# Gem Cart shutters when starting **URL:** \ **Category:** GEM Forum\ **Created:** [October 13, 2015, 8:35pm UTC](https://community.electricforum.com/t/gem-cart-shutters-when-starting/5436 "2015-10-13T20:35:39Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![jpeppenger](https://avatars.discourse-cdn.com/v4/letter/j/76d3ee/32.png) [@jpeppenger](https://community.electricforum.com/u/jpeppenger)\ **Post date:** [October 13, 2015, 8:35pm UTC](https://community.electricforum.com/t/gem-cart-shutters-when-starting/5436/1 "2015-10-13T20:35:39Z")
My gem shutters and jumps when starting, it has an upgraded motor, I think it is 7.5 volt. It also surges when cruising on the road at 30 mph or so. ---
**Author:** ![Old\_Houseboater](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/old_houseboater/32/544_2.png) [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)\ **Post date:** [October 13, 2015, 9:29pm UTC](https://community.electricforum.com/t/gem-cart-shutters-when-starting/5436/2 "2015-10-13T21:29:59Z")
If the programming hasn’t been modified check for stuck brushes and a damaged commutator. Ventilated motors get contaminated and brush holders get dirty which causes brushes to stick. This type of motor should have the brush assemblies serviced every 2 to 3 years. Dragging brakes are also a possibility. ---
**Author:** ![jpeppenger](https://avatars.discourse-cdn.com/v4/letter/j/76d3ee/32.png) [@jpeppenger](https://community.electricforum.com/u/jpeppenger)\ **Post date:** [October 18, 2015, 11:32am UTC](https://community.electricforum.com/t/gem-cart-shutters-when-starting/5436/3 "2015-10-18T11:32:54Z")
Took out the motor, it needed cleaning, completed the cleaning, still does the same thing, jumps, shudders, and has a hard time engaging when starting out, still surges at 30mph. After the initial start, it smooths out. I am looking at the half shafts or something in that area. Any ideas. ---
**Author:** ![Old\_Houseboater](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/old_houseboater/32/544_2.png) [@Old\_Houseboater](https://community.electricforum.com/u/Old_Houseboater)\ **Post date:** [October 18, 2015, 11:53am UTC](https://community.electricforum.com/t/gem-cart-shutters-when-starting/5436/4 "2015-10-18T11:53:20Z")
1 Does it still stutter when starting out? 2 If yes could still be a motor problem - check for open commutator segments 3 If no, could be programming problem - has any programming been done since the last time it was running properly? 4 Controller problem 5 if possible try another motor. This exact problem has happened to me a couple of months ago after a program change. I could not get it back, I swapped motors with my other cart and the problem went away. Both carts run perfectly. (5 hp motor T1 controller) ---
**Author:** ![jpeppenger](https://avatars.discourse-cdn.com/v4/letter/j/76d3ee/32.png) [@jpeppenger](https://community.electricforum.com/u/jpeppenger)\ **Post date:** [April 1, 2017, 2:39pm UTC](https://community.electricforum.com/t/gem-cart-shutters-when-starting/5436/5 "2017-04-01T14:39:05Z")
Thanks, it still has a little jerk at start but smooths out. Having worked on it lately. JP ---
**Author:** ![grantwest](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/grantwest/32/15_2.png) [@grantwest](https://community.electricforum.com/u/grantwest)\ **Post date:** [April 1, 2017, 3:43pm UTC](https://community.electricforum.com/t/gem-cart-shutters-when-starting/5436/6 "2017-04-01T15:43:27Z")
I had shuttering one time. It was programming issues. I had a setting turned up to high. And the other time it was a Stuck brush