If you are seeing incorrect timing when vehicles near the end of the wash the problem is most likely resulting from slippage in the conveyor drive motor. This can happen for several reasons, most commonly when belt is over a year old and nearing the end of its lifespan. OR small debris in the oil can wear channels inside the motor and cause more slippage. This may be a sign the motor needs to be replaced. If the motor is new or less than a year old, here are some things to check:
The #1 reason for slippage is due to the hydraulic oil. We highly recommend you do not use water based hydraulic oil. Water based oil in many times has been know to cut the life of your hydraulic equipment in half. It also can be responsible for causing slippage. If you have regular oil, check the weight of the oil and the quality of the oil. Cheap oil can break down faster under the intense pressure of a conveyor drive. Also some brands may say S32 on them but not actually be 32 weight oil. If your oil is not 32 weight, or has broken down, drain most of the oil and replace with a higher weight oil.
See if there is a cause behind any excessive drag on the conveyor drive, center, or take-up section and correct it. Check the pressure gauge in the power unit. If it is running 400 – 800 psi (lower when empty, higher when loaded with multiple vehicles) things are normal. If the pressure is spiking to 1200 psi when the conveyor is loaded, there is something wrong.
To eliminate the remote pulse kit variable, put the proximity sensor directly on the conveyor. There is a mounting hole in the motor bracket on the drive end for the prox sensor. There are holes in the sprocket to hold a prox target. You can fabricate a bracket for the prox sensor on the frame on the other side of the sprocket along with a prox sensor. Then the pulse detector is counting real, not virtual, pulses and if the conveyor bogs down, the prox sensor and the controller will detect it.
If it is defective, replace the motor. However, this is a rare occurrence. If the motor is slipping and the pressure is low, there is something wrong in the motor, but the motor is not necessarily defective. There may be construction debris in the hydraulic system that got caught in the motor. With the conveyor unloaded, reverse the conveyor by moving the lever in the power unit the complete opposite direction (Fwd. / Nuetral / Rev.) and run the motor backward just for two seconds to try to dislodge the debris and dump it into the tank where it can get filtered out. If this does not work, you may want to replace the motor, BUT, this is a last resort because as motors are expensive and difficult to replace. A warranty claim can be filed on the replaced motor, but if the motor is returned for warranty and there is nothing found wrong with it, the motor will be returned to the customer without refund.
*We suggest this maintenance be performed by an experience Tommy equipment technician. This is not a step by step guide but rather a quick informational overview.