Generator Questions

Rich Biebel · 11-22-2013, 03:12 PM

The belt on most of those QD 7500's is the water pump drive belt. It has no adjustment. The sheet metal covers need to be removed and in motorhomes that often means the unit has to come out. Since there is no adjustment.....the water pump pulley must be removed to remove and replace the belt. The fit has to be reasonably tight so the right belt is important. The belts crack and if it is not changed could break and the unit will obviously overheat. I usually change the t-stat and temp sensor at the same time. Deposits build up on the sensor and they can cause poor cold starts and random shutdowns. The sensor signals the controller by way of an ohm reading what the coolant temp is and this controls the glow plug operation....If the unit is cold....the glow plugs are powered before cranking.If it is warm they do not energize.

11-22-2013, 03:12 PM	#26
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,320 Likes: 25 Liked 557 Times in 217 Posts	Re: Generator Questions and Answers, by R&J Control Inc The belt on most of those QD 7500's is the water pump drive belt. It has no adjustment. The sheet metal covers need to be removed and in motorhomes that often means the unit has to come out. Since there is no adjustment.....the water pump pulley must be removed to remove and replace the belt. The fit has to be reasonably tight so the right belt is important. The belts crack and if it is not changed could break and the unit will obviously overheat. I usually change the t-stat and temp sensor at the same time. Deposits build up on the sensor and they can cause poor cold starts and random shutdowns. The sensor signals the controller by way of an ohm reading what the coolant temp is and this controls the glow plug operation....If the unit is cold....the glow plugs are powered before cranking.If it is warm they do not energize. __________________ Rich Biebel S/C 1479 Stock 147R