Southworth Products
PUN Manual
PUN Manual
21
3. Each valve used on this machine is designed with a solenoid coil which can be
changed without removing the valve or spilling any hydraulic fluid. To change the
solenoid:
• Disconnect the wire leads to the solenoid.
• Loosen the knurled nut at the top of the solenoid, and remove the nut and
O-ring.
• Slide the solenoid off of the core tube.
4. To clean the parts on the valve spool, you must remove it from the valve
body. De-pressurize the hydraulic system by lowering both lifting mechanisms
completely. Be sure to turn off the power to the machine.
5. Unscrew the core tube. Remove the valve plunger and inspect it for dirt or metal
chips which could block the valve action. Clean the valve plunger as required,
then blow it clean with compressed air. Before reassembly, verify that the inside
of the valve body is clean and free of debris. Depress the plunger by hand
several times to be sure it moves freely.
6. To reassemble, reverse the steps listed above. The nut which holds the solenoid
should be finger-tight only!
8.6 Removing a Cylinder
To avoid death or serious injury:
• All repair or maintenance shall be performed with the bucket in the fully
lowered position. See the Maintenance section before beginning any work.
• Hydraulic Cylinders are heavy. Falling cylinders can cause serious injury.
This section will tell you how to remove a cylinder from the tilt mechanism or the dump
mechanism. Two cylinders are used on each mechanism. Both types of cylinders are
double-acting, and both have the same bore diameter. The following procedure will apply
to both cylinder types.
Before beginning this procedure, please read and understand this entire section.
1. Before you remove a cylinder, be sure that you have these items on hand:
• Replacement cylinder or cylinder packing kit.
• A supply of new hydraulic oil. Contaminated oil may damage the new
packing.
• Containers to catch the used oil.
• A clean place to work which will not be damaged if you spill some oil
(especially if repacking the existing cylinder).
2. Lower the bucket completely to the loading position (as discussed earlier).
3. Turn off the electrical power at the main disconnect or circuit breaker. Follow
