Wheel Loaders

988K Wheel Loader Steel Mill Arrangement

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Specification Summary

Net Power
541 HP
Operating Weight
112574 lb
Bucket Capacities
5.4-6.3 m3 (7.0-8.3 yd3)
Engine Model
Cat® C18 ACERT™
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Engine

Net Power
541 HP
Engine Model
Cat® C18 ACERT™
Net Power - SAE J1349
541 HP
Bore
5.7 in
Stroke
7.2 in
Displacement
1105 in³
Torque Rise
58 %
Rated Speed
1,700 rpm
Gross - ISO 14396
580 HP
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
Peak Torque - 1,200 rpm
2104 lb/ft
Emissions
U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent

Operating Specifications

Operating Weight
112574 lb
Rated Payload
12.5 t
Rated Payload - Standard
12.5 t
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 t

Transmission

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

Hydraulic System - Lift/Tilt

Lift/Tilt System
Variable displacement piston
Maximum Flow
13.7 gal/min
Relief Valve Setting
551 psi
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)
Maximum Flow at 1,400-1,860 rpm
153 gal/min
Pilot System
Variable displacement piston
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt
4757 psi

Service Refill Capacities

Fuel Tank
181 gal (US)
Cooling System
31.7 gal (US)
Crankcase
15.9 gal (US)
Transmission
31.7 gal (US)
Differential - Final Drives - Front
49.1 gal (US)
Differential - Final Drives - Rear
49.1 gal (US)
Hydraulic System - Tank Only
63.4 gal (US)
Diesel Exhaust Fluid Tank (Tier 4)
8.7 gal (US)
Hydraulic System Factory Fill
125.5 gal (US)

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 psi
Maximum Flow
71.3 gal/min
Steering Cycle Times - High Idle
3.4 s
Steering Cycle Times - Low Idle
5.6 s
Total Steering Angle
80 °

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

Dump
2.2 s
Lower Float Down
3.5 s
Rack Back
4.5 s
Raise
8 s
Total Hydraulic Cycle Time - Empty Bucket
18.2 s

Sound Performance - Standard

Machine Sound Level (ISO 6395)
111 dB(A)
Operator Sound Level (ISO 6396)
71 dB(A)

Sound Performance - Suppression

Machine Sound Level (ISO 6395)
109 dB(A)
Operator Sound Level (ISO 6396)
70 dB(A)
Net Power
541 HP
Engine Model
Cat® C18 ACERT™
Net Power - SAE J1349
541 HP
Bore
5.7 in
Stroke
7.2 in
Displacement
1105 in³
Torque Rise
58 %
Rated Speed
1,700 rpm
Gross - ISO 14396
580 HP
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
Peak Torque - 1,200 rpm
2104 lb/ft
Emissions
U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent
Operating Weight
112574 lb
Rated Payload
12.5 t
Rated Payload - Standard
12.5 t
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 t
Transmission Type
Cat planetary power shift
Forward - 1
4 mile/h
Forward - 2
7.2 mile/h
Forward - 3
12.7 mile/h
Forward - 4
21.6 mile/h
Reverse - 1
4.7 mile/h
Reverse - 2
8.3 mile/h
Reverse - 3
14.4 mile/h
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 2
7.8 mile/h
Direct Drive - Forward 3
13.9 mile/h
Direct Drive - Forward 4
24.4 mile/h
Direct Drive - Reverse 1
5 mile/h
Direct Drive - Reverse 2
8.9 mile/h
Direct Drive - Reverse 3
15.8 mile/h
Lift/Tilt System
Variable displacement piston
Maximum Flow
13.7 gal/min
Relief Valve Setting
551 psi
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)
Maximum Flow at 1,400-1,860 rpm
153 gal/min
Pilot System
Variable displacement piston
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt
4757 psi
Fuel Tank
181 gal (US)
Cooling System
31.7 gal (US)
Crankcase
15.9 gal (US)
Transmission
31.7 gal (US)
Differential - Final Drives - Front
49.1 gal (US)
Differential - Final Drives - Rear
49.1 gal (US)
Hydraulic System - Tank Only
63.4 gal (US)
Diesel Exhaust Fluid Tank (Tier 4)
8.7 gal (US)
Hydraulic System Factory Fill
125.5 gal (US)
Bucket Capacities
5.4-6.3 m3 (7.0-8.3 yd3)
Front
Fixed
Rear
Trunnion
Oscillation Angle
±6°
Brakes
SAE J1473 OCT90, ISO 3450:1992
Steering System - Circuit
Pilot, load sensing
Steering System - Pump
Piston, variable displacement
Relief Valve Setting - Steering
4351 psi
Maximum Flow
71.3 gal/min
Steering Cycle Times - High Idle
3.4 s
Steering Cycle Times - Low Idle
5.6 s
Total Steering Angle
80 °
Dump
2.2 s
Lower Float Down
3.5 s
Rack Back
4.5 s
Raise
8 s
Total Hydraulic Cycle Time - Empty Bucket
18.2 s
Machine Sound Level (ISO 6395)
111 dB(A)
Operator Sound Level (ISO 6396)
71 dB(A)
Machine Sound Level (ISO 6395)
109 dB(A)
Operator Sound Level (ISO 6396)
70 dB(A)