Week 5 (5/2-5/6) Hydraulic Steering

We have a piece of equipment with hydraulic steering. The operators are complaining that there is a delay in the steering followed by a suddenly turning sharply. After pulling it into the shop we found that there was indeed a delay in the steering but not sharp grab. We attached our pressure gauge and found the system to be operating within manufactures specs for pressure. The filters have been changed recently and the system is not contaminated as far as my co worker and I can see. Would this delay be due to the directional valve in the steering wearing out over time? The equipment is almost 30 years old.

Hours: 40

Running Total: 192