
14 · GLOBE AIRMOTORS MANUAL | VA2J&X | VS2C | VA2C | ATEX certified
Rebuild instructions
Vane motor maintenance instructions
These motors are made to precise tolerances and itisvital for
efficientoperation to achive minimum clearances throughout.
Every clearance represents an airleakage path from inlet to
exhaust, which will detract from the starting and running
characteristics.
The spacing of the rotor is of prime importance intwo ways:
1- rotor toend covers (sideclearance) (Cs)
nominally 0.050 mm (0.002")
2- rotor tobody casing (topclearance) (Ct)
nominally 0.050 mm (0.002")
To achieve the side clearance each repair kit has a series of
plastic shims, colour coded todifferent thicknesses.
Purple = 0.025 mm (0.001")
Blue = 0.050mm (0.002")
Green = 0.076 mm (0.003")
Orange orBrown = 0.102 mm (0.004")
This range of vane motors has three styles of rotor locations.
V1 rotor location bysingle row bearing at eachend.
V2 - V4rotor location byone double row bearing inrear cover.
V6 - V8- V10 rotor location byone double row bearing infront
cover.
Assembly details
ll parts mustbe clean and itis recommended that new
oilsealsand blades are fitted as a matter of course.
Pressallbearings fully home into theirrespective covers,
pressing only on the outer trackto preventdamaging the
bearings.
On V1, V2, V4 motors fit
oilseal retaining circlip
anda new oilseal. Cs
Rotor/ Shaft Assy
Ejection ring
Rear cover
Bearing
Bearing
support
V1 Motor
Cs
Rotor / Shaft Assy
Ejection ring
Rear cover
Bearing
Bearing support
V2 - V4 Motor
Cs
Rotor / Shaft Assy
Ejection ring
Front cover Bearing
Bearing support
V6 - V8 - V10 Motor
Take the location cover for your particular motori.e. V2 - V4
rear cover,V6- V8- V10 frontcover andrear screwed cover for
V1 unit.
Provide a good support on the inner bearing track, as the shaft
fit is very tight, to provide rotor location.
Place blade ejector ring central on cover andpressrotor /
shaftassembly down until there isa clearance, Csof 0.050
mm (0.002") betweenrotor andcover, checkthis clearance is
even allaround the rotor.
Fit a blue plastic body gasket to the cover, lowering thebody
into positionover therotor assembly, locating on the existing
dowels.
NOTE: Ensure the body is the correct way round i.e. port
arrows towards the output shaft.
Ct
Fig. 4
Tighten body boltsand check top
clearance, Ct, see Fig No. 4This
should be 0.050 mm(0.002") if
there isa problem with this then
then reposition and drill for new
dowels. Insert second ejection
ring, fit newblades, it may be
neccessary towork the lower
ejection ring across inorder tofit
the opposite blade.
Ct
Fig. 5
Refer to Fig No. 5 (axial end
clerance, Cs). Measure this by
putting a straight edge across
the body, then use feeler gauges
in thegapbetween rotor and
body face. This should bemade
up to0.050 mm(0.002") or as
close as possible using the
gasket set provided.
Oil inside themotor, ensuring itis free to rotate. OnV2to V10
motors thesecond cover should slide down into position
easily as the second bearing fit is non locating.
Fig. 6
On V1 motors (see Fig No. 6) this
bearing fit takesup locationand
theinner track ofboth the lower
and upperbearings must be
supported.
Locate cover ondowels and tighten bolts. (V1 fit rear plug).
Check for rotation. The motormaybetight at first due to
hydraulic lock on the oil just used.
On V1 motors only fit front oilseal and circlip ifthe motoris free
to rotate.
V6, V8, V10 motors - thefront oilseal iscarried in a separate
housing, this should be fitted next, followed by the rear bearing
cover and its gasket.
V2, V4 motors - the rear bearing cover and ists 'O' ring can
now be fitted.
For troublefree running and long life it is vital that the rotor spacing is correct.
Use only genuine replacement blades as these have a special profile togive correct ejection and contact with the rotor body.
lwaysensure adequate lubrication.
Never run motors completely off load at high speed.