In the previous article we looked at the beginning of disassembling the DPO automatic transmission. In this article, we will continue disassembling the transmission
Examine all foreign inclusions and particles found in the pan and on the magnet to determine the condition of the transmission components.
The presence of clutch wear particles indicates wear of the drive plate or brake bands.
Steel particles on the magnet indicate wear of the bearings, gears, or drive plate.
The presence of aluminum particles indicates wear of the bushings or transmission housing.
If there are a lot of foreign inclusions and particles, replace the torque converter and carefully inspect the condition of the transmission components.
Unscrew the rear cover of the gearbox (Fig. 18)
Remove the fourth gear piston (Fig. 19)
Remove the rear cover gasket (Fig. 20)
Remove the input shaft (Fig. 21)
Remove the clutch pack for the second, third and fourth gears (Fig. 22)
Remove the small sun gear and one-way clutch (grip) (Fig. 23)
Remove the fourth gear clutch pack (Fig. 24)
Helpful tips:
If the drive plate or brake band is replaced with new ones, soak the new part in automatic transmission fluid for at least two hours before installation.
Put automatic transmission fluid on all oil seals, rotating parts, O-rings, and moving parts before assembly.
All O-rings, oil seals, and The gaskets must be replaced with new ones.
When reassembling, use technical petroleum jelly, but do not lubricate with grease.
When it is necessary to replace a bushing, replace the part (unit) containing the same bushing.
After applying the sealant, assembly must be carried out within 10 minutes and held for 30 minutes before filling with automatic transmission fluid.
Next, we need to remove the reverse gear servo piston.
To do this, rest the wooden handle of the hammer on servo piston and use pliers to compress the retaining ring (Fig. 25)
Removing the servo piston from the gearbox housing (Fig. 26)
Removing the reverse gear servo piston from the gearbox housing (Fig. 26)
Removing the brake band of the reverse gear (Fig. 27)
Removing drum with planetary block (Fig. 28)
After this, all parts are washed and inspected. We will consider the assembly of the gearbox in the next article.
