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MAINTENANCE
INTERSTATER 02/11 Maintenance Section 5-16
© 2011 Alamo Group Inc.
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.
Hydraulic Pump
DISASSEMBLY
1. Disconnect all hydraulic lines. Remove pump assembly from tractor.
2. Plug all ports and thoroughly clean outside 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 assembly from pump housing.
6. If the pistons did not come out with the piston block, remove them, the spider, and the spider pivot.
7. The piston block assembly need not be disassembled unless the internal pins of spring is damaged.
The following procedure should 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 washers. 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.