10 General Information 20-4 Engine and Tractor Tune-up Model 2120 Tractor TM-4252 (Dec-70) TRACTOR TUNE-UP - Continued Service Specifications Reference HYDRAULIC SYSTEM Check stand-by pressure of hydraulic pump 156 to 160 kg/cm2 (2220 to 2280 psi) Section 70, group 5 Check rockshaft lift cycle time at 2500 rpm engine speed 1.8 sec. to 2.3 sec. Section 70, group 5 Check time required for extending or retracting remote cylinder at 2100 rpm engine speed 2 sec. Section 70, group 5 Check operating pressure of HIGH-LOW shift unit:
on tractors without independent power shaft 95-105 psi (6.7 to 7.3 kg/cm2) Section 50, group 10 on tractors with in¬ dependent power shaft 140-160 psi (9.8 to 11.2 kg/cm2) Section 50, group 10 Check operating pressure of power shaft clutch and brake 140 to 160 psi (9.8 to 11.2 kg/cm2) Section 50, group 35 TIRES Check tire inflation pressure Operator's manual TORQUES Check all accessible cap screws and nuts of tractor for proper torque Torque chart Printed in Germany