3-32 SHB 803 en – Edition 2.4 * 803s312.fm
Maintenance
3.13 Pressure check
General
• Run the machine warm before checking the pressure! Hydraulic oil temperature: 50 °C
min. (operating temperature)
• In order to measure the secondary pressure limiting valves of the swivel unit, replace
the plug in the measurement connection thread by a measurement connection
(no.1000161137).
• Ensure utmost cleanliness of all measuring points and connections, micro measuring
lines and pressure gages that are connected for checking pressure => even the
slightest traces of dirt, for example a grain of sand, can impair tightness and cause
leaks
Checking the secondary pressure limiting valve (SPLV)
☞The plug and the measurement connection have conical threads and must be sealed
with Teflon tape.
☞Lock the upper carriage
☞Connect the measuring instrument
☞Actuate the swivel unit at full work engine speed.
☞Check and make a note of the pressure value
Checking pressure drop
☞Actuate the swivel unit at full work engine speed.
☞Swiftly reduce engine speed from maximum to minimum
☞Check and make a note of the pressure value
➥The pressure should not drop by more than 10 %.
Pressure check of gear pump P2
Hydraulic supply of rotation, left-hand drive and stick functions
Checking primary pressure limiting valve 1 (PPLV 1)
☞Install a pressure gage with a T-fitting (EVL 8L no.1000015515) and a measurement
connection
(8L no.1000015578) temporarily in the stick circuit.
☞At maximum engine speed, actuate the stick cylinder as far as it will go to
either side
☞Check and make a note of the pressure value.
Checking pressure drop
☞At maximum engine speed, actuate the stick cylinder as far as it will go to either side
☞Swiftly reduce engine speed from maximum to minimum -> pressure drop
☞Check and make a note of the pressure value.
➥Pressure drop should not exceed the specified value by more than 10 %
Fig. 28: Plug instead of measurement connection
Fig. 29: Secondary pressure limiting valve measurement
connection
1000161137
Fig. 30: Primary pressure limiting valve measurement
connection
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