10
11.1.2 Replacing V Belts
If broken, stretched or excessively worn belts require
replacement:
1.
Remove the entire belt guard by removing the 4 bolts
that connect the cover to the pump base (see figure 4,
page 9), and lift the cover straight up.
2.
Loosen the motor’s mounting bolts and slide the
motor
base towards the pump, allowing the belts to loosen.
Remove the belts (see figure 5, page 9).
3.
Confirm use of the proper replacement belts (see parts
list, page 8) and install them carefully onto each sheave
pulley. All belts must be replaced as a set; never indi-
vidually.
4.
Re-tension the belts with the sliding motor base ac-
cording to the chart (figure 6, see page 9). Note that
new belts require greater initial tension than belts that
have been in operation. Double check the belt tension
while tightening the motor base and assure the motor
stays in alignment while re-tightening
(see figure 5, page 9).
5.
Re-attach the belt guard ensuring the four mounting
bolts are tight and locking washers are in place.
Confirm that no part of the belt guard comes in con-
tact with rotating sheaves or belts.
6.
Reinstall the outside panel of the guard. All 4 bolts
must be installed for safety. Never operate the pump
without the belt guard firmly installed.
11.2 Special Note: Sheave Re-installation
In the event a new blower is fitted to your VPDB vacuum
pump assembly, it is important to assure proper place-
ment of the sheave on the pump’s drive shaft. If not,
11.3 Cleaning Air-Filter
For your convenience the VPDB is equipped with a filter
cartridge enclosed in a ClearVu cannister which allows
you to know exactly when you need to clean or replace
the filter element.
Filter Element in ClearVu Canister
misalignment and unacceptable “overhang”
can occur,
prematurely wearing the seals and bearings of the pump.
Position of Sheave Pulley on VPDB Pump Drive Shaft:
CRITICAL NOTE:
On 3 and 5 Hp units:
the bushing must be 1/32” –
1/16”
from the blower face. This will result in a 5/16” between
the blower face and the sheave.
Release clamps to remove
ClearVu cannister.
Pull cannister straight down
and empty any dust.
11.4 Removing Sound Curtains
Pull filter straight down
to clean or replace.
On the 10 through 15 Hp units:
the bushing is held with-
in the sheave. There should be ¼” between the blower
face and the sheave.
On the 20 Hp units:
Position of Sheave Pulley on Pump
Drive Shaft: The distance between the blower face and
the installed pulley face must not exceed
0.38”.
If you have the optional sound curtain kit, panels can
easily be removed for access to perform maintenance.
