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NBT40 SERVICE MANUAL HYDRAULIC SYSTEM

National Crane Published 8-01-2017 Control # 287-11 2-15

Hydraulic Reservoir and Filter

The reservoir, (Figure 2-10) is attached to the front of the

truck bed and has a capacity of 100 U.S. gallons (378.5liters)

to the full mark. The all-steel reservoir has an internally

mounted full flow filter and integral baffles that help cool the

hydraulic oil and prevent foaming.

Hydraulic oil flows through the suction line at the bottom of

the reservoir to the hydraulic pump. Most of the return flow

goes through the filter at the top of the reservoir. The return

lines that go directly into the reservoir (instead of through the

filter) is from the swivel port 1, pump load sense, and

outrigger return lines.

A magnetized drain plug in the bottom of the reservoir

collects metal particles from the hydraulic oil if it becomes

contaminated.

A sight gauge is located on the side of the reservoir to

indicate hydraulic oil level.

A filler cap on the top of the reservoir is for filling the

reservoir. The filler cap includes a strainer for catching

contaminants and gaskets to prevent leaking. A breather cap

(vent) which is part of the filler cap allows air to enter or leave

the reservoir. The breather must be kept clean to prevent

damage to the reservoir.

A large access cover on the top of the reservoir provides

access for cleaning. The cover is secured to the top of the

reservoir with screws and has a gasket to prevent leaking.

The access hole can also be used to fill the reservoir after it

has been completely drained.

The hydraulic oil filter (Figure 2-10) is located in the reservoir

and bolts to the top of the reservoir. The filter housing

contains a replaceable filter element.

A filter element gauge on the filter head indicates how

restricted (clogged) the filter element is. When back pressure

caused by a dirty filter element exceeds 15 psi (103 kPa), the

filter head’s bypass feature allows the hydraulic oil to bypass

the filter and flow into the reservoir.

FIGURE 2-9

Reference Only

Manitowoc National Crane NBT40 Series Service Manual

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