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988K Wheel Loader Steel Mill Arrangement

Overview

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.

988K Wheel Loader Steel Mill Arrangement - Specifications

Engine
Net Power
541 HP
403 kW
Engine Model
Cat® C18 ACERT™
Net Power - SAE J1349
541 HP
403 kW
Bore
5.7 in
145 mm
Stroke
7.2 in
183 mm
Displacement
1105 in³
18.1 l
Torque Rise
58 %
58 %
Rated Speed
1,700 rpm
Emissions
U.S. EPA Tier 4 Final/EU Stage IV, Tier 2 Equivalent
Gross - ISO 14396
580 HP
432 kW
Peak Power Speed
1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396
580 HP
432 kW
Peak Power Speed - 1,500 rpm - Gross - SAE J1995
588 HP
439 kW
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
541 HP
403 kW
Peak Torque - 1,200 rpm
2104 lb/ft
2852 N·m
Operating Specifications
Operating Weight
112574 lb
51062 kg
Rated Payload
12.5 t
11.3 t
Rated Payload - Standard
12.5 t
11.3 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
11.3 t
Buckets
Bucket Capacities
5.4-6.3 m3 (7.0-8.3 yd3)
Transmission
Transmission Type
Cat planetary power shift
Forward - 1
4 mile/h
6.5 km/h
Forward - 2
7.2 mile/h
11.6 km/h
Forward - 3
12.7 mile/h
20.4 km/h
Forward - 4
21.6 mile/h
34.7 km/h
Reverse - 1
4.7 mile/h
7.5 km/h
Reverse - 2
8.3 mile/h
13.3 km/h
Reverse - 3
14.4 mile/h
23.2 km/h
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 2
7.8 mile/h
12.5 km/h
Direct Drive - Forward 3
13.9 mile/h
22.3 km/h
Direct Drive - Forward 4
24.4 mile/h
39.3 km/h
Direct Drive - Reverse 1
5 mile/h
8 km/h
Direct Drive - Reverse 2
8.9 mile/h
14.3 km/h
Direct Drive - Reverse 3
15.8 mile/h
25.5 km/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
30000 kPa
Maximum Flow
71.3 gal/min
270 l/min
Steering Cycle Times - High Idle
3.4 s
3.4 s
Steering Cycle Times - Low Idle
5.6 s
5.6 s
Total Steering Angle
80 °
80 °
Service Refill Capacities
Fuel Tank
181 gal (US)
686 l
Cooling System
31.7 gal (US)
120 l
Crankcase
15.9 gal (US)
60 l
Transmission
31.7 gal (US)
120 l
Differential - Final Drives - Front
49.1 gal (US)
186 l
Differential - Final Drives - Rear
49.1 gal (US)
186 l
Hydraulic System - Tank Only
63.4 gal (US)
240 l
Hydraulic System Factory Fill
125.5 gal (US)
475 l
Diesel Exhaust Fluid Tank (Tier 4)
8.7 gal (US)
33 l
Hydraulic Cycle Time (1,400-1,860 rpm)
Dump
2.2 s
2.2 s
Lower Float Down
3.5 s
3.5 s
Total Hydraulic Cycle Time - Empty Bucket
18.2 s
18.2 s
Raise
8 s
8 s
Rack Back
4.5 s
4.5 s
Sound Performance - Standard
Operator Sound Level (ISO 6396)
71 dB(A)
71 dB(A)
Machine Sound Level (ISO 6395)
111 dB(A)
111 dB(A)
Sound Performance - Suppression
Machine Sound Level (ISO 6395)
109 dB(A)
109 dB(A)
Operator Sound Level (ISO 6396)
70 dB(A)
70 dB(A)
Hydraulic System - Lift/Tilt
Cylinders, Double Acting - Tilt, Bore and Stroke
267 mm × 685 mm (10.5 in × 27.0 in)
Cylinders, Double Acting - Lift, Bore and Stroke
210 mm × 1050 mm (8.3 in × 41.3 in)
Lift/Tilt System
Variable displacement piston
Maximum Flow
13.7 gal/min
52 l/min
Maximum Flow at 1,400-1,860 rpm
153 gal/min
580 l/min
Pilot System
Variable displacement piston
Relief Valve Setting
551 psi
3800 kPa
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt
4757 psi
32800 kPa
Brakes
Brakes
SAE J1473 OCT90, ISO 3450:1992