UNIVERSAL JOINTS IN THE VEHICLE OR APPLICATION

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL LUBRICATION DON’T NEGLECT DRIVE SHAFT LUBRICATION! Lack of adequate or proper lubrication is among the most common causes of U-Joint and drive shaft failure! Proper servicing of the drive shaft is an essential part of vehicle maintenance and should not be overlooked in routine shop procedure. UNIVERSAL JOINTS IN THE VEHICLE OR APPLICATION To insure proper lubrication of all four bearing assemblies on universal joints, it is essential that mechanics add lubricant until it appears at all journal cross bearing seals (Fig. 10). This assures removal of dirt particles and other contaminants that may find their way into the bearings and indicates to the mechanic that the bearings are fully lubricated. Do not assume that bearing cavities have been filled with new lubricant unless flow is noticed around all four bearing seals! Journal cross seals are designed to relieve. However, if all the seals do not "pop" when being lubed, move the driveshaft laterally in all four directions and pull or push on the drive shaft in the direction opposite to the journal cross seal not relieving while lube gun pressure is being applied to the alemite fitting. An increase in line pressure may also be necessary. Fig. 10 1 Lube DRIVE SHAFT ASSEMBLY Factory assembled drive shafts are lubricated at the plant prior to shipment. However, ship-ping, handling and installation of the drive shaft assembly into the vehicle usually results in some loss of lube. Therefore, it is recommended that all universal joints be relubricated after installation of the drive shaft prior to putting vehicle in service. JOURNAL AND BEARING KITS Replacement universal joint kits contain only enough grease to provide needle bearing protection during storage. It is therefore necessary to completely lubricate each replacement kit prior to assembly into the drive shaft yokes. Each journal cross lube reservoir should be fully packed with a recommended grease and each bearing assembly should also be wiped with the same grease; filling all the cavities between the rollers and applying a liberal grease coating on the bottom of each race. After the kits are installed into the driveshaft yokes and prior to placing into service, they should be relubed, through the zerks, using the same grease. RECOMMENDED LUBRICANTS For center bearings, slip joints and universal joints use IH 251 HEP grease or equivalent NLGI #2 multi- purpose grease. RELUBE CYCLES Relubrication cycles for driveshaft universal joints and slip splines will vary with service requirements and operating conditions. Refer to Operator’s Manual. SLIP JOINT LUBRICATION Relube spline at intervals prescribed in Operator’s Manual. Apply grease gun pressure to lubrication zerk until lubricant appears at pressure relief hole in welch plug at sleeve yoke end of spline (Fig. 11). At this point, cover pressure relief hole with finger and continue to apply pressure until grease appears at sleeve yoke seal (Fig. 12). This will insure complete lubrication of spline. CTS-4017 - Page 10 PRINTED IN UNITED STATES OF AMERICA

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