Just Better Keeping the life of your pump - Manual (Page 2)

IMPORTANT
JB PUMPS ARE NOT TO BE USED ON AMMONIA OR LITHIUM BROMIDE
(salt water) SYSTEMS. Pump maintenance is the responsibility of the owner.
Cleaning and Testing Your Vacuum Pump
One of the easiest ways to spot if your pump is
in need of a good cleaning is to look at the sight
glass. If the oil looks milky, rusty, or full of
debris, then the inside of the pump is in worse
shape (Figure 1).
To clean, start the vacuum pump and allow
it to run for about 15 minutes to warm up the
oil. Make sure that you have allowed enough
working room to safely drain and capture the oil.
After the oil has stopped dripping, tilt the pump
forward to remove any remaining excess oil (Fig-
ure 2). Then, stand the pump on the nose of the
cover (Figure 3) to allow any trapped oil in the
wells and stators to drain. Let sit for a few min-
utes and return the pump to its normal running
position. Repeat tilting forward. Close drain
valve. Dispose of contaminated oil properly.
Once the oil has been completely removed,
return the pump to the position in fi gure 3 and
remove either the 2 rubber feet from the bottom
of the pump or remove pump base (depends on
the age of the pump which option is available).
Next, turn the pump on to the motor end (Figure
4) and remove the 6 socket head cover screws
holding the cover in place (Figure 5). Remove
the cover from the pump and wipe the inside
surface with a dry, clean rag. The sight glass
is more diffi cult to clean. Try pouring in some
solvent and using a pipe cleaner.
Figur
e 1
Figur
e 2
Figur
e 3
Figur
e 4
Figur
e 5
Remember to change the oil. JB recommends
changing oil after every evacuation and for larger
jobs, you may need to change the oil a few times.
Hydrofl ouric and hydrochloric acids and moisture
collect in the oil. Left sitting in a pump, they act
as an abrasive on internal surfaces, rusting and
corroding them.
Next, remove the oil defl ector which is held in
place with a socket head screw (Figure 6). Wipe
with a clean, dry rag. If needed, a wire brush can
be used to clean any discoloration to metal parts
(this will not affect the pump’s performance once
the cleaning is complete). Remove the cover seal
and clean cover seal (Figure 7). Wipe the outside
of the cartridge’s surfaces with a clean, dry rag. A
wire brush can be used on all surfaces including
the exhaust valve and the intake relief valve. If
they are discolored, they will still perform fi ne.
DO NOT DISTURB THE FOUR CARTRIDGE
BOLTS OR THE TWO SMALLER HEX
HEAD SCREWS (FIGURE 8). These are the
setting screws.
If the intake relief valve set or the exhaust valve
set is damaged and needs replacing, these items
can be ordered through your local wholesaler
under JB Part Number PR-18. It is best to replace
after completing the cleaning of the cartridge. Pay
attention to the order in which they are assembled
for correct reinstallation.
Reassemble the oil defl ector (Figure 6). Clean out
the channel for the cover seal with a clean, dry rag
and smear some grease into the channel. This will
help hold the cover seal in place for reinstallation
of the cover. If the cover seal seems a little tight,
stretch the seal a little and try again. All seals
in JB pumps are designed to be reused. Reset
the cover in place and replace the cover screws.
Tighten in a crisscross pattern. Reattach feet or
base.
Next, return the pump to its normal running posi-
tion and place where you drained the oil. Open
the drain valve, the 3/8” port on the intake, and the
isolation valve. Have 1/3 cup of clean oil ready.
Start the pump and pour the clean oil into the
intake port. Let the pump run for 5 to 6 seconds
and then shut the pump off. Drain the oil, tipping
the pump forward as in Figure 2 to completely
drain. Close the drain valve and dispose of spent
oil properly after the fl ushing is complete.
Figure 6
Figure 7
Figure 8
DO NOT
DISTURB THESE
2 3