WhichTractor
  • Rigid chassis
  • WhichTractor size: Standard-size
  • No lab test on file
  • 1969–1975
  • 367 built

WhichTractor size, not the maker’s category

Derived by WhichTractor from a sourced three-point linkage. How we decide what a machine is

Bührer RP-21 Super (A) specs: hp, weight, years

Perkins A 4.248 four-cylinder diesel. The manufacturer claimed 71 horsepower. No laboratory has tested one, so there is no measured figure at the shaft.

Engine power, claimed · gross or net not stated

71 hp

53 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “Bührer RP 21 Super (A)”, claimed

This is the maker’s own figure, measured at the engine. Power at the PTO is lower — by how much, for this machine, nobody has measured.

Weight
5,807 lb
3-point lift
4,850 lb
Hyd. flow
5.2 gpm
Top speed
15.5 mph

Bührer RP-21 Super (A) specs: key facts

  • The Bührer RP-21 Super (A) was built from 1969 to 1975.

  • The Bührer RP-21 Super (A) has a claimed engine power (gross or net not stated) of 53 kW (71 hp); it has no measured PTO figure.

  • The Bührer RP-21 Super (A) was offered in two-wheel-drive and four-wheel-drive versions.

  • The Bührer RP-21 Super (A) has a Perkins A 4.248 engine, a 4-cylinder 4.07 L diesel unit.Source 2

  • The Bührer RP-21 Super (A) weighs 2,634 kg (5,807 lb) unladen.

  • The Bührer RP-21 Super (A) has an independent rear PTO running at 540 rpm.

  • The three-point hitch of the Bührer RP-21 Super (A) lifts 2,200 kg (4,850 lb) at the lower-link ends.

  • The hydraulic pump of the Bührer RP-21 Super (A) delivers 19.5 L/min (5.2 gpm).

Source · Traktorenlexikon, “Bührer RP 21 Super (A)”

How does the RP-21 Super (A) compare with its class?

  • Limitation:

    A hydraulic pump flow of 19.5 L/min is low for its class — 51% below the median of 40 L/min across the 329 machines within 10% of its power that hold this figure.

Derived by WhichTractor from 400 comparable records. How we work this out

Illustration of the 1969–1975 Bührer RP-21 Super (A), a 71 hp farm tractor, four-wheel-drive version · cab was optional — shown without it · colour not recorded — shown unpainted, a drawing generated from its specification record
Illustration — not a photograph · four-wheel-drive version · cab was optional — shown without it · colour not recorded — shown unpainted

How much horsepower does a RP-21 Super (A) have?

The only figure for the RP-21 Super (A) is 71 hp (53 kW) of claimed engine power, gross or net not stated, no test standard stated — not power at the shaft.

Engine, claimed (gross/net not stated)
71 hp

Source · Traktorenlexikon, “Bührer RP 21 Super (A)”

What engine is in a RP-21 Super (A)?

A RP-21 Super (A) has a Perkins A 4.248, a 4-cylinder 4.07 L diesel engine.

Engine — RP-21 Super (A) engine specifications
Make & modelPerkins A 4.248Source 2
Cylinders4, liquid-cooledSource 2
Displacement248.2 ci · 4.07 LSource 2
Max torque212 lb·ft · 287 N·m @ 1,300 rpm
Electrical system12 V

Source · Traktorenlexikon, “Bührer RP 21 Super (A)”

How much will a RP-21 Super (A) lift, and what is its hydraulic flow?

A RP-21 Super (A) lifts 4,850 lb (2,200 kg) at the lower-link ends.

Hydraulics & PTO — RP-21 Super (A) hydraulics and PTO specifications
Pump flow5.2 gpm · 19.5 L/min
Pressure2,845 psi · 196 bar
Lift at ends4,850 lb · 2,200 kg
Rear PTOIndependent, engine-driven, 540 rpm @ 1,900 engine rpmEngages under loadGround-speed PTO available
PTO shaft1 3/8"- 6 splines

Source · Traktorenlexikon, “Bührer RP 21 Super (A)”

What transmission does a RP-21 Super (A) have?

Transmission specifications for the RP-21 Super (A) are below.

Transmission — RP-21 Super (A) transmission specifications
Brakespedal-operated internal expanding shoe brake acting on the pinion shaft
Steeringmechanically operated spindle steering
Top speed15.5 mph · 25 km/h

Source · Traktorenlexikon, “Bührer RP 21 Super (A)”

How much does a RP-21 Super (A) weigh?

A RP-21 Super (A) weighs 5,807 lb (2,634 kg) unladen.

Weights & dimensions — RP-21 Super (A) weights and dimensions
Unladen weight5,807 lb · 2,634 kgtwo-wheel-drive version
Wheelbase84.5 in · 2,147 mmtwo-wheel-drive version
Length132.3 in · 3,360 mm
Width72.8 in · 1,850 mm
Height67.7 in · 1,720 mm
Ground clearance16.1 in · 410 mm
Front track61.4–64.3 in · 1,560–1,633 mmtwo-wheel-drive version
Rear track59.1 in · 1,500 mm
Turning radius, braked10.6 ft · 3.23 m

Source · Traktorenlexikon, “Bührer RP 21 Super (A)”

What oil does a RP-21 Super (A) take, and how much?

A RP-21 Super (A) engine takes 9.5 qt (9.0 L). Single source, not independently verified — always confirm against the operator’s manual for your machine.

RP-21 Super (A) fluid capacities, grades and service intervals
SystemCapacity
Engine oil9.5 qt · 9.0 LSource: Traktorenlexikon, “Bührer RP 21 Super (A)” · single source, not independently verified
Hydraulic11.6 qt · 11 LSource: Traktorenlexikon, “Bührer RP 21 Super (A)” · single source, not independently verified

Always confirm against the operator’s manual for your machine before service.

Which tractors compare with a RP-21 Super (A)?

Within 10% of its 63.3 hp at the PTO as the maker claimed it, with no laboratory test on file, the same type, and first built within 15 years of it.

Common questions about the Bührer RP-21 Super (A)

Is a RP-21 Super (A) two-wheel drive or four-wheel drive?

The Bührer RP-21 Super (A) was offered in two-wheel-drive and four-wheel-drive versions.

What PTO does a RP-21 Super (A) have?

A RP-21 Super (A) has a independent 540 rpm rear PTO on a 1 3/8"- 6 splines shaft.

Sources and how this page was built

Compiled from Traktorenlexikon, “Bührer RP 21 Super (A)”; and Traktorenlexikon, “Massey Ferguson MF 178”.

Sources checked

14 SEP 2026

Spotted an error?

Sources

Facts taken from these documents, units converted. Numbers beside a figure refer to this list. Licences and attribution

  1. Traktorenlexikon: Bührer RP 21 Super (A) — CC BY-SA 4.0, WIKIBOOKS-TL-119785 · revision 1042467. Wikibooks contributors (Traktorenlexikon). Original document
  2. Traktorenlexikon: Massey Ferguson MF 178 — CC BY-SA 4.0, WIKIBOOKS-TL-76619 · revision 1069046. Wikibooks contributors (Traktorenlexikon). Original document