Cartridge Mechanical Seal In Gp-414 Pumps; Seal Removal; Seal Installation - Viking pump GP-425 SERIES Technical & Service Manual

20A
5
2
4
3
ITEM NAME OF PART
1
Bracket
2 Bearing Housing Assembly
3
Locknut
4
Lock Washer
5
Set Screws
8 Mechanical Seal
10
Seal Studs
FIGURE 4 – EXPLODED VIEW – MODELS GP-425 CARTRIDGE MECHANICAL SEAL PUMPS
CARTRIDGE MECHANICAL SEAL
IN GP-425 PUMPS

Seal Removal

1. Remove port adaptor on one side of the pump to access
the flow port/gears.
2. Insert brass or plastic bar into one of the pump ports
and into the space between gear teeth to prevent the
driver from spinning. If removing the seal while pump is
installed, lock shaft to prevent spinning. Bend up tang
of lockwasher (Item 4) with flat bladed screw driver or
small flat punch and a hammer. With a spanner wrench,
remove locknut (Item 3) from shaft (Item 12). Remove
lockwasher from shaft.
3. Loosen two set screws in the face of the bearing housing
(Item 2), and turn the bearing housing CCW to remove
the bearing housing assembly from the bracket (Item 1).
4. Remove window guard (not shown) from bracket.
5. If flush plan or barrier fluid tubes are connected to the
seal gland (Item 8), turn off and disconnect before
removing seal. Also, remove all pipe plugs from seal
gland for ease of removal through bearing housing
opening. Place set clips on seal. Loosen the set screws
on the cartridge seal collar to free the cartridge seal
from the shaft. Remove nuts and washers from studs.
Remove all fittings and pipe plugs from seal gland. Slide
cartridge seal out through bearing housing opening.

Seal Installation

TAPERED INSTALLATION SLEEVE
FIGURE 5
SECTION TSM 340.3 ISSUE A
29
1
23A
22
8
10
23
ITEM
11
O-Rings
12 Driver Shaft
13
Driven Shaft
15
Gear Pin (Driven Gear)
15A
Gear Pin (Driver Gear)
17 Alignment Pins
18
Casing
SHAFT
PAGE 6 OF 8
19
15A
11
13
15
9
12
NAME OF PART ITEM
23A
1. NOTE: Burrs left on shaft can damage O-rings on seal
sleeve during installation. Inspect shaft for burrs and
remove any found with a fine grade of emery cloth.
2. Clean driver shaft and face of seal chamber on bracket.
3. Place tapered installation sleeve on shaft. Coat driver
shaft, tapered installation sleeve, and O-rings in the
inside diameter of cartridge seal sleeve with a generous
amount of light oil. See Figure 5.
4. Slide cartridge seal over installation sleeve on shaft until
it contacts the seal chamber face. Be sure the flush port
opening on the seal gland is at the 12 o' clock position.
Remove tapered installation sleeve from shaft.
5. Secure seal gland to bracket face using nuts (Item 22),
Series Torque (ft.-lbs.)
GP-425
TABLE 1 – MECHANICAL SEAL STUD TORQUE SPEC
flat washers (Item 23), and lock washers (Item 23A)
onto studs (Item 10). NOTE: Tighten nuts on studs to
specifications in Table 1.
6. Tighten setscrews on cartridge seal drive collar to shaft
and remove or turn seal centering clips so as to clear the
seal drive collar.
7. Turn shaft by hand to check seal drive collar for runout.
8. Connect flush plan or barrier fluid lines or vent stuffing box,
if no flush plan, until liquid is present in stuffing box. Install
pipe plugs in any remaining port openings in the seal gland.
9. Replace window guard on bracket.
10. Insert brass or plastic bar into one of the pump ports and
into the space between gear teeth to prevent the driver
from spinning.
11. Turn the bearing housing CW to install the bearing
housing assembly to the bracket (Item 1) until flush and
tighten the two set screws in the face of the bearing
housing (item 2).
20
29
11
18
17
NAME OF PART
19
Gear Set
20 Studs
22
Seal Nuts
23
Lock Washers
Flat Washers
29 Head & Bushing Assembly
Torque (N-m)
45 - 50 61 - 68
29