Tennant ATLV 4300 Service Manual page 133

2000 Series Disc Valve Motors
Disassembly
Cleanliness is extremely important when repairing a hydraulic motor.
Work in a clean area. Before disconnecting the lines, clean the port
area of the motor thoroughly. Use a wire brush to remove foreign
material and debris from around the exterior joints of the motor.
Check the shaft and key slot, remove all nicks, burrs or sharp edges
that might damage the bearing housing seals when installing the shaft
and bearing assembly. Before starting the disassembly procedures,
drain the oil from inside the motor.
1 Place the motor in a vise with the output shaft down. Clamp
across the mounting flange of the motor not the housing. Excessive
clamping pressure will cause distortion. When clamping, use some
protective device on the vise, such as special soft jaws, pieces of hard
rubber or board.
Although not all drawings show the motor in a vise, we recommend
that you keep the motor in the vise during disassembly and reas-
sembly. Follow the clamping procedures explained throughout the
manual.
Figure 1
Tie Bolts
Figure 2
2 Remove 4 bolts from motor.
3 Lift valve housing straight up. If done carefully the pins, springs,
balance ring assembly, and valve will remain on the valve plate.
Seal Seal
4 Carefully remove 76,0 [3.00] diameter seal from valve housing.
5 Remove case drain plug—with seal, from valve housing.
6 Remove 2 pins and 2 springs from balance ring assembly, see
Figure 5.
Figure 3
Case Drain Plug
Figure 4
3