DrVe And Brake System Wheel DrVe - Mec Speed Level Series Service & Parts Manual

Secton 5 - Hydraulc System
Drive And Brake System Wheel Drive
Note:Refer to Section 7 for Remove and Install instructions. Refer to Parts Section 14.
There are four (4) hydraulic fixed-displacement gear wheel motors to provide power to all four wheels.
Dynamic Braking Circuit
The two (2) rear wheel motors have integral spring-held brakes. Hydraulic pressure developed in
the drive circuit during drive mode releases the brakes. A fixed orifice in the brake circuit controls the
brake application to provide a smooth stop.
Front Wheel Motors (DT-701)
Refer to page 31.
Housing And Shaft Disassembly
1. Remove all shaft-related components from the shaft. Secure the motor housing in a vise.
• Remove the retaining ring from the grove in the pilot of the housing.
• Remove the spacer from the housing.
• Remove the shaft from the housing.
• Remove the bearing, thrust bearing, and two (2) thrust washers from the shaft.
2. Being careful not to drop bearing rollers,
• Pry out the shaft seal, backup seal, and dust seal from the bearing assembly.
Note:It is not necessary to remove the metal backup ring from the bearing to service the motor.
• Remove the high pressure seal from the groove in the pilot of the housing.
• Discard shaft seal, backup seal and high pressure seal.
3. Clean all parts in an oil-based solvent and dry using compressed air.
Housing And Shaft Assembly
1. Apply a light coating of fluid to all new seals prior to installation.
• Install the high pressure seal into the groove in the pilot of the housing.
2. Place the shaft on a clean, flat surface with the output end facing up.
• Place the first thrust washer, thrust bearing and second thrust washer over the shaft.
• Using plastic installation sleeve, place the shaft seal over the shaft with the lip facing down.
• Repeat for the backup seal, making sure the lip faces down.
• If the metal backup ring came out in Step 2 above, place it over the shaft with the large O.D.
facing down.
• Lightly grease the bearing and place it over the shaft with the large O.D. facing down.
• Use an arbor press to carefully press the bearing down to press the seal assembly into the
bearing.
3. Place the shaft assembly into the housing.
• Place the dust seal over the shaft with the lip facing up.
• Place the bearing spacer and retaining snap ring over the shaft.
Note:It may be necessary to lightly tap the snap ring and bearing spacer to allow the retaining ring to
seat properly.
Page 29 Speed Level Seres - Servce & Parts Manual
January 2019