Contributed by Robert Sheaf • Founder of CFC Industrial Training
In this month’s Troubleshooting Challenge, a truck assembly line has a lift system to elevate the transmission into position for bolting it to the engine. The operator complained to the maintenance department that the system was very sluggish to respond to the forward and reverse signals and the charge pressure dropped to 80 psi when it normally read 250 psi.
Maintenance checked the case drain and compared it to one taken nine months ago and found it to be close to the same flow. They also found when the unit was put into neutral, the case drain pressure jumped to 280 psi as it did in the past. Changing the charge pump with a new one did not fix the problem.
Can you identify what was the problem? We welcome responses of all kinds directly to Robert Sheaf at [email protected] or to [email protected]. The solution to the December 2023 Troubleshooting Challenge will be provided in conjunction with our February 2024 issue.
Filed Under: Components, Pumps & Motors, Trending, Troubleshooting
