Readers of this blog (I know there are millions of you) will recognise this golf trolley and I’m pleased to report that my first repair, the one to the motor, is still working perfectly. However, the owner of the trolley contacted me with a (funny) problem. Whilst recently enjoying a round of golf on the local fairway, the trolley decided to, by itself, begin to edge away from the second tee and then with some speed, head off in to the distance, without any operation of the dial switch, situated on the handle. Whilst this seemed funny at first, I remembered that the motor on this trolley had the kind of torque that, coupled to small gearbox and wheels on a heavy frame, could do some serious damage, left unchecked.
Original photo taken in Aug’17, below.
Unlike many modern electric golf trolleys, it doesn’t feature GPS guidance, remote control or amazingly, a dead-man’s switch, which seems like a major safety oversight to me. I’d have expected either a kill switch or dead-man’s switch* fitted to the handle on a trolley like this as the runaway scenario could never occur due to fail-safe nature of the switch being operated. With one, the trolley would only run when the operators’ hand was on the handle or cut out when the kill switch is activated, as with the saftety cord mechanism, on a jet ski for example. Perhaps the Mk2 Hillbilly Compact featured this.
*For example, a dead-man’s switch is usually fitted to something like an electric saw where the operator must old a handle-type switch to make it run. Once the operator lets go of the handle, the motor automatically fails-safe and cuts-out.
On with the repair. The trolley features some exposed connectors and cabling and it seemed sensible to check the continuity of the cables running up and down the handle shaft, as repeated trolley folding might have caused a problem with the wiring. Fortunately, the cabling was OK.
The owner had mentioned that the handle, where the speed control switch is located, had got wet in the past, which made my alarm bells ring.
Opening up the handle, which only required a basic tool kit, revealed evidence of water damage and corrosion to the speed control terminals. Luckily the owner of the trolley had stocked up on spare switches!
Removing the existing switch revealed intermittent continuity and varying amounts of resistance, which was not good. A fault most likely to have been caused by water ingress or excessive shock. The owner had supplied two ‘new old stock’ (NOS) switches. Which one to fit?
From time to time, it’s downright sensible to either fit NOS or second-parts as they’re usually cost-effective and are more likely to fit over pattern parts. But time can also affect apparently shiny parts. This was a case in point. I knew that the switch should vary resistance from open circuit to 10KOhms in either direction from COMM. The old one didn’t and one of the ‘new’ parts only went to 2KOhms, so was not in specification. Luckily, the remaining NOS switch worked fine and once refitted, and the handle reassembled, the golf trolley was ready to make the job of carrying clubs easier, once again.
Cost of replacement trolley: ££££ Cost of repair; £10 plus time. Moral of the story; don’t assume NOS parts will work. Test them first.