Home » John Deere » 1025R » John Deere – 1023E, 1025R and 1026R – Disassemble and Inspect Hydrostatic Drive

John Deere – 1023E, 1025R and 1026R – Disassemble and Inspect Hydrostatic Drive

→NOTE:
Components of the hydrostatic drive unit are not serviceable except for the seals.

[1] – Remove lever from control shaft. Clean shaft of any dirt or burrs.

[2] – Remove socket-head bolts (A and B). Separate valve block from housing.

[3] –
→NOTE:
Keep hydrostatic pump and motor rotating assemblies on shafts. Be careful to not scratch mating surfaces of rotating assemblies and plates.

Inspect motor (c) and pump plates (D) for wear.

[4] – Remove and inspect valve (E).

[5] – Remove and inspect reverse valve (F).

[6] – Remove and inspect forward valve (G).

[7] – Remove gasket (H). Ensure that all gasket material is removed from block passages and bearing surfaces.

[8] –
→NOTE:
Keep hydrostatic pump and motor rotating assemblies and components
separated for later reassembly to proper location.

Position housing on its side to remove pump and motor rotating assemblies.

[9] – Remove pump and motor rotating assemblies. Inspect plungers for wear or damage.

[10] – Inspect mating surface for scratches.

[11] – Inspect spring inside of rotating assemblies.

[12] – If disassembly is required, press in washer with appropriate sized socket and remove snap ring (I), washers (J), and spring (K).

[13] – Remove pump outer race (L) and thrust bearing (M).

[14] – Remove motor race (N), thrust bearing (O) and motor output shaft (P).

[15] – Inspect thrust bearings, races, and shaft surfaces for damage.

[16] – Remove snap ring (Q) securing through shaft assembly to housing.

[17] – Tap shaft with seal, spacer, and bearing from housing. Inspect bearing for damage.

[18] – Remove socket-head bolts from trunnion bearing housings (R). Hold swash plate (S), and remove housings with care to protect swash plate trunnion bearing surfaces.

[19] – Remove swash plate, exercising care to protect bearing surfaces.

[20] – Inspect trunnion bearings and bearing surfaces for wear or scratches.

[21] – If damage to any bearings or bearing surfaces are found, replace complete hydrostatic drive unit.