User's Manual

Page 2
Manzel
®
Model 88 Pump
L51025
Pumps With Gravity Feed and Pressurized
Supplies
Rotation of the lubricator cam actuates the pump rocker arm
assembly to operate the pump piston. On the piston downstroke,
spring force is exerted on the piston causing it to follow the cam.
As it moves down, a pressure reduction is created in the area
between the piston and the discharge check valve. The gravity
feed or pressurized supply unseats the supply inlet shutoff ball
and fills the piston bore with lubricant. On the piston upstroke, the
oil in the piston cylinder reseats the inlet shutoff ball and is forced
out through the discharge check valve to the machine injection
point. Pump volume can be adjusted by means of an external
screw. This changes the length of the piston stroke which
changes the pump discharge volume.
ADJUSTMENT
Pump discharge (output flow) can be adjusted within the min./
max. ranges as shown in the illustration. The adjustment is
linear. Therefore, positioning the screw midway will produce
one-half of the pump capacity. To adjust the flow, proceed as
follows:
Loosen adjusting screw locknut.1.
Turn the adjusting screw to the desired position and, with 2.
the pump operating, count the drops falling in the sight well
for a one-minute interval.
Tighten adjusting screw locknut.3.
*Should not reciprocate up and down as pump operates, on
pumps built beginning in January 1997.
Calculate Pints Per Day As Follows:
Number of Drops/Min. X 1440 (Minutes in a Day) = Pints/Day
14115 (Number of drops in a Pint)
Calculate Minimum or Maximum Pump
Output Capacity
Input Speed X Pump Output X 1440
Gear Ratio (Min. or Max. (Min./day)
drops/stroke*)
14115 (Number of Drops in a Pint)
* Minimum and Maximum Drops Per Stroke Listed in
Specifications on the next page.
NOTE: For proper sizing select the appropriate
lubricator brand. Brand as well as piston
size will effect minimum and maximum
pump capacity.
The following example is a Manzel lubricator, electric motor driven,
300:1 internal ratio, 1/4" pump model 88. Solve for maximum flow:
1725 Motor Speed X Max. 12 drops X 1440 Min.
300:1 Gear Ratio per stroke
14115 (Number of Drops in a Pint)
To Calculate Minimum: Replace the maximum 12 drops per stroke
with the minimum 2 drops per stroke: (1.17 minimum pints per day)
=
Min. or Max. Pump Output
(Pints Per Day)
=
Max. 7.04
Pints/day