Alamo 803213C, FC-FL-0001 Checking Solenoid Valve, Hydraulic Pump

MAINTENANCE

INTERSTATER 03/09 Maintenance Section 5-16

MAINTENANCE

Checking Solenoid Valve

1. With engine running, turn the mower ON/OFF switch in the "ON" position. Check voltage level at the

solenoid.

2. If it is less than 12 volts, check wiring and ground connections. Checking ground wire is as important as

checking the hot wire. If voltage is sufficient, the solenoid valve is bad and will need to be replaced.

1. Disconnect all hydraulic lines. Remove pump assembly from tractor.

2. Plug all ports and thoroughly clean out side of pump.

3. Clamp the end of the drive shaft in a protected jaw vise with the body of the pump up and remove the six

cap screws from the back plate.

4. Use a plastic mallet and tap the back plate assembly to loosen it, then pull back plate straight up until it is

free. Remove gasket.

5. Remove pump from vise and remove rotating asse mbly from pump housing.

6. If the pistons did not come ou t wi th the pis to n block, remove them, th e spid e r, and the spide r pivo t.

7. The piston block assembly need not be disassembled unless the internal pins of spring is damaged.

The following procedure sh ould be used if the spring is to be removed from the piston block

assembly. The spring is highly compressed and the snap ring should not be removed

without first compressing the spring.

The following parts will be needed to disassemble the piston block:

2 ea. 3/8 I.D. x 1-1/8 O.D. flat washer

1 ea. 3/8 x 3-1/4 N.C. capscrew

1 ea. 3/8 N.C. nut

Place one of the flat washers over the 3/8 x 3-1/4 cap screw and place this through the center of the piston

block. Place the other washer over the cap screw and let it rest on the three pins. Screw the nut on and

compress the spring inside the piston block. Use a pair of snap ring pliers and remove the internal snap ring.

Remove the bolt and the two wash ers. Remove the washers, spring, three pins, and the internal pin keeper.

8. Remove snap ring from housing. Press shaft from housing and remove shaft seal and washer.

9. Remove the two snap rings, thrust bearing, and two thrust washers from the drive shaft.

10. To remove the cam plate from housing, remove the four screws from sides of the housing. Remove

trunnion cover, seal cover, and o-ring cover. Remove o-ring, seal, two washers, inner race, and needle

bearings. The cam plate can now be moved over to one side and removed. The cam plate pivot bearing

are a loose slip fit into the housing. Do not be concerned if they are not tight.