12
| Defender 500
www.natvac.com | 800.253.5500
Ordinary maintenance
• Re-fill the lubrication oil tank periodically
• Check that the drive protections are properly fixed
• Clean the filters of the injection valves (ballast ports)
Checking Vane Wear
• We recommend checking vane wear at least every 12 months�
• A new vane is flush with the outside diameter of the rotor.
• Unscrew the plug (fig. 3) and insert a rod of dia. 1/4” and turn the
shaft by hand� With the checking rod touching the outside diam-
eter of the rotor, mark it a first time with a scribe. Continue turning
the shaft until the checking rod falls inside a vane groove touching
the vane� Mark the rod a second time� If the distance between
the two marks exceeds 3/16” the vanes must be replaced� Once
finished the checking procedure replace the plug of (fig. 3).
• Vanes should be replaced in sets and it is always a good idea to
have an extra set of vanes on hand for emergencies�
Figure 3
Maintenance _____________________________________________________
108-500-D
CLOCKWISE SHOWN
SCALE 1 / 4
SECTION F-F
SCALE 1 / 2
SECTION G-G
SCALE 1 / 2
108-500-S
CCW SHOWN
SCALE 1 / 4
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
A
A
B
B
C
C
D
D
NVE
National
Vacuum
Equipment, Inc.
2670 Aero Park Drive, Traverse City, MI 49686
Phone: (231) 941-0215 Fax: (231) 941-2354
TOLERANCES UNLESS OTHER WISE SPECIFIED
One place (.X) ±.1
Two places (.XX) ±.01
Three places (.XXX) ±.005
Angles ±1°
All machined surfaces 125 RMS max.
Remove all burrs and sharp edges.
CAD drawing - NO manual changes.
All dimensions in inches unless specified.
This document may contain confidential trade
secret information which is the exclusive
property of National Vacuum Equipment. Any
information on this drawing is not to be
disclosed to anyone not having a "Need to
Know." The information contained herein is to
be used only in accordance with the best
interests of National Vacuum Equipment.
PART NAME:
MATERIAL:
DRAWN BY:
SCALE:
CHECKED BY:
DATE:
BOB
PART NO.
SHEET
2
108-500-D OR S
2
of
SEE BOM
APPROX. WT.
CAD FILE LOCATION: P:\Data\CAD - Production\108-500-D OR S.idw
SHEET SIZE
D
DEFENDER 500, CW OR CCW
F
F
G
G
(6.890)
(9.815)
(4.908)
(.752)
(11.170)
(11.417)
(5.275)
(31.617)
(8.751)
(
3.000)
(3.150)
(16.879)
(8.195)
(21.726)
(
1.499)
(
1.375)
(1.289)
(.375) SQ
(.3125) SQ
(1.201)
13.000
REVISION HISTORY
REV
DATE
DESCRIPTION
APPROVED ZONE
A
4/27/10
COMPLETE REDESIGN OF
ASSEMBLY
ECN 1126
-
B
6/9/2010
ITEM 22 802-063-500 WAS
120-063-500, CORRECT
OILPUMP
ECN 1132
C2
Vanes wear
control plug
