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The torque arm end must not be rigidly attached to steel framework. The bracket or stirrup of the end of the torque arm must provide clearance to permit the Anti Runback to center itself in axial and angular positions to prevent pincing of bearings and damage or failure of unit, and must be sufficient for "L" loads above and below torque arm for Anti Runback size selected. The preferred position is horizontal to reduce bearing loading for longer bearing life. Refer to certified drawings and instruction bulletins furnished with each other.
Cover plate
Gasket
Ball Bearing
Oil Seal
Outer Race
Sprag Cage
Pin & Cotter Keys
Torque Arm
Stop Lug
Doublelip Seal er
Outer Labyrinth
11
10
1
2
5
6
3
4
k
Clearance
dia
Bore
H
C
Pull-of
Holes
Holes
38.1 mm -63 mm
Clearance on all units
Clearance on all units
24.5mm
Clearance on all units
Clearance on all units
38.1 mm
Clearance for
actual positioning
actual positioning
38.1 mm
Breather
Filter
Filter
Oil fill
Fitting
Fitting
9
See note 14
Grease Relief Fittings
J
B
Stirrip for end of Torque arm
By Customer.
Make brackets above and
Below Torque Arm
Sufficient for “L” Loads
By Customer.
Make brackets above and
Below Torque Arm
Sufficient for “L” Loads
Oil Level
Indicator
Indicator
G
A
E
6.35 mm
Min Clearance
To Permit
Backstop to center
Itself when
freewheeling
To Permit
Backstop to center
Itself when
freewheeling
See note 14
D
7
8
VAR3SC |
3818 |
7637 |
300 |
510 |
75 |
20 x 4.9 |
46 |
VAR6SC |
7600 |
15200 |
250 |
920 |
95 |
25 x 5.4 |
69 |
VAR12SC |
15000 |
30000 |
210 |
1325 |
120 |
32 x 7.4 |
100 |
VAR18SC |
25500 |
51000 |
180 |
1776 |
140 |
36 x 8.4 |
152 |
VAR27SC |
39000 |
78000 |
150 |
2259 |
165 |
40 x 9.4 |
207 |
VAR63SC |
44500 |
89000 |
120 |
4452 |
205 |
50 x 11.4 |
381 |
VAR90SC |
77800 |
155600 |
105 |
6072 |
240 |
56 x 12.4 |
520 |
VAR135SC |
81500 |
163000 |
90 |
8464 |
265 |
63 x 12.4 |
690 |
VAR186SC |
142625 |
285250 |
80 |
10580 |
300 |
70 x 14.4 |
966 |
Max Torque
NM
Max
RPM
Load
“L”
Kgs
Max
Bore
mm
Max bore
Key way
mm
Nominal Torque
NM
Backstop
Size
Ship weight
kg's
VAR3SC |
210 |
143 |
105 |
64 |
76 |
133 |
813 |
119 |
105 |
88 |
VAR6SC |
248 |
165 |
127 |
70 |
102 |
159 |
914 |
143 |
124 |
108 |
VAR12SC |
292 |
203 |
133 |
83 |
127 |
165 |
1270 |
149 |
146 |
133 |
VAR18SC |
343 |
235 |
148 |
92 |
152 |
179 |
1422 |
164 |
168 |
162 |
VAR27SC |
384 |
254 |
178 |
98 |
178 |
213 |
1676 |
195 |
191 |
181 |
VAR63SC |
498 |
311 |
203 |
127 |
254 |
238 |
1981 |
221 |
244 |
241 |
VAR90SC |
584 |
362 |
229 |
140 |
305 |
267 |
2083 |
248 |
270 |
270 |
VAR135SC |
654 |
406 |
254 |
143 |
381 |
298 |
2235 |
276 |
308 |
324 |
VAR180SC |
774 |
419 |
273 |
159 |
457 |
321 |
2388 |
297 |
349 |
362 |
Backstop
Size
A
mm
J
mm
H
mm
G
mm
F
mm
E
mm
D
mm
C
mm
B
mm
K
mm
The holdback oil must be drained and flushed out, preferably whilst unit is operating, to flush properly. |
The holdback must be refilled with an oil viscosity grade of 100. |
The grease dust plug must be removed and all the old grease must be pumped out to remove the dust from the system. |
Do not pump any grease in unless the plugs are removed it will cause holdback failure. |
Oil samples must be analyzed to check for material particles. |
Damaged grease nipples must be replaced |
Damaged pipe leaks must be sealed or replaced. |
The inspection must be completed like the weekly inspection and then be serviced as follows
Check all pipe work |
If leaking - repair |
Check oil level sight glass |
If cracked - replace |
Check breather |
If elements is blocked - replace. If cover is damaged - replace. |
Check oil level |
If low-top up |
Check torque arm pins |
If split pins are missing - Fit new split pins |
Check holdback temperature |
If more that the ambient temp. Plus 200 degrees call.Quesco for assistance (930 C Max with ambient of 520 C) |
Check vibration sensor |
If any vibration other that the installation vibration is present callQuesco immediately to assist you. |
Check The torque arm support stirrup |
If loose, or any bolts missing replace or repair immediately, the torque arm sideclearance must not be less that 25 mm both sides of the torque arm. |
Check grease in purging cavity |
Pump grease in at every inspection, this is only to keep the dust out(Remove the dust plug before pumping the grease in) any EP 2 or normalGrease can be used. |
NOTE:
A Backstop be mounted for desired rotation. Arrow on inner race indicates direction of free shaft rotation.
Before mounting on shaft, be sure to check direction of free rotation.
NOTE
N Seals are factory packed with grease.
Before placing in operation, backstop must be filled internally with recommended oil.
Weekly Inspection
3Monthly Inspection and Service
Engineering Data
Dimensions and Data
Anti-Runbacks
