Caterpillar 988K Wheel Loader

Axles

Front Fixed
Rear Trunnion

Brakes

Brakes SAE J1473 OCT90, ISO 3450:1992

Engine

Bore 6 in (14 cm)
Displacement 1,105 cu in (18,108 cu cm)
Engine Model Cat C18 ACERT
Gross – ISO 14396 580 hp (433 kw)
Make Cat
Model C18 ACERT
Net Power 541 hp (403 kw)
Net Power – SAE J1349 541 hp (403 kw)
Peak Power Speed – 1,500 rpm – Gross – ISO 14396 580 hp (433 kw)
Peak Power Speed – 1,500 rpm – Gross – SAE J1995 588 hp (438 kw)
Peak Power Speed – 1,500 rpm – Net Power – SAE J1349 541 hp (403 kw)
Peak Torque – 1,200 rpm 2,104 lbs ft (2,853 nm)
Rated Speed 1700 rpm
Stroke 7 in (18 cm)
Torque Rise 58%

Hydraulic Cycle Times

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

Hydraulic System – Lift/Tilt

Lift/Tilt System Variable displacement piston
Maximum Flow at 1,400-1,860 rpm 153 gpm (579 lpm)
Pilot System Variable displacement piston

Hydraulic System – Steering

Steering Cycle Times – High Idle 3.4 seconds
Steering Cycle Times – Low Idle 5.6 seconds
Steering System – Circuit Pilot, load sensing
Steering System – Pump Piston, variable displacement

Operating Specifications

Cat Truck Match – High Lift 773-775
Cat Truck Match – Standard 770-772
Rated Bucket Capacity 8-10 cu yd (6-8 cu m)
Rated Payload 27,558 lbs (12,500 kg)
Rated Payload – High Lift 27,558 lbs (12,500 kg)
Rated Payload – Standard 27,558 lbs (12,500 kg)
Tipping Load – Articulated 37 degrees 68,005 lbs (30,847 kg)
Tipping Load – Straight 78,115 lbs (35,432 kg)

Service Refill Capacities

Cooling System 32 gal (120 l)
Crankcase 16 gal (60 l)
Diesel Exhaust Fluid Tank 9 gal (33 l)
Differential – Final Drives – Front 49 gal (186 l)
Differential – Final Drives – Rear 49 gal (186 l)
Hydraulic System – Tank Only 63 gal (240 l)
Hydraulic System Factory Fill 126 gal (475 l)
Transmission 32 gal (120 l)

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)

Transmission

Direct Drive – Forward 1 Lock-up disabled
Transmission Type Cat planetary power shift
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