17
7. Lift the power unit and rotate it toward the rear of the
pump platform. (See Figure 2-5).
NOTE: If the oil has not been previously removed from
the reservoir, the power unit can be rotated and tipped to
allow most of the oil to be drained out of the reservoir
filler hole, once the filler cap is removed.
Figure 2-5
8. Loosen the band clamp, which holds the reservoir on
the center section. Pull and twist the reservoir until it
separates from the center section. Place a container
under the power unit to catch spilled oil. Note the position
of the reservoir oil pick-up tube and be sure the tube is in
the same position when the filter is removed and
installed. (See Figure 2-5) and (See Figure 2-6).
9. Clean the inside and outside of the reservoir with a
suitable solvent.
Figure 2-6
10. Pull the filter screens from the oil pick up tube and
return tube and clean them with a suitable solvent. Blow-
dry the filter from the inside with low-pressure air. (See
Figure 2-6).
11. Carefully re-install the filter screens. Use care when
handling the screens to avoid damage.
12. Inspect the O-ring between the reservoir and the
power unit center section and replace it if damaged. Wipe
the surface of the O-ring with fresh oil and then push the
reservoir onto the center section of the power unit. Be
sure to reposition the reservoir so that the oil filler cap is
in the same location as before removal.
13. Tighten the band holding the reservoir to 80-120 lb-
in. torque.
14. Rotate the power unit back into position. Insert the
two 5/16" cap screws. Use new lock nuts and torque to
22-25 lb-ft.
15. Reinstall the electrical wires removed in step 4.
16. Remove the lift cylinder hose(s) from the valve block.
Remove the swing cylinder hoses from the fitting in the
valve block. Mark hoses before removal to be certain
they are reinstalled in the correct location.
17. Place the hoses in a container to catch oil expelled
from cylinders. Cycle the lift cylinder by disconnecting
hitch pins and pushing and pulling on light bar. Cycle
swing cylinders by disconnecting from swing frame and
pushing and pulling on cylinder rod.
18. Reconnect swing cylinders and install hitch pins.
19. Reconnect hoses. Lift cylinder hoses are torqued to
20-25 lb-ft and swing cylinder hoses are torqued to 12-15
lb-ft.
20. Fill the hydraulic reservoir with type 5606 hydraulic
fluid until the fluid registers full on the sight line.
NOTE: Vehicle must be parked on level ground and plow
must be in lowered position in order to properly check the
reservoir level.
21. Refer to controls manual and cycle plow to remove
air from hydraulic system. Refill reservoir as needed.
22. Operate system and check for leaks. Repair and
replace components as necessary.
FILLER
CAP
RESERVOIR
POWER
UNIT
FRONT
FILTER
SCREEN
PICK-UP
TUBE
RETURN
TUBE
CAUTION
Do Not use Teflon tape or pipe dope on
hydraulic fittings. These can dislodge and jam
valves in the hydraulic system.
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