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Power HD

Power HD TR-4 Micro Waterproof 2.2kg Metal Geared Servo for TRX-4

Part no. TR-4

3+ in stock5.0
5 reviews
1 / 4
1 / 4

$34.99

or 4 fortnightly payments of $8.75 with afterpay or PayPal, or zip

Will it fit?

Check fit: add your vehicle to My GarageFits 30 vehicles

Overview

Please Note

Servos are powered by the ESC's output to the receiver. If you're using a higher-strength servo than the ESC can support (usually greater than 20kg), you may experience 'brown-outs' where the radio signal can be interrupted and cause erratic driving. This can be helped by plugging a Glitch Buster into the receiver smoothing the current delivery. However, in some cases, you may need to install an external BEC.

New from Power HD — the TR-4! With compatibility for high voltage 6V–8.4V, at 7.4V input the servo pulls up to 2.6kg-cm of torque at a speed of down to 0.10s. A long 35cm receiver wire and mini size of 22.5 x 12.5 x 24.0mm ensures the servo is a direct fit in the Traxxas TRX-4 Crawler Range! The TR-4 servo comes with a 25T metal spline and special gaskets making it waterproof for go-everywhere capabilities.

Note

Servos are powered by the ESC's output to the receiver. If you're using a higher-strength servo than the ESC can support (usually greater than 20kg), you may experience brown-outs where the radio signal can be interrupted and cause erratic driving. This can be helped by plugging a Glitch Buster into the receiver to smooth the current delivery. However, in some cases, you may need to install an external BEC.

Specifications

Torque (4.8V)1.8 kg-cm (25.0 oz/in)
Torque (6.0V)2.2 kg-cm (30.6 oz/in)
Torque (7.4V)2.6 kg-cm (36.1 oz/in)
Speed0.15 sec (4.8V) | 0.12 sec (6.0V) | 0.10 sec (7.4V)
Operating Voltage4.8–7.4 DC Volts
Weight16.0 g (0.56 oz)
Gear TypeCopper & Aluminium
Operating Temperature-20°C–60°C
Working Frequency1520µs / 50Hz
Size22.5 x 12.5 x 24.0mm (0.89 x 0.49 x 0.94 in)
SpecificationPower HD TR-4 Servo Dimensions:
Total Height (A)29mm
Body Width (B)22.8mm
Below Mount (C)15.5mm
Above Mount (D)11.5mm
Total Length (E)29.7mm
Total Width (F)12.8mm

Servo

Servo
SizeConventionally sized servo namesSub Micro
Gear MaterialMetal
Servo Spline Count25Tooth
Waterproof CasingYes
Case MaterialPlastic
Height (A)29mm
Body Length (B)22.8mm
Bottom to Under Mount (C)15.5mm
Top to Under Mount (D)11.5mm
Length (E)29.7mm
Width (F)12.8mm
Rotational Degrees120° (Normal)
6V Torque kg/cmKilograms of torque at 25mm away from the center of the spline2.2
6V Sec/60 DegreesSeconds per 60 degrees of rotation0.12

Compatibility

Reviews (5)

5.0

Based on 5 reviews

  • 5 stars5
  • 4 stars0
  • 3 stars0
  • 2 stars0
  • 1 star0

  • steve B

    Verified buyer

    19 Apr 2026

    good

  • Brendon S

    Verified buyer

    23 Feb 2025

    Standard steering servo on my son's Traxxas trx4m bronco died within 4 days of carpet crawling, so new servo with metal gear set was ordered with hobbies direct and within 4 days we had it at our door. Came with new horns in great packaging and even better, (and not very common) is the servo wires were longer then standard making the job so much easier, plug and play and we were away. Thanks again hobbies direct. Great products at the best prices and service second to none.

  • 3 ratings without a written review5 stars: 3

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