Manitowoc 777 Service And Maintenance Manual

Reference Only
777 SERVICE MANUAL HYDRAULIC SYSTEM
Manitowoc Published 10-01-2012, Control # 045-08 2-5
2
7. Lubricate seal on new filter element with clean hydraulic
oil.
8. Install new filter element hand tight on filter housing. Do
not fill new element with oil.
9. Using a filter wrench, tighten element an additional 1/4
turn.
10. Loosen vent plug at outlet port of filter housing
(Figure 2-2, View A).
11. Open shut-off valve at filter inlet (turn counterclockwise)
and allow hydraulic oil from tank to fill filter element.
12. Watch for oil coming from vent plug at filter outlet
(Figure 2-2, View A).
13. Securely tighten vent plug when oil appears. This filter
supplies oil to charge pump inlets. It is important that
this filter be full before starting engine. If filter is not
full, air will be pumped into hydraulic system.
14. Start engine and allow hydraulic system pressure and
temperature to rise to normal.
15. Check filter element for leaks. Repeat step 9 if element
is leaking.
Filter 2
See Figure 2-3 for following procedure.
1. Clean area around filter bowl and head.
2. Place a container below bowl to catch oil.
3. Open drain plug at bottom of bowl and drain oil into
container.
4. Using a filter wrench, loosen bowl.
5. Remove bowl. Element will remain attached to head.
6. Remove filter element and discard.
7. Lubricate new O-ring with clean hydraulic oil and install
in bowl.
8. Push new filter element into head and seat element.
9. Fasten bowl hand tight on head. Do not fill bowl with
oil.
10. Using a filter wrench, tighten bowl an additional 1/4 turn.
11. If necessary, install a new O-ring on drain plug and
securely install drain plug in bottom of bowl.
12. Start engine and allow hydraulic system pressure and
temperature to rise to normal.
13. Check filter bowl for leaks. Repeat step 10 if element is
leaking.
Filters 3 and 4
See Figure 2-2 for following procedure.
1. Stop engine.
2. Place a container below filter element to catch oil.
3. Clean area around filter element and filter housing.
4. Using a filter wrench, loosen filter element.
5. Remove filter element and discard.
6. Lubricate seal of new filter element with clean hydraulic
oil.
7. Install new filter element hand tight on filter housing. Do
not fill new element with oil.
8. Using a filter wrench, tighten element an additional 1/4
turn.
9. Start engine and allow hydraulic system pressure and
temperature to rise to normal.
10. Check filter element for leaks. Repeat step 8 if element
is leaking.
O-Ring
Drain Plug
Bowl
Element
O-Ring
Head
FIGURE 2-3
A994

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English