Rowan Astronomy Sky-Watcher HEQ5 Pro & Orion Sirius EQ-G Belt Mod Kit

Rowan Astronomy Sky-Watcher HEQ5 Pro & Orion Sirius EQ-G Belt Mod Kit

  (10 Reviews)
✓ 2 year warranty


13x in stock shipped 1-2 working days

About this product

Model:  rowan_heq5_belt_mod_kit
Part Number:  10000012a

This kit replaces the HEQ5 Pro's spur gear drive train with timing belts. 

Reduces spur gear errors, which reduces tracking errors.

Slewing is much quieter - the 'grinding' noise that regular spur gears produce is significantly reduced. 

The pulley ratio is the same as the factory gears so Sky Watcher SynScan hand controller functions are unaffected. All gain and no loss :-) 

HEQ5 Belt Kit comprises of: 

2 x 47 tooth pulleys. 2 x 9 tooth pulleys. 
2 x timing belts. 
2 x intermediate rollers. 2 x 5mm mounting shafts. 
1x 8mm white acrylic cover spacer + 6 stainless fixings. 

Rowan HEQ5 Belt Kit Fitting Instructions

An optional extractor tool is available to easily remove the pinion gear from the motor. 

Please note: Some older HEQ5 Pro mounts (around 5+ years) are not compatible with the Rowan Upgrade kit. 

Customer reviews

Average Rating (10 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Order and receiving items
Tuesday, 23 March 2021  | 

Once again, super quick delivery and quality products. The belt mod especially is a quality product that has really improved the mount accuracy. Very happy

Rating (max 5):  
Fantastic service from FLO
Monday, 15 March 2021  | 

I have not long fitted the belt mod to my HEQ5 Pro and tested it on an imaging session over the weekend.

Prior to fitting the belt mod I was achieving circa 1.3" RMS error however the other night I was averaging around 0.8" - baring in mind that there was a 'breeze' in the air I thought that was a huge improvement.

Thanks to FLO for the well packaged, quickly sent item. A fantastic service as always!

Rating (max 5):  
Sky-Watcher heq5 pro belt mod
Thursday, 8 October 2020  | 

Good quality, easily fitted with included instructions. Flo delivered promptly. Just need the clouds to go away so I can see if it improved the sky watcher mount. I have high hopes as when I stripped the original gears away from the Mount I could visually see the backlash in the gears as I rocked them back and forward.

Rating (max 5):  
Easy and effective
Tuesday, 25 August 2020  | 

The the pinion extractor is an essential, but if you follow the instructions and are methodical then itís pretty straight forward. One of the instructions is to set a pulley 5.5mm away from the body so you may struggle without a digital vernier calliper but itís easy enough if you do have one.

Rating (max 5):  
Awesome improvement for Sirius EQ-G
Wednesday, 2 October 2019  | 

The belt kit from Rowan astronomy came well packaged and labeled!

The instructions were clear and thorough with detailed pictures to clarify the text.

The mount is much much quieter. The sound with the old gear train (before the timing belt upgrade) was annoying.

The 4mm gear extractor made easy work of removing the small drive gear from each motor.

I have only recently performed this upgrade and have not had much time at this scope since. But everything I
have read on the Rowan upgrade has been positive. I expect the same.

By the way, Martin at FLO was quick to answer some questions and they also had the best price.

Rating (max 5):  
A must for Astrophotography
Tuesday, 2 July 2019  | 

Very easy to install, manual is easy to follow plus there are tons of videos out there.
The slew is more quiet now, PHD tracking is way better - it's like a different mount
The Pinion Extractor should be included in this kit.

Rating (max 5):  
Belt Mod.
Friday, 14 June 2019  | 

I fitted the belt mod today. Now I need the clouds and the moon to disappear. However it sounds quiet and I'm hoping my RA will smooth out a bit.

Rating (max 5):  
Rowan belt mod for HEQ5
Wednesday, 6 March 2019  | 

THis is a fantastic update! Very simple and functional design, very easy to mount it. The result is much less noise, and seems much smoother operation. I did not test this under the sky yet, but I feel this will also positive efect for guiding /backlash. I recommend this update for all who use HEQ5 and EQ6 mount!


Rating (max 5):  
Guiding greatly improved
Monday, 18 February 2019  | 

My guiding was getting steadily worse, rarely below 2 rms. after this easy upgrade Iím guiding at .6 on average.

Rating (max 5):  
Much improved backlash
Wednesday, 21 November 2018  | 

Really pleased with the belt mod. The backlash which had started to creep into the dec axis of my HEQ5 has improved greatly as a result of fitting the belt system so that is now less than 25% of what it as (the residual backlash may well be in the worm gears rather than the motor gears which the belt mod can't fix). Guiding has become much better as measured using pHD2. One of the rollers - the replacement for the dec idler gear was a bit tricky to fit and a rubber mallet was needed to drive it home. Overall, the entire belt kit took about an hour and a half to fit and adjust. The instructions were excellent - clear and easy to follow and the kit was thoughtfully packaged with the dec and ra axis kits in separate labelled bags. The pinion extractor did the job without fuss and I would say it is a must to buy alongside the main kit.


Please fill in the form below to ask a question.


Q1. Do you have advice for tensioning the belts?

As a guide, when fitted you should just be able to twist the belt through 90 degrees. If you can twist it more or less then the tension needs to be adjusted.

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