Manitowoc 3900W - Cleaning Charge Pump Sediment Filter; Cleaning Orifice Filter

Cleaning Orifice Filters (see Figure 7)
1. STOP engine(s).
2. Close the shut-off valve between the orifice filter and
the bottom of the oil tank (controlled converter only).
3. Remove the filter assembly from the body by turning
the filter cap counterclockwise.
4. Loosen the disc assembly (do not disassemble) and
soak it in solvent.
5. Clean the oil passage holes in the filter cap.
• . .....
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O~iofilce ~
/ ~,~, Filte
Oil Cap
Passage
Holes
6. Dry the filter discs with compressed air. Then tighten
the filter discs tothe filter cap. Do not over tighten discs;
finger tight is enough.
7. Clean the orifice in the body with a small wire.
8. Reinstall the filter assembly and open the shut-off
valve on the oil tank.
I M PORTA NT Cleaning of orifice and orifice filter is
extremely important. Orifice filter serves three pur-
poses: it prevents solid contaminants from entering oil
tank, it helps maintain system charge pressure by creat-
ing line resistance, and it vents air from system.
Cleaning Charge Pump Sediment Filter (see Figure 8)
1. Loosen the clamp nut and swing the clamp to one
side.
2. Remove the sediment bowl; be careful not to lose the
gasket.
3. Remove the disc assembly from the head.
4. Soak the disc assembly and sediment bowl in clean
solvent.
5. Blow the sediment bowl and disc assembly clean and
dry with compressed air.
6. Assemble the disc assembly to the head finger tight.
7. Check that the gasket is in place and reinstall the
sediment bowl; tighten the clamp nut.
Non-Cont rolled Converters
Figure 7 Orifice Filters
(Con~nue~
FOLIO 941-6
395143