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Caterpillar D5 SA Special Application vs Caterpillar RD8

Verdict: Caterpillar D5 SA Special Application vs Caterpillar RD8

The Caterpillar D5 SA Special Application and the Caterpillar RD8 are both tractors — here is how they stack up on the figures that matter. Caterpillar RD8 leads on rated power with 104 hp against 90 hp. Caterpillar D5 SA Special Application is the lighter machine (9,253 kg vs 15,195 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. Caterpillar D5 SA Special Application is the newer design (1967 vs 1935). In short: choose the Caterpillar RD8 for outright pulling power, or the Caterpillar D5 SA Special Application if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Fit & specs
Caterpillar D5 SA Special Application Tractor
Caterpillar
85
Fit score
Best match
Clear
Caterpillar RD8 Tractor
Caterpillar
85
Fit score
Best match
Clear
Rated power
90 hp
104 hp
Confidence
40%
40%
Guide price
Overview
Manufacturer
CaterpillarReference
CaterpillarReference
liquid-cooled inlineReference
Diesel 6-speed crawlerMay 19 - 25, 1936Link: Nebraska Tractor Test 257 fileReference
Drive
crawlerReference
crawlerReference
Engine
Drawbar (claimed)
67.1 kWReference
Displacement
8.6 LReference
20.4 LReference
Bore/Stroke
114 x 140 mmReference
146 x 203 mmReference
Rated RPM
1900Reference
1000Reference
Starter
electricReference
Starter volts
24Reference
Oil capacity
46.4 LReference
Coolant capacity
41.6 LReference
Drawbar (tested)
77.5 kWReference
Belt (tested)
88.2 kWReference
Belt power (max)
88.2 kWReference
Max power
77.5 kWReference
Transmission
Gears
5 forward and 3 reverseReference
6 forward and 2 reverseReference
Clutch
dry discReference
Capacities
Fuel
295.2 LReference
PTO & Hydraulics
Hydraulic system
43.5 LReference
Type
gearReference
gearReference
Capacity
43.5 LReference
Pressure
137.9 barReference
Pump flow
87.1 lpmReference
Dimensions
Weight
9253 kgReference
15195 kgReference
Length
388 cmReference
Height (steering wheel)
208 cmReference
Height (exhaust)
264 cmReference
Shipping weight
9253 kgReference
Gauge
187 cmReference
198 cmReference
Electrical
Charging system
alternatorReference
Charging amps
50Reference
Battery volts
12Reference
Caterpillar D5 SA Tracks
Width
237 cmReference
50 cmReference
Length on ground
217 cmReference
Area on ground
2.0 m²Reference
RD8 Serial Numbers
1935
1H1Reference
1936
1H247Reference
1937
1H1497Reference
Caterpillar RD8 Tracks
Test results
Belt fuel use (max)
32.6 l/hourReference
Max pull
8979 kgReference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.

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