Model 4700 Maintenance Manual
Section 7. Component Procedures
Drive and Brake
Drive Unit/Motor Assemblies
Single Traction Motor Trucks
4. Remove both the fill and drain plugs. Allow fluid to drain out completely.
The drive unit/motor assembly consists of a planetary gear type drive unit and an AC motor.
5. Clean any ferrous residue from the magnetic drain plug. Replace the drain plug.
Drive units on trucks below S/N 10677 have a automotive type shoe brake. See “Brake Service - S/Ns below 10677” on page 7-29. Drive units on trucks S/N 10677 and up have a internal wet-brake system. See “Brake Service - S/Ns 10677 and up” on page 7-30.
6. Use a flexible hose with either a syringe or a funnel to add new fluid through the fill plug hole until it is visible halfway up the level window (approx. 2.6 qt./2.5 liter). Refer to "Lubrication Specification Chart" on page A-2. Install the fill plug.
Changing Fluid
7. Clean the area around the fill and drain plugs.
S/Ns below 10677
8. Run the truck for several minutes. Check fluid level again. Add fluid as necessary.
1. Run the truck for a few minutes to warm the fluid. 2. Clean the area around the fill and drain plugs. See Figure 7-22. Figure 7-22.
Drive Unit Plug Locations
S/Ns 10677 and up NOTE : S/N trucks 10677 and up require a specific break-in oil (P/N 990-603/SPL) for the first 1500 hours of operation. 1. Run the truck for a few minutes to warm the fluid.
Fill Plug Level Window
2. Clean the area around the oil fill/oil level plug and drain plugs. See Figure 7-23. Figure 7-23.
Drive Unit Plug Locations
Brake Bleeder Oil Filler/Oil Level Plug
Drain Plug
Oil Drain Plugs
3. Remove the oil fill/oil level plug. Remove the sealing ring from the plug. 4. Place suitable container(s) below the drain plugs. 5. Remove the drain plugs. Remove the sealing rings from the plugs. Allow fluid to drain out completely. 3. Place a suitable container below the drain plug.
Publication 1160093, Issued: 20 May 2013
6. Clean any ferrous residue from the magnetic drain plugs. Install the drain plugs with new sealing rings.
7-27
