Manitowoc Grove RT770E, Руководство по техническому обслуживанию

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2-13
GROVE
RT770E HYDRAULIC SYSTEM
2
Published 11/26/2014, Control # 447-05
Hydraulic Oil Return Filter Assembly
The hydraulic oil return filter assembly (see Figure 2-1 and
Figure 2-2) is located in the reservoir. It bolts to the top of the
reservoir, and its bypass outlet fits into a tube welded in the
reservoir. The filter housing contains a replaceable filter
element. Returning hydraulic oil flows through the filter head,
through the filter element, and into the reservoir.
An element condition indicator on the filter head indicates
when to change the filter element. When back pressure
caused by a dirty filter element exceeds 1.72 bar (25 psi), the
filter head’s bypass feature functions to allow the hydraulic
oil to bypass the filter element and flow into the reservoir
through the bypass outlet instead. A bypass filter screen
prevents gross contamination from passing through the filter
even during bypass.
Refer to the following procedures and Figure 2-2 when
removing or installing the hydraulic oil return filter element.
Element Removal
1. Shut down all hydraulic systems.
2. Wipe any dirt from the cap on top of the return filter
head.
3. Remove the four bolts securing the cap to the return
filter head; remove cap.
4. Inspect the bypass valve (attached to the cap) for any
damage; replace if necessary.
5. Remove and discard the O-ring between the cap and the
return filter head.
6. Remove the element from the return filter head.
Element Installation
1. Replace the filter with one having the same part number
as the one removed. Lube the O-rings on both ends of
the element and insert the element into the return filter
head.
2. Install the cap on top of the return filter head making
sure that the bypass valve is inserted into the element
and that the new O-ring between the cap and filter head
is installed correctly.
3. Secure the cap to the filter head using the bolts and lock
washers; torque bolts to their specified value.
4. Activate the hydraulic system and check for leaks. Make
repairs as needed.
Fill Cap/Breather
Removal and Replacement
1. Wipe any dirt from the fill cap/breather.
2. Unscrew the fill cap/breather from the fill neck.
3. Screw the replacement fill cap/breather into the fill neck.
CAUTION
Ensure that all hydraulic systems are shut down and the
pressure is relieved. Moderate to minor injury may result
when working on a pressurized system.
Wear eye protection. Hydraulic fluid can blind or severely
damage eyes.
CAUTION
Ensure that all hydraulic systems are shut down and the
pressure is relieved. Moderate to minor injury may result
when working on a pressurized system.
Wear eye protection. Hydraulic fluid can blind or severely
damage eyes.