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 HP
Engine Model
Cat® C18 ™
Net Power - SAE J1349
541 HP
Bore
5.7 in
Stroke
7.2 in
Displacement
1105 in³
Torque Rise
58 %
Rated Speed
1700/min
Emissions
Einhaltung von EPA Tier 4 Final (USA)/Stufe V (EU), Tier-2-konform
Gross - ISO 14396
580 HP
Peak Power Speed
1500/min
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

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

Buckets

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

Transmission

Transmission Type
Cat-Planetenlastschaltgetriebe
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

Axles

Front
Fixed
Rear
Trunnion
Oscillation Angle
±6°

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 °

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)

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 gal/min
Pilot System
Variable displacement piston
Relief Valve Setting - Main
551 psi
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt
4757 psi

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)

Brakes

Brakes
SAE J1473 OKT90, ISO 3450:1992