SUPPORT GP-ENGINE 1035502 - Caterpillar

Drift of Bowl Cylinders
Lift the cutting edge of the bowl 15 to 25 cm (6 to 10 in.) above the ground. Then move the control lever to the HOLD position and check the drift of the bowl cylinders. After three minutes, put a mark on the side of the bowl at the bottom of the draft arm. After five minutes, put a mark on the side of the bowl and measure the drift. Make this measurement 152.4 mm (6 in.) from the front of the bowl side with the oil at 38 to 49°C (100 to 120°F), drift for a new machine is not more than 8.0 mm (.31 in.)
Measuring Drift of Bowl CylindersIf drift is too much:1. Check the carry check valves.2. Check the piston seals in the bowl cylinders.Drift of Apron Cylinder
Check the drift of the apron cylinder with the bowl on the ground and the oil at 38 to 49°C (100 to 120°F). Lift the apron approximately 25 to 38 cm (10 to 15 in.) above the cutting edge of the bowl and move the control lever to the HOLD position. On the side of the apron at the front exposed area, mark a line using the bowl as a marking edge. After five minutes, mark another line and measure the drift. Drift for a new machine is not more than 32 mm (1.3 in.).
Measuring the Drift of Apron Cylinder (Typical Example)If the drift is too much:1. Check apron sequence valve.2. Check the piston seals in the apron cylinders.Speed Tests
Make all tests with oil at the normal temperature for operation and the tractor engine speed at high idle rpm. Use a stop watch to find the times.If the travel time is not correct:1. Check pump efficiency.2. Check the setting of the relief valve in the control valve.3. Check the operation of the valve spools in the control valve.4. Check the piston seals in the cylinders.Travel Time for Bowl Lift
Lower the scraper bowl to the ground and lift the apron. The time to lift bowl from ground to maximum height with bowl empty and apron lifted on a new machine is 3.0 .5 seconds.Travel Time for Apron Lift
Lower the scraper bowl to the ground and lower the apron. The time to lift apron from lowered to maximum height on a new machine is 3.0 .5 seconds.Travel Time for Ejector
Operate the ejector through several full EJECT and RETURN cycles then move the ejector to the rear of the scraper bowl.The time to move ejector from rear to forward position on a new machine is 7.0 .5 seconds.The time required to return ejector in the RETURN detent position is 5.0 .5 seconds.Relief Valve (Main)
Make reference to on first page of Scraper Hydraulic Testing and Adjusting section.
The relief valve is in the control valve for the scraper and is near the oil line connection from the pump.To check the pressure setting of the relief valve, use the 7S8714 Pressure Gauge (0 to 4000 psi), the