Hydraulic Equipment

Hydrostatic Pump Input Shaft Seal Replacement

NOTE: Replacement of the drive shaft seal (A, Fig. 509) on Eaton hydrostatic pumps requires Shaft Seal Install Kit [Manitou part # 50290619].

NOTE: Early machines pumps are shown; input shaft seal replacement on later machines is similar.

Input Shaft Seal Removal

1.Use a retaining ring pliers to remove retaining ring (B, Fig. 510).

2.Punch a starter hole in shaft seal using a hammer and punch (C).

3.Blunt the point of a 3” sheet metal screw (D), and thread the screw into the hole made in the shaft seal during the previous step.

4.Use a pliers to pull shaft seal out just far enough to pull it out of it’s pocket (E).

5.Carefully insert the blade of a screwdriver behind the seal (F), and gently work the seal out.

IMPORTANT: Use care not to damage the drive shaft and/or the seal bore. Damage to the shaft and/ or seal bore will prevent proper sealing of the pump.

Input Shaft Seal Installation

1.Slide bullet tool (G, Fig. 511), included in Shaft Seal Install Kit, part number 50290619, over the pump drive shaft (H) as shown.

2.Apply a coat of fresh, clean hydraulic oil to the inside surface of a new shaft seal (part number 50288200).

3.Slide new lubricated seal (I, Fig. 512) over the bullet tool.

IMPORTANT: Orient seal (I) as shown in Fig. 512.

4.Gently tap seal (I, Fig. 513) using seal driver (J), included in the Shaft Seal Install Kit, over bullet tool (G) and insert the seal just inside the drive shaft bore in the pump.

IMPORTANT: Insert seal (I) only far enough to install retaining ring (B, Fig. 510) into the retaining ring groove in the drive shaft bore.

5.Remove seal driver (J) and bullet tool (G).

6.Using a retaining ring pliers, insert retaining ring (B, Fig. 510), removed during disassembly, into the drive shaft bore but not in the groove.

7.Gently tap retaining ring (B, Fig. 514) using seal driver (J) into the drive shaft bore until it snaps into the groove.