2 - 1
The following paragraphs describe how to connect and
disconnect hydraulic hoses safely.
!!
WARNING
Hydraulic Pressure
Hydraulic fluid at system pressure can injure you. Before
disconnecting or connecting hydraulic hoses or
couplings, vent the pressure trapped in the hoses in
accordance with the instructions given in this
publication.
HYD-1-5
Venting Hydraulic Pressure
Stop the engine. When the engine has stopped, vent the
hydraulic pressure as follows:
a For the hoses at the excavator end, operate the
controls to release the trapped pressure.
b For the hoses at the loader end, turn the starter key to
IGN.
Operate the Auxiliary Attachment Control Switch or the
Auxiliary Attachment Detent Switch for a short time to
relieve residual pressure in the hydraulic circuit.
Turn the starter key to OFF and remove the key.
Connecting the Hoses
1 Connect the hoses. Where the connection is of the
quick release type, see Connecting Quick Release
Couplings on page A/1 - 1. For all other hose
connections, use correct tools and ensure that
connections are not cross-threaded. Support the
weight of the hose until the connection is made. Do
not exceed the recommended torque loading.
!!
WARNING
Fine jets of hydraulic fluid at high pressure can penetrate
the skin. Do not use your fingers to check for hydraulic
fluid leaks. Do not put your face close to suspected
leaks. Hold a piece of cardboard close to suspected
leaks and then inspect the cardboard for signs of
hydraulic fluid. If hydraulic fluid penetrates your skin, get
medical help immediately.
INT-3-1-10/1
2 Check for leaks as follows:
a Start the engine.
b Either operate the Auxiliary Control Switch to build
up pressure in the loader end hoses or operate the
appropriate excavator control to pressurise an
excavator end hose.
c Switch off the engine. Remove the starter key.
Check for signs of leakage at the hose
connections.
Disconnecting the Hoses
1 Vent the hydraulic pressure as described on this page.
2 Disconnect the hoses. Where the connection is of the
quick release type, see Connecting/Disconnecting
Quick Release Couplings on page A/1 - 1. For all
other hose connections, plug both sides of the
connection to prevent loss of fluid.
!!
WARNING
Fine jets of hydraulic fluid at high pressure can penetrate
the skin. Do not use your fingers to check for hydraulic
fluid leaks. Do not put your face close to suspected
leaks. Hold a piece of cardboard close to suspected
leaks and then inspect the cardboard for signs of
hydraulic fluid. If hydraulic fluid penetrates your skin, get
medical help immediately.
INT-3-1-10/1
3 Check for leaks. See Step 2 of Connecting the Hoses.
Section E Hydraulics
9803/8550
Section E
2 - 1
Issue 1
Connecting/Disconnecting Hydraulic Hoses
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