WhichTractor
  • Rigid chassis
  • WhichTractor size: Utility
  • No lab test on file
  • 1971–1976
  • 18,540 built

WhichTractor size, not the maker’s category

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

David Brown 990 (A) (also listed as 900 Synchromesh) specs: hp, weight, years

900 Synchromesh is the title our source lists this machine under · Source: Traktorenlexikon, “David Brown 900 Synchromesh”

DAVID BROWN AD 4/49 four-cylinder diesel. The manufacturer claimed 57.3 horsepower. No laboratory has tested one, so there is no measured figure at the shaft.

Engine power, claimed · gross or net not stated

57.3 hp

42.7 kW as stated by the source

No lab test on file

Claimed · standard not stated by the source

Source · Traktorenlexikon, “David Brown 900 Synchromesh”, 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
5,699 lb
3-point lift
4,251 lb
Top speed
15.5 mph

David Brown 990 (A) (also listed as 900 Synchromesh) specs: key facts

  • The David Brown 990 (A) (also listed as 900 Synchromesh) was built from 1971 to 1976.

  • The David Brown 990 (A) (also listed as 900 Synchromesh) has a claimed engine power (gross or net not stated) of 42.7 kW (57.3 hp); it has no measured PTO figure.

  • The David Brown 990 (A) (also listed as 900 Synchromesh) was offered in two-wheel-drive and four-wheel-drive versions.

  • The David Brown 990 (A) (also listed as 900 Synchromesh) has a DAVID BROWN AD 4/49 engine, a 4-cylinder 3.19 L diesel unit.

  • The David Brown 990 (A) (also listed as 900 Synchromesh) weighs 2,585 kg (5,699 lb) unladen.

  • The David Brown 990 (A) (also listed as 900 Synchromesh) has an independent rear PTO running at 540 rpm.

  • The three-point hitch of the David Brown 990 (A) (also listed as 900 Synchromesh) lifts 1,928 kg (4,251 lb) at the lower-link ends.

Source · Traktorenlexikon, “David Brown 900 Synchromesh”

Illustration of the 1971–1976 David Brown 990 (A), a 57 hp farm tractor, four-wheel-drive version, a drawing generated from its specification record
Illustration — not a photograph · four-wheel-drive version

How much horsepower does a 990 (A) (also listed as 900 Synchromesh) have?

The only figure for the 990 (A) (also listed as 900 Synchromesh) is 57.3 hp (42.7 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)
57.3 hp

Source · Traktorenlexikon, “David Brown 900 Synchromesh”

What engine is in a 990 (A) (also listed as 900 Synchromesh)?

A 990 (A) (also listed as 900 Synchromesh) has a DAVID BROWN AD 4/49, a 4-cylinder 3.19 L diesel engine.

Engine — 990 (A) (also listed as 900 Synchromesh) engine specifications
Make & modelDAVID BROWN AD 4/49
Cylinders4, liquid-cooled
Displacement194.9 ci · 3.19 L
Max torque152 lb·ft · 206 N·m @ 1,400 rpm
Electrical system12 V

Source · Traktorenlexikon, “David Brown 900 Synchromesh”

How much will a 990 (A) (also listed as 900 Synchromesh) lift?

A 990 (A) (also listed as 900 Synchromesh) lifts 4,251 lb (1,928 kg) at the lower-link ends.

Hydraulics & PTO — 990 (A) (also listed as 900 Synchromesh) hydraulics and PTO specifications
Lift at ends4,251 lb · 1,928 kg
Rear PTOIndependent, engine-driven, 540 rpm @ 1,828 engine rpm
PTO shaft1 3/8"- 6 splines

Source · Traktorenlexikon, “David Brown 900 Synchromesh”

What transmission does a 990 (A) (also listed as 900 Synchromesh) have?

Transmission specifications for the 990 (A) (also listed as 900 Synchromesh) are below.

Transmission — 990 (A) (also listed as 900 Synchromesh) transmission specifications
ClutchDry two-stage double clutch
Top speed15.5 mph · 25 km/h

Source · Traktorenlexikon, “David Brown 900 Synchromesh”

How much does a 990 (A) (also listed as 900 Synchromesh) weigh?

A 990 (A) (also listed as 900 Synchromesh) weighs 5,699 lb (2,585 kg) unladen.

Weights & dimensions — 990 (A) (also listed as 900 Synchromesh) weights and dimensions
Unladen weight5,699 lb · 2,585 kgtwo-wheel-drive version
Wheelbase82.0 in · 2,083 mm
Length130.0 in · 3,302 mm
Width67.0 in · 1,702 mm
Height99.0 in · 2,515 mm
Ground clearance20.9 in · 530 mmtwo-wheel-drive version
Front track52.0–72.0 in · 1,321–1,829 mmtwo-wheel-drive version
Rear track52.0–76.0 in · 1,321–1,930 mm
Turning radius, braked10.8 ft · 3.28 m

Source · Traktorenlexikon, “David Brown 900 Synchromesh”

What oil does a 990 (A) (also listed as 900 Synchromesh) take, and how much?

A 990 (A) (also listed as 900 Synchromesh) engine takes 7.8 qt (7.39 L). Single source, not independently verified — always confirm against the operator’s manual for your machine.

990 (A) (also listed as 900 Synchromesh) fluid capacities, grades and service intervals
SystemCapacity
Engine oil7.8 qt · 7.39 LSource: Traktorenlexikon, “David Brown 900 Synchromesh” · single source, not independently verified
Transmission28.5 qt · 27.0 LSource: Traktorenlexikon, “David Brown 900 Synchromesh” · single source, not independently verified
Final drives2.4 qt · 2.27 LSource: Traktorenlexikon, “David Brown 900 Synchromesh” · single source, not independently verified
Cooling system14.4 qt · 13.6 LSource: Traktorenlexikon, “David Brown 900 Synchromesh” · single source, not independently verified

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

Which tractors compare with a 990 (A) (also listed as 900 Synchromesh)?

Within 10% of its 46.8 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 David Brown 990 (A) (also listed as 900 Synchromesh)

Is a 990 (A) (also listed as 900 Synchromesh) two-wheel drive or four-wheel drive?

The David Brown 990 (A) (also listed as 900 Synchromesh) was offered in two-wheel-drive and four-wheel-drive versions.

What PTO does a 990 (A) (also listed as 900 Synchromesh) have?

A 990 (A) (also listed as 900 Synchromesh) has a independent 540 rpm rear PTO on a 1 3/8"- 6 splines shaft.

What serial numbers does a 990 (A) (also listed as 900 Synchromesh) carry?

The source prints serial numbers 850001 to 868541 for the type 990/1. It does not say whether that is the tractor’s or the engine’s number, and we never work out a year from a serial number.

Sources and how this page was built

Compiled from Traktorenlexikon, “David Brown 900 Synchromesh”.

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: David Brown 900 Synchromesh — CC BY-SA 4.0, WIKIBOOKS-TL-115991 · revision 990952. Wikibooks contributors (Traktorenlexikon). Original document