Viking Pump TSM144: GG-AL 495/4195 - Manual (Page 7)

SECTION TSM 144 ISSUE H PAGE 7 OF 10
ASSEMBLY
Standard Mechanical Seal
(Synthetic Rubber Bellows Type)
Clean all parts thoroughly and examine for wear or damage.
Check the lip seals, ball bearings, bushing and idler pin and
replace if necessary. Check all other parts for nicks, burrs,
excessive wear and replace if necessary.
Check the bearings for roughness. Roughness can be
determined by turning the outer race by hand. Replace the
bearings if they have roughness.
Be sure the shaft is free from nicks, burrs and foreign
particles that might damage the mechanical seal. Scratches
on the shaft in seal area will provide leakage paths under the
mechanical seal. Use a fine emery cloth to remove scratches
or sharp edges.
READ CAREFULLY BEFORE REASSEMBLING PUMP
The seal used in this pump is simple to install and good
performance will result if care is taken during installation.
The principle of a mechanical seal is contact between the
rotary and stationary members. These parts are lapped to
a high finish and their sealing effectiveness depends on
complete contact.
Prior to installing the rotary portion of the mechanical
seal, prepare and organize the rotor shaft, head and idler
assemblies and appropriate gaskets for quick assembly.
Once the rotary portion of the mechanical seal is installed
on the rotor shaft, it is necessary to assemble the parts as
quickly as possible to insure the seal does not stick to the
shaft in the wrong axial position. The seat will stick to the
shaft after several minutes setting time.
Never touch the sealing faces with anything except clean
hands or clean cloth. Minute particles can scratch the seal
faces and cause leakage.
1. Coat the idler pin with non-detergent SAE 30 weight
oil and place idler and bushing on idler pin in the
head. If replacing a carbon graphite bushing, refer to
“Installation of Carbon Graphite Bushings,” page 8.
2. Clean the rotor hub and casing seal housing bore. Make
sure both are free from dirt and grit. Coat the outer
diameter of seal seat and inner diameter of seal housing
bore with non-detergent SAE 30 weight oil.
3. Start the seal seat in the seal housing bore. If force is
necessary protect the seal face with a clean cardboard
disc and gently tap it in place with a piece of wood. Be
sure the seal seat is completely seated in the bore.
4. Place a tapered installation sleeve on the shaft, refer to
Figure 11. The sleeve is furnished with G, GG, AS, AK
and AL replacement mechanical seals. Coat the rotor
shaft, tapered installation sleeve and inner diameter of
the mechanical seal rotary member with a generous
amount of non-detergent SAE 30 weight oil. Petrolatum
may be used but grease is not recommended.
5. Place the seal spring on the shaft against the rotor hub.
Refer to Figure 12.
6. Slide the rotary member, lapped contact surface facing
away from the spring, over installation sleeve on shaft
until just contacting the spring. Do not compress the
spring. Remove the installation sleeve.
7. Coat the rotor shaft with non-detergent SAE 30 weight
oil. Install the rotor and shaft into the casing, slowly
pushing until the ends of the rotor teeth are just below
the face of the casing. Take care not to damage the seal
seat.
8. Leave the rotor in this position. Withdrawal of the rotor
and shaft may displace the carbon seal rotating face and
result in damage to the seal.
9. Place the O-ring or gasket on the head and install the
head and idler assembly on pump. The pump head
and casing were marked before disassembly to insure
proper reassembly. If not, be sure the idler pin, which
is offset in the pump head, is positioned up and equal
distance between port connections to allow for proper
flow of liquid through the pump.
10. Tighten the head capscrews evenly.
11. If the pump was equipped with a relief valve and was
removed during disassembly, install on the head with
new O-Rings or gaskets. The relief valve adjusting screw
cap must always point towards the suction port. Refer to
Figure 5, page 3. For relief valve repair or adjustments,
see “Pressure Relief Valve Instructions,” Page 9.
12. In 2005, the use of single seal bearings were phased
out. Pumps now use “Sealed for Life” bearings that
have seals on both sides. The new bearings can be
installed either side first and do not need to be packed
with grease. For older models with single seal bearings,
pack the inner ball bearing with multi-purpose grease,
NLGI #2.
FIGURE 11
SPRING
MECHANICAL SEAL
(ROTARY MEMBER)
TAPERED SLEEVE
COAT WITH LIGHT OIL BEFORE ASSEMBLY
MECHANICAL SEAL
(ROTARY MEMBER)
SPRING
ROTOR HUB
SHAFT
FIGURE 12