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

  (2 Reviews)
✓ 2 year warranty


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. 

Customer reviews

Average Rating (2 Reviews):  
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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.


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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.