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John Deere – 1023E, 1025R and 1026R – Inspect Oil Pump: 3TNM74

[1] – Remove timing gear cover. (See Remove and Install Timing Gear Cover in this Group.)

[2] – Align all timing marks (A), (B), and (C).

[3] – Remove three cap screws securing idler gear shaft (D) and remove idler gear and shaft.

[4] – Remove three cap screws (E) securing oil pump and remove oil pump.

[5] – Measure the clearance between the OD of the outer rotor and the pump bore with a feeler gauge (F).

[6] – Compare measurement to specification. If measurement is larger than specification replace oil pump.

[7] – Place a straight edge (G) across pump body and use a feeler gauge (I) to determine side clearance between outer rotor (H) and straight edge.

[8] – Compare reading to specification. If reading is more than specification replace oil pump.

[9] – Measure between high spots of inner and outer rotors (J) with a feeler gage. Compare
measurement to specification. If measurement is larger than specification replace oil pump.

[10] – Remove relief valve cap (K). Inspect spring (L), valve plunger (M), and valve seat inside pump body. If any parts show wear or damage replace oil pump.

[11] – Install pump in reverse order of removal. Tighten Mounting cap screws to specification.