Checking the Connecting Rod Bearings in a Gilson Testing Screen

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If your testing screen does not run smoothly or aggregates tend to migrate to one side of a screen tray during operation the Connecting Rod bearings could be worn. Gilson recommends replacing the whole connecting rod assembly to avoid fir and tolerance issue during installation.

To check your connecting rod bearings in your Testing Screen you first disconnect the machine from its power source.

Next, release the screen trays. Now remove the top and side covers and the pump handle grip to the machine and safely set them aside.

Note the short electrical wire to the electronic controller.
Rest the side cover aside as to not cause any stress on the electrical wire.

It’s important to examine the interior the unit while you have it opened. Check for leaked hydraulic fluid or excessively warned parts.

Next, clean the interior of the unit as to prevent foreign materials from failing into pump and contaminating the oil.

Now disconnect the hose from one of the hydraulic cylinders, leaving the other end of the hose connected to the pump. Place the free end of the hose into a clean container at a level that will allow gravity to empty the system of hydraulic oil. Pump the handle slowly to drain the hydraulic oil from the system.

Now, we are going to take the pump cover off the pump. Observe the hydraulic pump and the position of the pump cover. The bottom of the vent in the pump cover has a bevel that must face the front of the machine. Use a marker or other means to mark the front end of the cover to ensure correct orientation during reassembly later.
Remove the Pump Cover Assembly including cover, gasket and screws. Safely set the them aside to a clean area.

If there is sludge in the bottom of the pump reservoir, remove the pump from the machine and clean it out with solvent before refilling with oil.

Now rotate the drive pulley till the connecting rod is at its furthest down stroke.

Insert a wedging device between the separator crossmember and the top case, stabilizing the alignment between the connecting rod’s shoulder bolt and the separator.

Now remove the shoulder bolt.

Next, remove the Bearing Cap Screws and Lock Washers from the Connecting Rod Assembly, and then remove the Connecting Rod bearing Cap and set aside.

Now remove the Connecting Rod from the Main Shaft.
Examine the Connecting Rod including the Wrist Pin Sleeve by carefully pushing the sleeve out to the Connecting Rod.

Next, examine the Connecting Rod Bearing within the Connecting Rod.

For this demonstration we are not replacing the bearings, but if we were, we recommend replacing the whole connecting rod assembly to avoid fit and tolerance issues.

To continue, place the Connecting Rod onto the Main Shaft.

Return the shoulder bolt. Rotating the drive pulley as necessary, remove the wedging device.

Next, reattach hydraulic hoses.

Fill the pump reservoir with Hydraulic Fluid to within 1/4in from the top. Once you have confirmed the hydraulic oil is 1/4in from the top of the oil reservoir, reinstall the pump cover assembly in the same orientation as it was before is removal by aligning the two marks.

Pump up pressure on the hydraulic system with short strokes on the pump handle.

Now release the pressure by moving the handle all the way toward the front of the machine. Next, remove the pump cover and add more hydraulic oil, if necessary, to fill pump reservoir to within 1/4in of the top. Testing Screens with hydraulic clamping use a medium viscosity hydraulic oil such as Shell Tellus 25 or Mobil AW 32. Once you have confirmed the hydraulic oil is 1/4in from the top of the oil reservoir, reinstall the pump cover assembly.

Now we are going to bleed the air out of the hydraulic system.
Loosen the connections between the hoses and the cylinders by unscrewing the swivel connections slightly.

Pump up the hydraulic system just until oil appears at the loosened connections. Now retighten the swivel connections. Once tighten, pump the hydraulic system to confirm that all the fittings are free of leaks.

If the fittings leak, use hydraulic joint compound to create a seal between each leaky fitting and the pump or cylinder to which it is attached.

Now return the top and side covers, and pump handle grip.
After fully reassembling the unit with covers installed, run the unit empty for a few minutes. The Testing Screen should run freely and quietly.

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