Usage:
- SUPPLEMENT: 06/25/79
SERVICE MAGAZINE, APRIL 16, 1979, PAGE 1. In the article, "Testing And Adjusting Procedures For 5P4210 Modular Cab Tilting Cylinder And Valve" a wrong part is shown in the chart and the Illustration. Change 3P1823 Adapter to read 308370 Reducing Bushing.
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All Machines Equipped With A Modular Cab
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The 5P4210 Tilting Cylinder is equipped with valves which prevent the weight of a modular cab from getting ahead of the cylinder travel and hydraulic pump operation as the cab is being raised or lowered. If the valves are not properly adjusted, the cab can drop suddenly after it passes over the center position. Anytime the valve is disassembled for cleaning or replacement of O-ring seals, the spools and poppets must be correctly adjusted so the cylinder and valve will operate correctly.
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Procedure To Test And Adjust The 5P4210 Modular Cab Tilting Cylinder And Valve:
Illustration 1. Correct location of Ports and Plugs.
Illustration 2. Correct usage of tools.
NOTE: See Illustrations 1 and 2 for the correct location of ports and plugs in the tilting cylinder and for the correct usage of the tools shown in the chart. It is possible that oil will flow from the cylinder during the testing and adjusting procedure. Put the cylinder in the bed of the cylinder repair stand or on a work bench. Make sure the cylinder rod is free to extend.
NOTE: Check the accuracy of the 5P4816 Gauge with the 5P8558 Pressure Gauge Calibrating Group before the testing and adjusting procedures are done. The cylinder rod can be extended or retracted with the pump hoses connected to ports "D" and "H".
No. 1-Retract Relief Valve Adjustment
Make sure the cylinder rod is retracted completely. Connect the pump hose with the gauge to Port "D". Connect the other hose to Port "H". With the cylinder rod completely retracted, operate the pump so pressure oil goes to Port "D". Check the pressure gauge indication. The indication on the gauge must be between 6000-6400 psi (41 500-44 250 kPa). If pressure is not within this range, release the pressure from the cylinder and remove Plug "G". Turn the Allen head screw that is behind Plug "G" in to increase the pressure and out to decrease the pressure. The setting (position) can be checked with the plug removed. Hold a towel over the open port when the pump is operated.
No. 2-Retract Hold Valve Adjustment
Make sure the cylinder rod is retracted completely. Use the 6V1389 Connector and 6V1390 Coupling to connect the hose with the gauge to Port "A". Connect the other hose to Port "D".
NOTE: One 4J7533 O-Ring must be used with the 6V1389 Fitting.
Operate the pump so pressure oil goes to Port "A". Check the pressure gauge indication. The indication on the gauge must be between 5400-5600 psi (37 250-38 690 kPa). To adjust the pressure, loosen the locknut and turn the screw in Valve "B" in to increase the pressure and out to decrease the pressure.
No. 3-Extend Relief Valve Adjustment
Make sure the cylinder rod is extended completely. Connect the pump hose with the gauge to Port "H". Connect the other hose to Port "D". With the cylinder rod fully extended, operate the pump so pressure oil goes to Port "H". Check the pressure gauge indication. The indication must be between 3800-4200 psi (26 180-28 880 kPa). If it is not in this range, release the pressure from the cylinder and remove Plug "C". Turn the Allen head screw that is behind Plug "C" in to increase the pressure and out to decrease the pressure. The setting can be checked with the plug removed. Hold a shop towel over the open port when the pump is operated.
No. 4-Extend Hold Valve Adjustment
Make sure the cylinder rod is completely extended. Use the 6V1389 Connector and the 6V1390 Coupling to connect the hose with the gauge to Port "E". Connect the other hose to Port "H". Operate the pump so pressure oil goes to Port "E". Check the pressure gauge indication. The indication on the gauge must be between 3000-3400 psi (20 700-23 450 kPa). To adjust the pressure setting, loosen the locknut and turn the screw in Valve "F" in to increase the pressure and out to decrease the pressure.