Easy Maintenance
14
SOP 6
Assembling the Pump Head and Exchanging Piston Seals
This SOP refers to the pump heads 100 ml, 250 ml, 500 ml, and 1000 ml.
All positions of components refer to Fig. 12 „Explosion Diagram and list of parts
of 100 ml, 250 ml, and 1000 ml pump heads“ on page 14.
1.
It is recommended to exchange all four piston seals located in the pump
heads after disassembling the pump head.
Fig. 13
Open side of piston seal
2.
With the open side facing downwards, carefully press the „Piston seals“,
Pos. {3.11} into the „Pump head housing, front block“, Pos. {3.A} and
„Pump head housing, basic plate“, Pos. {3.B}, making sure to keep them
straight.
3.
Insert the O-ring sealings part {3.12}.
4.
Put the two housing parts together, positioning the O-ring side of part
{3.B} against part {3.A}. Be sure that the backflushing capillaries are
positioned on the top side of the head - see label on front of part {3.A} for
orientation.
5.
Insert the two „Spacing bolts“, Pos. {3.14}, screw them in with the hand
and tighten them as firmly as before using the SW 10 spanner.
6.
Put in the two „Distance plates“, Pos. {3.13}, position the „Springs“, Pos.
{3.15} and the „Guides for springs“, Pos. {3.16}.
7.
Put the „Retaining plate“, Pos. {3.18} over the „Guides for springs“, Pos.
{3.16}, with the conical bore of the plate directed outwards.
8.
Insert the two „Retaining plate screws“, Pos. {3.19}, press the plate down
with one hand and tighten the screws with a screw driver, strictly
alternating due to strong force of the „Springs“, Pos. {3.15}.
9.
Carefully insert the piston rods, see „Piston rods“, Pos. {3.17} without
bending or quenching the rods.
10. The „Retaining plate screws“, Pos. {3.19} must be tightened that they are
seated as securely as before.
SOP 7
Installing the Pump Head
This SOP refers to the following pump heads:
100 ml stainless steel, KNAUER order number A 4029-1
250 ml stainless steel, KNAUER order number A 4021-1
500 ml stainless steel, KNAUER order number A 4038-1
1000 ml stainless steel, KNAUER order number A 4022-1
1.
Make sure that the pump head is properly assembled.
2.
Position the head in a straight line onto the pump housing.
3.
Tighten all four „Pump head set screws“, Pos. {3.3} a few turns by hand.
4.
Alternating from one to the next, tighten two diagonally opposed screws
half a turn at a time, until the pump head is correctly seated.
5.
Tighten the two other screws.
6.
Make sure that all four „Pump head set screws“, Pos. {3.3} are securely
tightened.
