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988K Wheel Loader

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 - Specifications

Engine
Net Power
541 HP
403 kW
Engine Model
Cat® C18 ACERT™
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
Peak Torque - 1,200 rpm
2104 lb/ft
2852 N·m
Net Power - SAE J1349
541 HP
403 kW
Peak Power Speed
1,500 rpm
Peak Power Speed - 1,500 rpm - Gross - ISO 14396
580 HP
432 kW
Gross - ISO 14396
580 HP
432 kW
Peak Power Speed - 1,500 rpm - Gross - SAE J1995
588 HP
439 kW
Emissions
U.S. EPA Tier 4 Final/EU Stage IV OR Tier 3/Stage IIIA Equivalent OR Tier 2/Stage II Equivalent
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349
541 HP
403 kW
Operating Specifications
Operating Weight
112574 lb
51062 kg
Bucket Capacity Range
4.7-13 m3 (6.2-17 yd3)
Rated Payload - Quarry Face
12.5 t
11.3 t
Cat Truck Match - High Lift
773-775
Rated Payload - Loose Material
16 t
14.5 t
Cat Truck Match - Standard
770-772
Buckets
Bucket Capacities
4.7-13 m3 (6.2-17 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 - Reverse 2
8.9 mile/h
14.3 km/h
Direct Drive - Reverse 3
15.8 mile/h
25.5 km/h
Direct Drive - Forward 2
7.8 mile/h
12.5 km/h
Direct Drive - Reverse 1
5 mile/h
8 km/h
Direct Drive - Forward 1
Lock-up disabled
Direct Drive - Forward 3
13.9 mile/h
22.3 km/h
Direct Drive - Forward 4
24.4 mile/h
39.3 km/h
Axles
Front
Fixed
Rear
Trunnion
Oscillation Angle
13°
Service Refill Capacities
Fuel Tank
188 gal (US)
712 l
Cooling System
31.7 gal (US)
120 l
Crankcase
15.9 gal (US)
60 l
Transmission
31.7 gal (US)
120 l
Hydraulic System - Tank Only
63.4 gal (US)
240 l
Coolant (Validated by Test Cell Fill Quantities)
33 gal (US)
125 l
Transmission - Validated by Test Cell Fill Quantities
29 gal (US)
110 l
Differential - Final Drives - Front
49.1 gal (US)
186 l
Diesel Exhaust Fluid Tank (For Tier 4 Final/Stage IV Only)
8.7 gal (US)
33 l
Hydraulic System Factory Fill
125.5 gal (US)
475 l
Differential - Final Drives - Rear
49.1 gal (US)
186 l
Hydraulic System - Steering
Maximum Flow
71.3 gal/min
270 l/min
Steering System - Pump
Piston, variable displacement
Total Steering Angle
86°
Relief Valve Setting - Steering
4351 psi
30000 kPa
Steering Cycle Times - High Idle
3.4 s
3.4 s
Steering Cycle Times - Low Idle
5.6 s
5.6 s
Steering System - Circuit
Pilot, load sensing
Sound Performance - Tier 4 Final/Stage IV - Standard
Machine Sound Level (ISO 6395)
111 dB(A)
111 dB(A)
Operator Sound Level (ISO 6396)
72 dB(A)
72 dB(A)
Sound Performance - Tier 4 Final/Stage IV: Suppression
Machine Sound Level (ISO 6395)
109 dB(A)
109 dB(A)
Operator Sound Level (ISO 6396)
72 dB(A)
72 dB(A)
Hydraulic Cycle Time (1,400-1,860 rpm)
Total Hydraulic Cycle Time - Empty Bucket
18.2 s
18.2 s
Lower Float Down
3.5 s
3.5 s
Rack Back
4.5 s
4.5 s
Raise
8 s
8 s
Dump
2.2 s
2.2 s
Sound Performance - Tier 2 Equivalent/Stage II: Suppression
Machine Sound Level (ISO 6395)
110 dB(A)
110 dB(A)
Operator Sound Level (ISO 6396)
72 dB(A)
72 dB(A)
Sound Performance - Tier 2 Equivalent/Stage II: Standard
Machine Sound Level (ISO 6395)
112 dB(A)
112 dB(A)
Operator Sound Level ( ISO 6396)
73 dB(A)
73 dB(A)
Hydraulic System - Lift/Tilt
Relief Valve Setting
551 psi
3800 kPa
Lift/Tilt System - Circuit
EH- Positive Flow Control, Flow Sharing
Maximum Flow
13.7 gal/min
52 l/min
Maximum Flow at 1,400-1,860 rpm
153 gal/min
580 l/min
Lift/Tilt System
Variable displacement piston
Cylinders, Double Acting - Tilt, Bore and Stroke
269 mm × 685 mm (8.7 in × 27 in)
Relief Valve Setting - Lift/Tilt
4757 psi
32800 kPa
Pilot System
Variable displacement piston
Cylinders, Double Acting - Lift, Bore and Stroke
210 mm × 1050 mm (8.7 in × 41.3 in)
Brakes
Brakes
SAE J1473 OCT90, ISO 3450:1992