10 General Information 25-2 Separating Assemblies Model 2120 Tractor TM-4252 (Dec-70) Ifl I, 51531 Fig. 2 Disconnecting Hydraulic Lines Fig. 3 Attaching Points of Tractor Front End 1 Retainer 2 Cap screw 3 Return line to transmission case 4 Pipe clamps 5 Hydraulic pump inlet line 6 Hydraulic pump pressure line 1 Attaching screws of front axle support 2 Hydraulic pump drive shaft Remove cap screws (see 1, fig. 3) of front support and separate front end from engine. Take measures to prevent front of tractor from tipping forwards. (Drain fuel tank if it contains too much fuel or support front end of tractor). Remove side frames. Remove pipe clamps (see 4, fig. 2).
Unscrew cap screw 2 and remove retainer 1 which supports the hydraulic pump inlet line 5 and return line 3 of oil cooler (oil reservoir if not equipped with oil cooler). INSTALLATION Make sure woodruff key is installed in shaft of hydraulic pump. On tractors not equipped with HIGH-LOW transmission: Take care that the check valve installed in hydraulic pump inlet line 5 is not lost when the inlet line is removed. Move front of tractor towards engine. Engage pump shaft in hydraulic pump drive shaft and at the same time connect return line of oil cooler (reservoir if not equipped with oil cooler). Slide hydraulic pump inlet line into clutch housing and tighten both lines (see fig. 2).
Tighten cap screw (see 2, fig. 2) securing retainer 1 to the specified torque. Disconnect pressure line 6 at connector situated at front of engine. Disconnect drag link at bell crank. Remove securing screw of hydraulic pump drive shaft. CAUTION: On tractors not equipped with HIGH-LOW transmission: Ensure check valve is inserted in hydraulic pump inlet line before it is installed. Securely support rear of tractor under clutch housing by placing assembly stand 19.58-90.619 under transmission case. Attach front end of tractor to engine, using cap screws (see 1, fig. 3). Tighten cap screws to specified torque. Tighten hydraulic pump drive shaft cap screw to specified torque.
Insert wooden blocks between front axle and front support to prevent the latter from slipping sideways. NOTE: Do not tighten securing screw of hydraulic pump drive shaft until tractor front end is secured to engine. Install fuel transfer pump and connect fuel lines. Suspend front of tractor to a suitable hoist or support with assembly stand 19.58-90.618. Printed in Germany