The Windscreen Wiper Arm Adapter STC987 is a Land Rover splined drum adapter used between the wiper arm and wiper motor shaft on classic Land Rover models. This adapter allows the wiper arm to properly engage the splined drive shaft, ensuring reliable and consistent wiper operation.

Over time, the splines in the adapter or wiper arm can wear, causing the wiper arm to slip or stop moving while the motor continues to run. Replacing the adapter restores proper engagement between the wiper arm and shaft, helping maintain effective windshield wiping performance.

This  component installs directly between the wiper arm and shaft and is designed for vehicles equipped with dash-mounted negative-earth wiper motors.

Vehicle Fitment

Series

• Series IIA | 1967–1971 | Late IIA with negative earth dash-mounted wiper motor

• Series III | 1971–1985

Defender

• Defender 90

• Defender 90 NAS

• Defender 110

• Defender 110 NAS

• Defender 130

Supersession Part Numbers

No supersessions found.

FAQ

What does this adapter do?
It connects the wiper arm to the splined wiper motor shaft, ensuring proper drive engagement.

What symptoms indicate a worn adapter?
Common signs include wiper arms slipping, stopping mid-wipe, or failing to move while the motor runs.

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Part Number: STC987

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