Manitowoc Grove TMS800E Service And Maintenance Manual page 44

HYDRAULIC SYSTEM
pump. Refer to Swing System, page 6-1 for description and
maintenance instructions for the 6-port hydraulic swivel.
The supply pressure and return circuit uses Ports 2, 3, and 5
for pump supply and the dual Port 4 for return. Each
operating circuit's description and components begin with
the circuit's directional control valve.
Hydraulic Reservoir and Filter
The reservoir (see Figure 2-3), attached to the right side of
the carrier frame, has a capacity of 730.6 liters (193 gallons)
total; 656.7 liters (173.5 gallons) 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 hydraulic
oil foaming.
Hydraulic oil flows through the manifold at the lower rear of
the reservoir to the two hydraulic pumps. Almost all of the
return flow goes through the filter at the top of the reservoir.
The return line that goes directly into the reservoir (instead of
through the filter) is from the No. 1 port (drain) of the 8-port
swivel.
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 rear 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
located forward of the reservoir allows air to enter or exhaust
from the reservoir. It is most important that the breather be
kept clean to prevent damage to the reservoir.
A large access cover on the top of the reservoir provides
access for cleaning. The access hole can also be used to fill
the reservoir after it has been completely drained.
An oil temperature gauge is located on the front side of
reservoir to indicate oil temperature.
2-8
The hydraulic oil filter (see Figure 2-4) is located in the rear
of the reservoir. It bolts to the top of 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.
A remote mounted gauge connected to the filter head
indicates how restricted (clogged) the filter element is. When
back pressure caused by a dirty filter element exceeds 1.7
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 valve instead. (Filter
changing instructions are in Return Filter Assembly pg 2-11.)
Pump Distribution
No. 1 Pump
The engine PTO drives the No. 1 pump.
Section 1 of this pump is a piston pump. It supplies the hoist,
lift, and telescope directional control valve. The valve
sections control the following functions: main hoist, boom lift,
b o o m t e l e s c o p e , c o u n t e r w e i g h t r e m o v a l , c a b t i l t ,
superstructure accessory manifold and swing directional
control valve motor, and, when equipped, auxiliary hoist.
Hydraulic oil flowing from this valve bank returns to the
reservoir filter.
Section 2 of this pump is a smaller gear pump that supplies
the integrated outrigger valve.
No. 2 Pump
The No. 2 hydraulic pump mounts directly on the engine. An
engine accessory drive shaft directly drives this two-section
gear pump.
Section 1 of this pump supplies the motor control manifold,
hydraulic oil cooler, and optional superstructure air
conditioner. (The compressor motor runs on hydraulic
power.)
Section 2 of this pump supplies the front axle steering gear
and cylinders and the charge air cooler fan motor.
Published 01-29-2014, Control # 496-00
TMS800E SERVICE MANUAL