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988K Millyard Arrangement

988K Millyard Arrangement

At a Glance

Net Power
541 HP
Operating Weight
139920 lb
Engine Model
Cat® C18 ™
Net Power - SAE J1349
541 HP
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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. The 988K Millyard Arrangement is designed to meet the demands of millyard applications. The features of the 988K Millyard work together to provide a durable and reliable machine to meet the needs of the modern millyard.


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Net Power 541HP
Engine Model Cat® C18 ™
Net Power - SAE J1349 541HP
Bore 5.7in
Stroke 7.2in
Displacement 1105in³
Torque Rise 58%
Rated Speed 1700/min
Gross - ISO 14396 580HP
Peak Power Speed 1500/min
Peak Power Speed - 1,500 rpm - Gross - ISO 14396 580HP
Peak Power Speed - 1,500 rpm - Gross - SAE J1995 588HP
Peak Power Speed - 1,500 rpm - Net Power - SAE J1349 541HP
Peak Torque - 1,200 rpm 2104lb/ft
Emissions U.S. EPA Tier 4 Final/EU Stage V Technology or Tier 2 Equivalent

Operating Specifications

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Operating Weight 139920lb
Tipping Load - Articulated 37° 68005lb
Tipping Load - Straight 78115lb


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


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Front Fixed
Rear Trunnion
Oscillation Angle 13°

Hydraulic System - Steering

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Steering System - Circuit Pilot, load sensing
Steering System - Pump Piston, variable displacement
Relief Valve Setting - Steering 4351psi
Maximum Flow 71.3gal/min
Steering Cycle Times - High Idle 3.4s
Steering Cycle Times - Low Idle 5.6s
Total Steering Angle 74°

Service Refill Capacities

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Fuel Tank 188gal (US)
Cooling System 31.7gal (US)
Crankcase 15.9gal (US)
Transmission 31.7gal (US)
Differential - Final Drives - Front 49.1gal (US)
Differential - Final Drives - Rear 49.1gal (US)
Hydraulic System - Tank Only 63.4gal (US)
Hydraulic System Factory Fill 125.5gal (US)
Diesel Exhaust Fluid Tank 8.7gal (US)

Dimensions - Millyard Linkage

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Dump Angle at Maximum Lift 39.4°
Fork Height at Maximum Lift 15.3ft
Fork Height with Level Arms 8.1ft
Fork Top Clamp Opening 12.3ft
Front Axle Centerline to Fork Tip 15.6ft
Ground to Bumper Clearance 3.1ft
Ground to Center of Front Axle 3.2ft
Ground to Lower Hitch Clearance 1.9ft
Ground to Top of Exhaust Stacks 13.8ft
Ground to Top of Hood 10.9ft
Ground to Top of ROPS 13.8ft
Hinge Pin Height at Maximum Lift 16.1ft
Maximum Overall Length 41ft
Rear Axle - Centerline to Bumper 10.5ft
Wheel Base 14.9ft

Hydraulic System - Lift/Tilt

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Lift/Tilt System Variable displacement piston
Maximum Flow 13.7gal/min
Relief Valve Setting - Main 580psi
Cylinders, Double Acting - Lift, Bore and Stroke 235 mm × 976 mm (9.25 in × 38.4 in)
Cylinders, Double Acting - Tilt, Bore and Stroke 292 mm × 671 mm (11.5 in × 26.4 in)
Maximum Flow at 1,400-1,860 rpm 153gal/min
Pilot System Variable displacement piston
Lift/Tilt System - Circuit EH- Positive Flow Control, Flow Sharing
Relief Valve Setting - Lift/Tilt 4641psi


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Fork End Area 69ft²

Sound Performance - Standard

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

Sound Performance - Suppression

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Machine Sound Level (ISO 6395) 109dB(A)
Operator Sound Level (ISO 6396) 70dB(A)


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Brakes SAE J1473 OKT90, ISO 3450:1992