ACTUATOR AS 1187590 - Caterpillar

1. Remove oil pump suction pipe (1). Remove bolts (3) and cover (2) from the timing gear cover. 2. Loosen setscrew (4) and remove guide (5), relief valve spring and plunger. 3. Remove inner rotor (6) and outer rotor (7) from the timing gear cover. 4. Measure the inside diameter of bearing (8). The inside diameter must be 2.8041 .0022 in. (71.244 0.056 mm). Remove the bearing as needed.Install Oil Pump And Relief Valve
1. Thoroughly clean all of the parts. Put oil on all of the parts. 2. If the bearing was removed from the timing gear cover, install a new bearing with tool (A). For the correct location of bearing junction, see the topic OIL PUMP in the SPECIFICATIONS. 3. Install inner rotor (2) and outer rotor (1) in the timing gear cover.4. Measure the clearance between the rotors with a feeler gauge. The clearance must be .002 to .006 in. (0.05 to 0.15 mm). The maximum permissible clearance is .009 in. (0.23 mm). Make a replacement of both rotors if the clearance is not correct. The rotors can not be ordered separately.5. Put the plunger and spring in position and push the guide into the cover with a press until the lip on the guide is even with the finished surface on the cover. Make sure the flat surface on the guide is in alignment with the setscrew. Tighten the setscrew. 6. Put cover (3) in position on the timing gear cover. Install the locks and bolts (4).7. Check the oil pump end clearance with a feeler gauge. The end clearance must be .004 .002 in. (0.10 0.05 mm). If the end clearance is not correct, make a replacement of BOTH rotors or cover (3). The rotors can not be ordered separately.end by: a) install timing gear cover and oil pump