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7. Maintenance and Servicing
7.1 Lubrication
The gear is lubricated automatically provided the pump revolves in the correct direction. Oil level should
be checked every three months and topped up if necessary till oil can be seen through the indicator glass
(24). First oil change after 3 months operation and then every 2 years, or every 6 months if the pump is
running continuously. This is done by unscrewing the indicator (24) or screw (16) and draining out the old
oil. Clean out the crankcase thereafter (removing gear cover [2]) and refill with fresh oil as described
under paragraph 6.1.
7.2 Stuffing Box
The compact stuffing box is made up of Teflon-impregnated packing rings and a seal ring and requires
practically no maintenance at all. The stuffing box must not run dry. Single isolated drops serve to
lubricate and cool it. Should the stuffing box continuously drip, tighten stuffing box nut (6a) carefully by
approx. one 1/2 turn. If this does not help, the whole stuffing box (6d) must be replaced. In this case, the
seal ring (6b) should also be changed. Pay careful attention when installing seal ring: the lip ring spring
must face the piston.
7.3 V-Belts
V-belt (34) should not be overtensioned. However, it is advisable to tighten belts up again after a few
days of operation. When renewing V-belts on multi-belt drive, the complete set has to be replaced.
7.4 Gear
The original SPECK high pressure ‘’Büffel’’ pump has a double-herringbone (helical) precision gear with a
bronze connecting rod. If the directions under paragraph 7.1 for lubrication are followed, further
maintenance is practically unnecessary. Only the connecting rod alone might need readjusting after
approx. 1 year when it has been run in and if a possible knocking sound can be heard. To do this,
unscrew self-locking hexagon nut (17c), screw out inner hexagon tension screw and remove 0.1 - 0.5 mm
of spacer shims (405) as required from connecting rod joint. Screw back tension screw (17a) tightly
against hexagon nut. After approx. 1 hour of operation, check whether the connecting rod has not been
overadjusted and is running hot.
7.5 Air Replenishment - for Cold Water Operation Only
The pump will run smoothly and silently if there is air in the air chamber. This air cushion is regulated via
the snifting valve. At the same time air is pumped into the pressure tank. The more air there is in the
pressure tank, the more water can be discharged before the pump switches on again (see paragraph
4.2).
If the automatic air volume control has to be repaired, kindly ask for our instruction sheet D10672. The
unit itself is only available as a complete set.
Abb. 115 Crosssectional Diagramm of Casing
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