MTS Model 293-22 Hydraulic Service Manifold - Manual (Page 47)

Warning :
The rapid expansion of pressurized gas can propel objects and generate concussive forces.
The spray of pressurized fluid can be hot and piercing. With pressure supplies turned off,
residual pressure in the system can cause machinery to move.
Pressurized gas and pressurized fluid can result in injury or death.
Unless required for a procedure, turn off hydraulic, pneumatic, and water supply to the system
before performing maintenance. Isolate the system from the supply sources. Make sure that
all of the associated pressure gages read zero (0).
1. Turn off the HPU or remove hydraulic pressure from the hydraulic input of the HSM.
2. Place a drain pan under the filter drain port and remove the cap from the port.
3. Remove the vent plug from the filter bowl. Allow the fluid to drain for five minutes.
4. Unscrew the filter top and remove it.
Caution :
Contaminated hydraulic fluid can collect inside a filter housing around the base of the filter
element.
If contaminated fluid gets into the system supply lines, erratic system operation can result
due to contamination of the system servovalves.
Do not remove a filter element from its housing without first removing all contaminated fluid
from around the base of the element. Make sure that the area around the base of the filter
element is free of contaminated fluid before removing the element.
5. Check the filter bowl for contamination (particles adhering to the inside of the bowl). If contamination
is present, check the system for wear or loss of seal integrity. Wipe the bowl out with a lint-free cloth.
6. Carefully clean all contaminated fluid from around the base of the filter element.
7. Remove the filter element and inspect it for physical damage. If it is damaged, replace it and proceed
to step 14.
Note:
Ultrasonic cleaning is the preferred method for cleaning the filter. The cleaning and rinsing
solutions may be obtained from MTS as part numbers 111617-01 and 111617-02, respectively.
If an ultrasonic unit is not available, these solutions can be used with a plastic bristle brush for
manual cleaning.
8. Fill the ultrasonic unit tank with approximately 130 mm (5 in) of water and allow it to warm up for 10
minutes.
9. Obtain a plastic container with sufficient volume to entirely submerge the element and small enough
to stand in the ultrasonic unit. Fill it with cleaning solution.
10. After removing any rubber components, such as the ring seal, from the element, place it in the container
and agitate it by hand for two minutes.
11. Remove it and apply pressurized air to remove large particles.
Model 293.22 Hydraulic Service Manifold | 47
Maintenance