Zenith B Spécifications télécharger pdf (Page 9)

Inspection

and Part

Preparation

After the parts have been cleaned,

they should be inspected for nicks,

burrs and stubborn residue. The gears

and the edges of the gear plate pockets

are the most likely areas to be damaged

because of sharp edges. An illuminated

magnifier facilitates examination.

1. All flat surfaces of plates and gears

should be “blocked”. Blocking is the

act of rubbing the flat surface of a part

on 400-grit, 500-grit or 3/0 abrasive

paper, which is supported on a

machinist’s or inspector’s surface

plate. A few light but firm rubs usually

are enough to remove residue and

minor metal disturbances. Remember

to use a figure 8 pattern to retain flat-

ness and perpendicularity of holes

when lapping plates.

1. Heavy disturbances or residue on

front or rear plates (NOT the gear

plate!) may require stronger blocking

on 320-grit or even 240-grit abrasive

paper followed by blocking on a finer

abrasive paper. Deep score marks or

metal transfer cannot be removed by

blocking, and the surfaces must be

ground. When surfaces are ground,

care must be taken to maintain the

perpendicularity of the precision

ground holes with the inner plate sur-

face. The gear plate should never be

ground; to do so would reduce the

axial gear clearance to the point

where interference might occur when

the pump is reassembled. Gears can

be ground as well, but interchange-

ability and clearances are altered.

Grinding gears is NOT recommended!

2. Gears, shafts and arbors should be

lightly polished on the O.D.

3. Any nicks in the gear teeth should be

removed by carefully stoning the

parts with a fine India oilstone or an

Arkansas stone.

4. The edges of the gear’s I.D., bearing

holes and dowel holes should be

lightly stoned with a round Arkansas

stone to remove any nicks. Then polish

the I.D. with a small piece of fine

abrasive paper, 400-grit or finer.

5. After all preparation has been com-

pleted, remove the abrasive grain

and loose residue in an ultrasonic

cleaner or other suitable cleaning

method. Abrasive grain is larger in

size than the pump clearances.

6. At this point, dimensional inspection

may be made if desired.

B-9000 Series

Disassembly

(continued)

the adapter plate to the pump

body. Lift the adapter plate off the

pump body and retrieve the O-

Ring.

4. Loosen and remove the socket head

screws (19) and (20) from the back

of the rear plate (7).

5. Remove the rear plate (7). Always

use the pry slots to prevent scratching

precision tapped surfaces.

6. Remove the gear plate (3), being

careful to note the alignment of any

markings on the plate. Always use

the pry slots to prevent scratching

the plates.

Caution: Do not allow metering gears to

be lifted out with the gear plate. They

may drop, causing damage to the gear

teeth. Note that the slip-fit dowels (10)

may come off with the gear plate.

7. Remove the retaining ring (16) from

the shaft (2) which holds the driving

gear (5) in place.

8. Remove the driving gear (5).

9. Remove the round key (4).

10. Remove the drive shaft (2) from the

front plate (8).

11. Remove the driven gear (6) from the

arbor (9).

12. Remove the slip-fit dowels (10) by

turning and pulling simultaneously.

13. If the arbor (9) is to be replaced or

thoroughly checked, press out by

using an arbor press, pressing

toward the inside of the pump (the

shortest press distance).

14. Replace sleeve bearings (32 & 34)

in front and rear plates as necessary

and hone in the plate to the original

new part specifications. Contact

Zenith for dimensions. NOTE: .05

through 2.4 cc/rev models do not

have sleeve bearings.

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Zenith B Spécifications Page 9

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