
Cooling System
31.7 gal (US)
Transmission
31.7 gal (US)
Hydraulic System - Tank Only
63.4 gal (US)
Differential - Final Drives - Front
49.1 gal (US)
Hydraulic System Factory Fill
125.5 gal (US)
Differential - Final Drives - Rear
49.1 gal (US)
Fuel Tank
181 gal (US)

Brakes

Brakes
SAE J1473 OCT90, ISO 3450:1992