WBV.PU.002.EN VX136Q V2.0
9.9 Reducing the starting torque
The starting torque can be reduced by installing thinner wear plates or by installing shims between lobes and
wear plates.
Please note: increasing the gap between lobes and wear plates reduces the volumetric efficiency.
Increasing the gap by installing thinner wear plates
Gap increase + 1 mm
On gearbox side: Replace the wear plate PFL.B009 (5 mm) with PFL.B009.T1 (4 mm)
On cover side: Replace the wear plate PFL.B002 (4 mm) with PFL.B002.T1 (3 mm)
Gap increase + 0.3 mm
On gearbox side: Replace the wear plate PFL.B009 (5 mm) with PFL.B009.T2 (4.7 mm)
On cover side: Replace the wear plate PFL.B002 (4 mm) with PFL.B002.T2 (3.7 mm)
Increasing the gap by installing shims
Gap increase + 0.2 mm on the Q cover:
Put one new shim 10 x 16 x 0.2 (NUS.062) on each of the four distance nuts of the Q cover.
Gap increase + 0.2 mm on the gearbox:
1. Put one new shim 60 x 75 x 0.2 (NUS.061) on each shaft in front of the first lobe.
2. In addition put one shim (part no. NUS.062) on each of the four distance nuts of the Q cover to adjust
the gap accordingly.
Attention! If more than two shims are placed on each distance nut of the Q cover, a thicker O-ring (part no.
DOR.093) must be placed under the Q cover to maintain reliable sealing.
In case of wear on lobes or plates, the gaps can be reduced again accordingly.
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