Reference
Only
HYDRAULIC SYSTEM
999 SERVICE/MAINTENANCE MANUAL
2-6
Published 05-16-17, Control # 233-03
Replacing Filter Elements
This crane is equipped with up to five hydraulic oil filters (see
table below):
•
Free fall (1) filter for each optional free fall drum filters
the return oil to tank.
•
Suction filter (10), which is a mesh screen, filters the oil
to the charge pumps.
•
Charge filter (14) filters charging oil to the optional
auxiliary drum charge pump.
•
Main charge filters (17) filter charging oil to all of the
pumps (except auxiliary).
The system fault alert will come on in the operator’s cab
when any of these filters plugs with dirt (see Digital Display
Readings in 999 Operator Manual). The alert indicates which
filter element needs replacing, as follows:
It is normal for the alert to come on at start-up when the oil is
cold. If the filters are not plugged, the alert will turn off after
the hydraulic oil warms up.
The following procedure is for filters (1, 14, and 17).
To clean or replace filter (10), the hydraulic tank must be
drained (see
procedure to clean or replace this
filter).
1.
Stop engine.
2.
For filters (1, 14, and 17), close filter shut-off valve (15).
3.
Place a container below filter element to be replaced.
4.
Clean outside of filter element and area around base.
5.
Using filter wrench, loosen filter element.
6.
Turn element off. Place filter element in container.
7.
Lubricate gasket on new element with clean hydraulic
oil.
Do not use grease
.
8.
Make sure gasket is securely attached to element.
9.
Do not fill new element with oil.
10.
Screw new element onto filter housing until gasket
contact is snug against base.
11.
Tighten element by hand 1/2 turn more so that gasket is
properly seated and filter element does not leak.
12.
Start engine and allow hydraulic system to return to
operating pressure. Check filter element for leaks.
Tighten element as required to stop leakage.
13.
For filters (1, 14, and 17), open filter shut-off valve (15).
Changing Oil
Drain and refill hydraulic system every 1,000 hours or
semiannually, whichever occurs first, unless an alternate
interval is established through an oil analysis program.
1.
Operate crane until hydraulic oil is at normal operating
temperature. This will help prevent impurities from
settling in system.
2.
Stop engine.
3.
Attach a rubber hose to the pipe on drain valve (18) and
insert the hose in a suitable container to catch hydraulic
oil. Tank capacity is 120 gallons (454 liters) to full (cold)
(gantry up) mark on sight gauge.
4.
Open drain valve (18) to drain tank.
5.
Clean all dirt off access cover (11) on bottom of tank and
two covers (11) on top of tank. Then remove covers from
tank. Take precautions to prevent dust and wind-blown
dirt from entering tank while covers are off.
6.
Flush out any sediment inside tank.
7.
Clean/replace suction filter (10):
a.
Using a wrench, remove suction filter from inside
tank.
b.
Soak filter in clean, nonflammable solvent. Brush off
outer surface, and flush from inside out. Replace if
damaged.
c.
Reinstall suction filter.
8.
Use new seals and securely fasten access covers to
tank.
9.
Clean breather (5):
a.
Remove breather.
b.
Soak breather in clean, nonflammable solvent. Blow
out with compressed air to clean. Replace if
damaged.
c.
Securely reinstall breather with thread sealant.
Filter
(
Digital Display Reading
1
FFALL FILTER
10
HYD SUCTION FILTER
14
AUX DRUM CHRG FILTER
17
MAIN CHARGE FILTER
CAUTION
Equipment Damage!
Be sure to drain oil from and add oil to hydraulic tank, not
fuel tank. The two tanks are next to each other on right
side of crane. Hydraulic tank is to rear of fuel tank.
Summary of Contents for 999
Page 1: ...R e f e r e n c e O n l y Service Maintenance Manual Manitowoc 999 ...
Page 2: ...R e f e r e n c e O n l y ...
Page 4: ...R e f e r e n c e O n l y THE ORIGINAL LANGUAGE OF THIS PUBLICATION IS ENGLISH ...
Page 297: ...R e f e r e n c e O n l y ...
Page 298: ...R e f e r e n c e O n l y ...