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988K Wheel Loader Steel Mill Arrangement

988K Wheel Loader Steel Mill Arrangement

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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.

Engine

Net Power
541.0 hp
Engine Model
Cat® C18 ACERT™
Net Power - SAE J1349
541.0 hp
Bore
5.7 in
Stroke
7.2 in
Displacement
1105.0 in3
Torque Rise
58.0 %
Rated Speed
1,700 rpm
Emissions
U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent
Gross (ISO 14396)
580.0 hp
Peak Power Speed
1,500 rpm
Peak Power Speed @ 1,500 rpm: Gross - ISO 14396
580.0 hp
Peak Power Speed @ 1,500 rpm: Gross - SAE J1995
588.0 hp
Peak Power Speed @ 1,500 rpm: Net Power - SAE J1349
541.0 hp
Peak Torque @ 1,200 rpm
2104.0 lb ft

Operating Specifications

Operating Weight
112574.0 lb
Rated Payload
12.5 tons
Rated Payload - Standard
12.5 tons
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
Rated Payload - High Lift
12.5 tons

Transmission

Transmission Type
Cat planetary power shift
Forward 1
4.0 mph
Forward 2
7.2 mph
Forward 3
12.7 mph
Forward 4
21.6 mph
Reverse 1
4.7 mph
Reverse 2
8.3 mph
Reverse 3
14.4 mph
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 2
7.8 mph
Direct Drive - Forward 3
13.9 mph
Direct Drive - Forward 4
24.4 mph
Direct Drive - Reverse 1
5.0 mph
Direct Drive - Reverse 2
8.9 mph
Direct Drive - Reverse 3
15.8 mph

Hydraulic System - Lift/Tilt

Cylinders, Double Acting: Lift, Bore and Stroke
210 mm × 1050 mm (8.3 in × 41.3 in)
Cylinders, Double Acting: Tilt, Bore and Stroke
267 mm × 685 mm (10.5 in × 27.0 in)
Lift/Tilt System
Variable displacement piston
Maximum Flow
13.7 gal/min
Maximum Flow at 1,400-1,860 rpm
153.0 gal/min
Pilot System
Variable displacement piston
Relief Valve Setting
551.0 psi
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt
4757.0 psi

Service Refill Capacities

Fuel Tank
181.0 gal
Cooling System
31.7 gal
Crankcase
15.9 gal
Transmission
31.7 gal
Differentials and Final Drives - Front
49.1 gal
Differentials and Final Drives - Rear
49.1 gal
Hydraulic System (tank only)
63.4 gal
Diesel Exhaust Fluid Tank (Tier 4)
8.7 gal
Hydraulic System Factory Fill
125.5 gal

Buckets

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

Axles

Front
Fixed
Rear
Trunnion
Oscillation Angle
±6°

Brakes

Brakes
SAE J1473 OCT90, ISO 3450:1992

Hydraulic System - Steering

Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Relief Valve Setting - Steering
4351.0 psi
Maximum Flow
71.3 gal/min
Steering Cycle Time (high idle)
3.4 Seconds
Steering Cycle Time (low idle)
5.6 Seconds
Total Steering Angle
80.0 Degrees

Hydraulic Cycle Time (1,400-1,860 rpm)

Dump
2.2 Seconds
Lower Float Down
3.5 Seconds
Rackback
4.5 Seconds
Raise
8.0 Seconds
Total Hydraulic Cycle Time (empty bucket)
18.2 Seconds

Sound Performance - Standard

Machine Sound Level (ISO 6395)
111.0 dB(A)
Operator Sound Level (ISO 6396)
71.0 dB(A)

Sound Performance - Suppression

Machine Sound Level (ISO 6395)
109.0 dB(A)
Operator Sound Level (ISO 6396)
70.0 dB(A)