13
Easy Maintenance
SOP 5
Disassembling the Pump Head
This SOP refers to the pump heads 100 ml, 250 ml, 500 ml, and 1000 ml.
3.1
3.3
3.6
3.10
3.19
3.18
3.16
3.15
3.13
3.14
3.11
3.17
3.11
3 B
3.12
3 A
3.10
3.5
3.2
3.A
Pump head housing, front block
3.11
Piston seals
3.B
Pump head housing, basic plate
3.12
O-shaped sealings
3.1
Piston backflushing
3.13
Distance plates
capillaries 1/16“
3.14
Spacing bolts
3.2
Eluent inlets
3.15
Springs
3.3
Pump head set screws
3.16
Guides for springs
3.5
Inlet valve housing
3.17
Piston rods
3.6
Outlet valve housing
3.18
Retaining plate
3.10
Check valves, inlet and outlet
3.19
Retaining plate screws
Fig. 12
Explosion diagram of pump heads
1.
Apply SOP 4 "Removing and Checking Piston Rods".
2.
Loosen the two „Retaining plate screws“, Pos. {3.19} half a turn,
alternating from one to the other to avoid damaging the „Retaining plate“.
3.
Because the two screws are very tight, it may be helpful to either clamp
the pump head or to press one of its side surfaces against a table with
one hand while loosening the screws.
4.
Unscrew the two screws strictly alternating due to strong force of the
„Springs“, Pos. {3.15} behind the plate, and remove them.
5.
Remove the „Retaining plate“, Pos. {3.18}.
6.
You can now remove the „Guides for springs“, Pos. {3.16}, the „Springs“,
Pos. {3.15} as well as the two „Distance plates“, Pos. {3.13}.
7.
Using the SW 10 spanner, loosen and remove the „Spacing bolts“, Pos.
{3.14}. These bolts are seated very tightly. Follow the tip given in step 3.
8.
Lift and remove the „Pump head housing, basic plate“, Pos. {3.B}.
9.
To remove the piston seals, Pos. {3.11} in the basic plate {3.B} and in the
front block {3.A}, use an appropriate tool, e.g. a screw driver and carefully
lever the four piston seals.
