Labrie EXPERT Maintenance Manual page 238

228 General Maintenance
Valve Removal
1.
Thoroughly clean the valve and coils
N : The use of brake clean, or similar solvents, may cause damage to the actuator coils.
OTE
2.
Remove the hydraulic tank fill cap to relieve any air pressure from the reservoir.
3.
Remove the hoses and electrical connectors (label them prior to removal to aid in re-assembly).
4.
Attach the lifting device to the valve with the sling, then using the ¾" socket, 6" extension and
ratchet, remove the four ¾" bolts holding the valve mounting plate to the body.
5.
Drain the oil from the valve, set it on a clean, flat surface and, using the ½" socket and ratchet,
remove the valve mounting plate from the valve.
Valve Resealing
1.
Using the 13mm socket/ratchet and 13mm combination wrench, remove the three tie rod nuts
holding the valve assembly together, and remove the tie rods.
2. Thoroughly clean the tie rods, nuts and washers, and lightly lubricate the threads on the tie rods.
3. On the end plate of the valve section, use an o-ring pick to remove and discard the old o-rings,
clean the inside face of the plate, and inspect for cracks, abnormal wear, rust or uneven sealing
surfaces.
4. Slide the tie rods through the backing plate and stand it upward (on end).
5.
Lubricate the o-rings with petroleum jelly and install them into their corresponding seats on the
backing plate.
6.
Ensure the o-rings are pushed fully and evenly into their seats.
7. Starting with the first valve work section, remove the electric coil actuator from the valve work
section using a 5 mm Hex key driver to remove the four socket head bolts that secure it to the
valve body.
Use caution when removing the coil as there are small plungers that may fall out of the coil.
I :
MPORTANT
8.
Clean the sealing surfaces of the valve work section, and inspect for cracks, abnormal wear, rust or
uneven sealing surfaces.
9. Setting the coil carefully on end with the seal side up, use an o-ring pick to remove and discard the
old o-rings and bubble shaped screen filter.
10.
Clean the seats in the coil face and inspect for cracks, abnormal wear, rust or uneven sealing
surfaces.
11.
Using petroleum jelly, lubricate the new o-rings and seal edge of the bubble shaped screen filter.
12.
Install the new o-rings and bubble shaped screen filter, ensuring that they are pushed fully and
evenly into their seats (see the illustrations at the end of this section for seal configuration).