User's Manual

ManualsBrandsGraco ManualsAutomatic Lubrication SystemsGraco Manzel Model 88 Pumps

DESCRIPTION

The Model 88 Pump is a heavy-duty precision metering pump

capable of accurately pumping small ﬂows of either mineral or

synthetic oil to machinery injection points. The single-piston

pump is mechanically driven from a camshaft in the reservoir

and is adjustable from 1 to 27 drops per stroke, depending on

the piston size. The pump can develop pressures up to 7500

psi, depending on the piston size. All working parts are totally

enclosed away from dirt, water, and impurities and self-lubricated

at all times by the ﬂuid in the reservoir.

Model 88 Pumps are designed for use in Manzel

Model 55 and

76 Box Lubricators, and in Mega, Lincoln and Premier Model 55

Box Lubricators. The output ranges vary slightly depending on the

lubricator.

Model 88 Pumps are rugged, heavy duty units. Each pump

includes a precision machined steel sleeve ﬁtted with an alloy

steel piston.

The pump is actuated by a hardened steel roller - rocker following

a cam for low wear and longer life. The visual sight well is one-

piece injection molded material that is impervious to ultra-violet

rays, and mineral and synthetic oils.

Three (3) piston sizes are available to produce outputs up to 27

drops per stroke in Manzel Box Lubricators and up to 20 drops per

stroke in Mega, Lincoln and Premier Model 55 Box Lubricators.

FEATURES/BENEFITS

Rugged construction for high performance and durability•

Suction and gravity/pressure feed models for application •

ﬂexibility

Pump output is easily adjustable•

Hardened cam roller adds to pump and cam life•

One piece sight glass means fewer leak path and seal •

points

OPERATION

Pumps With Vacuum Feed

(Sight Glass Type)

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 supply inlet shutoff

ball is concurrently unseated and lubricant is drawn into the piston

cylinder from the sight well. This action creates a pressure reduction

(vacuum) in the air- tight sight well, causing lubricant from the

reservoir to be drawn into the well until pressure is equalized. 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.

The number of drops seen falling in the sight well equals the amount

of oil discharged by the pump. 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.

Manzel

Model 88 Pump

Summary of content (4 pages)

PAGE 1
Manzel Model 88 Pump ® DESCRIPTION The Model 88 Pump is a heavy-duty precision metering pump capable of accurately pumping small flows of either mineral or synthetic oil to machinery injection points. The single-piston pump is mechanically driven from a camshaft in the reservoir and is adjustable from 1 to 27 drops per stroke, depending on the piston size. The pump can develop pressures up to 7500 psi, depending on the piston size.
PAGE 2
L51025 Manzel ® Model 88 Pump 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.
PAGE 3
L51025 Manzel ® Model 88 Pump Specifications Piston Dia (inches) Max Pressure 3 (psi) Max Min Max Min Max Min Max Min In Manzel Lubricator (55 and 76) 88B, F, J 3/16 7500 6 1 0.013 0.002 0.213 0.033 50 3 88C, G, K 1/4 6000 12 2 0.024 0.004 0.393 0.066 50 3 88E, H, L 3/8 2500 27 4 0.055 0.004 0.901 0.131 50 3 In Mega, Lincoln or Premier Lubricators 88B, F, J 3/16 7500 5 1 0.009 0.002 0.148 0.033 50 3 88C, G, K 1/4 6000 9 2 0.018 0.004 0.295 0.
PAGE 4
MANZEL MODEL 88 PUMP OPERATING INSTRUCTIONS 1. Fill the box lubricator reservoir, to the top of the sight level gauge, with oil, filtered through a 25 micron nominal strainer. (Machine requirements may dictate a higher oil cleanliness level.) 2. Expel all air from the pump. NOTE: Do not connect the oil line to the pump outlet or lube point until all air has been expelled. To Expel Air From The Pump: a. Remove the sight well plug. b. Fill the sight well to the top with filtered oil. c.