15
Hydraulic Pump
Port Plugs
DO NOT
Remove or Adjust
Pressure Check
Bypass Screw
Spring
Ball
Pressure Release
Fig. 7: Hydraulic Pump Assembly
The hydraulic pump is a low-pressure pump with a cast
aluminum body (Fig� 7)� If your pump leaks or malfunctions,
especially if the machine is old or heavily-used, we strong-
ly recommend that you return it to the factory for repair (a
three to ve day process), or purchase a new pump. Call
800-444-1508 for instructions�
It is sometimes possible to repair pumps in the eld by re-
placing parts. We DO NOT recommend eld repair unless
you have experience in working with hydraulics�
See the Hydraulic Pump exploded diagram on page 23�
The various springs in the pump are NOT interchangeable�
General Hydraulic Pump Repair
Disconnect power supply before
servicing or cleaning.
When working with the hydraulic
pump, take care NOT to score surfaces where seals
must be maintained.
1. Unplug or otherwise disconnect the Testing Screen from
its power source, and lock out the connection�
2. Drain the pump. See Draining and Relling the Hydraulic
System on page 14�
NOTE: ALWAYS observe the position of the internal pump
cover before you remove it� Its vent is slightly closer
to the front (handle) end of the pump than to the
back� Gilson recommends using a marker or other
means to mark the operator (front) side of the cover
to ensure correct orientation during reassembly�
3. Remove parts carefully to not damage the pump casting
or any parts to be reinstalled� Balls must NOT be nicked
or scratched� Clean pump and parts, and dry thoroughly
before reassembly�
4. To reinstall balls, tap them gently into their seated
positions with a soft-metal, blunt-ended rod�
DO NOT remove or adjust the bypass
assembly. These parts are assembled and preset at
the factory. Any change in the bypass pressure can
damage the vibrating assembly.
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