Test 6 – bucket test at the pump -33, Test 7 – bypass the check valve -33 – Hypertherm HPR260 Manual Gas Preventive Maintenance Program Rev.5 User Manual
Page 177
MAINTENANCE
HPR260 Auto Gas
Instruction Manual
5-33
Test 6 – bucket test at the pump
1. Turn OFF the power. Remove the pump outlet, coolant
line, and place it in a 3.8 liter (1 gallon) container. A
Hypertherm coolant container works well.
2. Measure how long it takes to fill the container. Turn ON
the power. Turn ON the pump manually using the
manual pump control button on your CNC screen (see
step 1 under “Manual pump operation”). Write down
how long it takes to fill the container.
If it takes more than 65 seconds to fill the container,
replace the pump and check the motor shaft for damage.
If it takes less than 65 seconds to fill the container, check
the coolant supply line (from the power supply to the
RHF/LHF console) for kinks. If no kinks are found, replace
the by-pass valve and the hoses between the power
supply and RHF/LHF console.
Test 7 – bypass the check valve
1. Turn OFF the power. Remove the hose from the relief
valve.
2. Remove the push-to-connect fitting from the relief valve.
3. Remove the relief valve.
4. Install the push-to-connect fitting and connect the hose.
5