Gardner Denver Thomas GmbH
Livry-Gargan-Str. 10
82256 Fürstenfeldbruck / Germany
17000811-08-04 Stand: 30.03.2016 sapf
8/10
Air filtration (B 1):
The performance of the vacuum pump will reduce if the air filter is not maintained correctly.
The filter cartridge (8) should be cleaner by blowing air through the inlet to the outside of the cartridge, or if necessary
replaced. A replacement of the filter is recommended at least once per year (or under extreme conditions more often).
Filter cartridge change: Unscrew housing cover (7). Remove filter cartridge (8) and gaskets (9, 10) from filter chamber.
Clean or replace filter cartridge (8) and check the condition of the gaskets (9, 10). Reassembly is in the opposite direction.
Insert filter cartridge (8) with the closed end towards the housing cover (7). Pay attention that the gasket 9 is not confused
with gasket 10 (which is thicker). Replace housing cover (7) and ensure the surface of both the rotor (13) and housing
(12) are clean. Tighten the screws (17) to 5,5Nm +0,5Nm.
Vanes (B 1 / B 2):
The VTE pump has four graphite vanes (11), which have a low but permanent wear rate. The wear rate will be increased
if the inlet air is contaminated. For pumping clean air the vanes should be check at the latest after 4000 running hours
and thereafter every 1000 hours. For other conditions, depending upon the application, the service interval should be
reduced.
Checking the vanes: Remove the housing cover (7) from the housing. Remove the vane (11) to be checked. All vanes
should have a minimum height (X) of 10mm (for VTE 3 and VTE 6) or 12mm (for VTE 8 and VTE 10). If the minimum
height is reached then all four vanes should be replaced.
The vanes should only be replaced as a complete set.
Replacing the vanes: Clean housing (12) and rotor slots (13) with compressed air.
Insert the vanes (11) in the rotor slots ensuring that the angled end of the vane (Y) is
on the outside and in the direction of rotation (O1) along the bore of the housing (Z).
Replace the housing cover (7) and lightly tighten. Start the pump briefly and check
for the free and smooth running of the vanes. Tighten the housing cover screws (17)
to 5,5Nm +0,5Nm.
Fault Finding:
Problem (P), Cause and Solution (S):
P Vacuum pump switches off due to activation of the motor protection switch.
S Voltage or frequency of supply does not correspond to the motor nameplate
Æ
ensure correct power supply
S Pump seized
Æ
Check if vanes are broken, otherwise contact local service centre
S Incorrect lead connection in terminal box
Æ
Check connections are according to diagram
S The back pressure of the motor fan is too high
Æ
Ensure sufficient cool ventilation
S The motor protection switch is not set correctly
Æ
Ensure settings are according the data onto motor nameplate
S Automatic cut-out activates too quickly
Æ
Use cut-out with time delay
P In sufficient vacuum flow:
S Inlet filter is blocked
Æ
Clean or replace the inlet filter
S Inlet or outlet pipe is too long or too restrictive
Æ
Reduce length or increase diameter of pipe
S Leakage in pump or in system
Æ
Check / tighten fittings and pipes
S Worn or damaged vanes
Æ
Check vanes and replace if necessary
P Max. vacuum not reached:
S Leakage in pump or in system
Æ
Check / tighten fittings and pipes
S Worn or damaged vanes
Æ
Check vanes and replace if necessary
P Thermal switch activates
Æ
Vacuum pump is too hot:
S Temperature of the ambient air or inlet air too high
Æ
Reduced temperature of cooling or inlet air
S Pump is over loaded or set up incorrectly
Æ
contact local service centre
S Cooling air restricted
Æ
ensure sufficient cooling air
P Vacuum pump emits unusual noise:
S Pump housing is worn
Æ
Return pump to manufacturer or local service centre
S Vacuum regulation valve (if fitted) is noisy
Æ
Replace valve
S Vanes are worn or damaged
Æ
Check vanes and replace if necessary
B 2
