Grove Published 01-29-2015, Control # 512-01 2-7
TMS700E SERVICE MANUAL HYDRAULIC SYSTEM
• Hydraulic hose assemblies operating in climate zone “C”
are recommended to be replaced after 8000 hours of
service life.
• Hydraulic hose assemblies operating in climate zones
“A” or “B” with high ambient temperatures, could see
hose service life reduced by 40% - 50%. Therefore, it is
recommended to replace these hoses after 4000 - 5000
hours of service life.
• Hydraulic hose assemblies operating in climate zones
“D” and “E” cold climates should expect a degrade of
mechanical properties such as elasticty.Therefore it is
recommended that these hoses be inspected and
addressed accordingly.
SUPPLY PRESSURE AND RETURN CIRCUIT
Description
The supply pressure and return circuit is made up of several
circuits which route hydraulic oil from the three hydraulic
pumps to the directional control valves for the individual
operating circuits. The supply pressure and return circuit
consists of the reservoir and integral filter, three hydraulic
pumps, a hydraulic oil cooler, and a 5-port hydraulic swivel.
Refer to Hydraulic Pumps, page 2-14 in this section for
descriptions and maintenance instructions for each hydraulic
pump. Refer to Swing System, page 6-1 for description and
maintenance instructions for the 5-port hydraulic swivel.
The supply pressure and return circuit uses Ports 1, 3, and 4
for pump supply and the dual Port 2 for return. Each
operating circuit’s description and components begin with
the circuit’s directional control valve.
Hydraulic Reservoir and Filter
The reservoir (Figure 2-2), attached to the right side of the
carrier frame, has a capacity of 564 liters (149 gal) total, 507
liters (134 gal) 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 three 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. 5 port (drain) of the 5-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 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) is located on top of the reservoir to allow 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 cover is secured to the top of the
reservoir with a band clamp and has a gasket to prevent
leaking.
An oil temperature gauge is located on the end of the
reservoir to indicate oil temperature.
The hydraulic oil filter (Figure 2-3) 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.
A gauge installed in the filter head indicates how restricted
(clogged) the filter element is. When back pressure caused
by a dirty filter element exceeds 1.70 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. (Filter changing instructions are in
Return Hydraulic Filter Assembly, page 2-10.)
Pump Distribution
No. 1 Pump
The engine PTO driven pump drive drives the No. 1 pump.
The pump drive converts the PTO shaft’s 2070 rpm at engine
speed of 1800 rpm to 2604 rpm. (The engine speed is limited
to 1800 rpm when operating crane functions; the PTO spins
at 1.15 times the engine speed; the pump drive output shaft
speed is 1.258 times the PTO speed.) The pump drive has a
disconnect to stop power transfer to the No. 1 pump.
Section One of the No. 1 hydraulic pump supplies the hoist,
lift, and telescope directional control valve. The valve
sections control the following functions: main hoist, boom lift,
boom telescope, and, when equipped, auxiliary hoist.
Zone Classification
A
Tropical Moist: All months average above 18°C
(64.4°F). Latitude: 15° - 25 ° North & South
B
Dry or Arid: deficient precipitation most of the year.
Latitude: 20° - 35° North & South
C
Most Mid-Latitude: Temperate with mild winters.
Latitude: 30° - 50° North & South
D
Moist Mid-Latitude: Cold Winters. Latitude: 50° -
70° North & South
E
Polar: Extremely cold winters and summers.
Latitude: 60° - 75° North and South
Reference Only
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