WPG N4300 Series Operating instructions

WOOD'S POWR-GRIP
®
GUIDE TO MAINTENANCE,
TROUBLESHOOTING AND REPAIR
THE ORIGINAL
& TRUSTED NAME
IN VACUUM LIFTING
EQUIPMENT
Wood's Powr-Grip products are sold
through authorized dealers.
800.548.7341
WPG.com
908 West Main - P.O. Box 368
Laurel, Montana 59044 U.S.A.
406.628.8231 (phone)
406.628.8354 (fax)
Rev. 4.6/ 10-21 Metal Troubleshooter 1MTS
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consult the product instructions on www.WPG.com or contact a Technical Sales Representative for more information.
General Maintenance
Inspect the Hand Cup Regularly:
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 ([DPLQHWKHSOXQJHUDVVHPEO\DQGKDQGOHIRUGHQWVFUDFNVRURWKHUGDPDJH
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• Examine the vacuum pad for cuts or roughness on the sealing edges (see Inspect the Sealing Edges below).
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in plunger action or radical changes in the number of strokes needed to keep the red line hidden.
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determine which corrective action is needed.
Clean the Vacuum Pad:
 5HPRYHWKHDLU¿OWHUIURPWKHSDGIDFH
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• Never use solvents or rubber conditioners as a cleaning agentVHH:$51,1*6
• To prevent liquid from contaminating the pump during cleaning, hold the cup facedown
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• If the pad has a felt strip at the edge, be careful not to dampen it.
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 5HLQVWDOOWKHDLU¿OWHU
Inspecting and Testing the Cup for Leakage
Inspect the Sealing Edges:
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foreign material.
 ([DPLQHWKHVHDOLQJHGJHVIRUFXWVE\EHQGLQJWKHHGJHRIWKHSDGIDFHWRZDUGV\RXWRFUHDWH
 DKXPSWXUQLQJWKHKDQGFXSDVQHFHVVDU\
• If cuts or cracks are present in a sealing edge, a V-shaped gap will appear.
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Leak-Test the Hand Cup:
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• The red line on the plunger serves as a vacuum indicator:
 ƒ,IWKHUHGOLQHdoes not appear during the test period, the cup is usable.
 ƒ,IWKHUHGOLQHdoes appear, perform general maintenance and repeat the test.
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causes and appropriate corrective actions.
• If these measures do not restore the cup to normal performance, contact the Wood's Powr-Grip
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32620
N4950, N5450, N6450,
N4300*, N5300*, N6300*
N4950TS, N5450CS
Metal Handle Hand Cups
6RPHGHWDLOVPD\QRWDSSO\WRKDQG
cups with plastic plunger assemblies.

TROUBLESHOOTING GUIDE
PROBLEM CAUSE CORRECTION
Slow leakage
&XWVRQVHDOLQJHGJH Replace vacuum pad.
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U-cup or button.
'U\SXPS $SSO\DOLJKWFRDWLQJRISOXQJHUOXEHLQVLGHKDQGOH
Scratches inside handle (between mid-
point and closed end) Replace handle.
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valve lever 5HSODFHUHOHDVHYDOYHDVVHPEO\
&RQWDPLQDWHGSDGIDFH &OHDQYDFXXPSDG
Release valve O-ring leakage Tighten valve screws and/or replace O-ring.
Valve stem leakage Adjust stem for better alignment.
Severe leakage
Severe contamination &OHDQSOXQJHUDVVHPEO\DQGLQVLGHRIKDQGOH
Gouges or cuts on sealing edges Replace vacuum pad.
Broken handle or release valve 5HSODFHKDQGOHRUUHOHDVHYDOYHDVVHPEO\
Jammed or sluggish pump
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Obstructed release valve stem 5HPRYHREVWUXFWLRQWKURXJKVXFWLRQLQOHWEHKLQGDLU¿OWHU
Severe contamination &OHDQSOXQJHUDVVHPEO\DQGLQVLGHRIKDQGOH
'HQWHGKDQGOH Replace handle.
Bent plunger 5HSODFHSOXQJHUDVVHPEO\
Pad slips when attached
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&RQWDPLQDWHGSDGIDFH &OHDQYDFXXPSDG
Slick or worn pad face 5HSODFHYDFXXPSDGDWOHDVWRQFHHYHU\\HDUV
More than 10 strokes
needed to apply
$Q\RIWKHDERYH Perform general maintenance.
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Sealing edge not contacting load
surface
Remove handle screws and separate vacuum pad from handle.
'HWHUPLQHZKHWKHUKDQGOHRUSDGLVEHQWDQGUHSODFHDV
appropriate.
PARTS AND ASSEMBLY
1 90510AM +DQGOH
2 90520AM 3OXQJHU$VVHPEO\0HWDO
90154AM 3OXQJHU$VVHPEO\,QGXVWULDO*UDGH3ODVWLF
90524AM 3OXQJHU$VVHPEO\ZLWK$XGLR$ODUP:%3
90158AM 3OXQJHU$VVHPEO\+LJK(OHYDWLRQ
3 49480T 9DFXXP3DG>FP@'LD)ODW/LSSHG93)6/
49478T 9DFXXP3DG>FP@'LD)ODW/LSSHG/RZ0DUNLQJ93)6/
49495T 9DFXXP3DG>FP@'LDIRU,03&ODGGLQJ6XUIDFHV93)6&
49488T 9DFXXP3DG>FP@'LDIRU7H[WXUHG6XUIDFHV*76
49506T 9DFXXP3DG>FP@'LD)ODW*
49520T 9DFXXP3DG>FP@'LD&RQFDYH93&6
49586T 9DFXXP3DG>FP@'LD&RQFDYH*
4 90500 9DOYH%ORFNZLWK5HOHDVH/HYHU*XDUG
5 51506 Valve Guard
 $LU)LOWHU
7 10002 +DQGOH6FUHZV
 &KHFN%DOO
9O-Ring*
10 10008 Valve Screws (2)
11 Red Line
12 Button
 8&XS
 1RW6KRZQ
29335 ´>FP@&DVH*UH\
29334 >FP@&DVH%ODFN
29338 >FP@&DVH%ODFN
29342 >FP@&DVH%ODFN
Plunger Lube*
*Repair Kit #90504

Disassembly Procedures
Assembly Procedures
Remove Plunger Assembly from Handle
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not in the handle.
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Remove Release Valve from Handle
• Remove the 2 screws holding the release valve to the handle.
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$VWKHYDOYHLVUHPRYHGWKHFKHFNEDOOPD\UROORXWEHFDUHIXOQRWWRORVHLW
Remove Handle from Vacuum Pad
• Remove the 6 handle screws, and separate the handle from the pad.
• Wrap a small dowel or rod with a soft, lint-free cloth and wipe the inside of the handle,
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Inspect and Attach Handle to Vacuum Pad
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 ÀDVKOLJKWIRULOOXPLQDWLRQ
ƒScratches between the midpoint and the closed end of the handle can cause leakage.
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ƒMake sure that no lubricant remains inside the handle.
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near the closed end of the handle.
• Align the screw holes and reinstall the handle screws.
Reinstall Release Valve on Handle
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• Make sure the check ball and O-ring are in position, and slide the valve stem into the
pad nipple as shown, keeping the O-ring against the closed end of the handle.
• Place the valve guard over the release valve and align the screw holes in the guard,
valve and handle.
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Reinsert Plunger Assembly into Handle
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(lubricant-free) as possible.
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• Do not use improper lubricants in the handle.
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one strong, swift motion.
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1RZWKHFXSLVDVVHPEOHGDQGUHDG\IRUWHVWLQJ

WARNINGS
Wood’s Powr-Grip has taken great care to produce the most reliable vacuum-operated
handling device available. Nevertheless, mistreatment or misuse may damage a hand
cup or otherwise create conditions which could cause the hand cup to fail, resulting
LQDQXQH[SHFWHGUHOHDVH7KHIROORZLQJZDUQLQJVDUHRႇHUHGWRKHOSXVHUVDYRLGPRVW
potential hazards.
Failure to observe WARNINGS could damage
the cup or the load, or cause injury to the user.
• 'RQRWXVHWKHFXSZLWKORDGVWKDWH[FHHGWKHORDGFDSDFLW\
• 'RQRWXVHWKHFXSWRVXSSRUWDSHUVRQ
• 'RQRWSODFHWKHSDGIDFHDJDLQVWVXUIDFHVWKDWFRXOGGDPDJHWKHVHDOLQJHGJHV
• $YRLGFRQGLWLRQVWKDWFRXOGFDXVHWKHFXSWRVOLSRUWRGLVHQJDJHSUHPDWXUHO\VXFK
DVFRQWDPLQDWHVFXWVRUVFUDWFKHVLQWKHSDGIDFHRUORDGVXUIDFHDSSO\LQJWKHFXS
WRSRURXVPDWHULDOVRUDSSO\LQJSUHVVXUHDJDLQVWWKHSDGHGJH
• 'RQRWXVHWKHFXSWROLIWZKHQWKHUHGOLQHLVYLVLEOH,IWKHUHGOLQHUHDSSHDUV 
IUHTXHQWO\GLVFRQWLQXHXVHDQGIROORZWKHLQVWUXFWLRQVIRUJHQHUDOPDLQWHQDQFHDQG
testing.
• 'RQRWDOORZDQ\WKLQJWRLQWHUIHUHZLWKIUHHPRYHPHQWRIWKHSOXQJHUZKLOHWKHFXSLV
attached. This could prevent the red line from warning the user of vacuum loss.
• 'RQRWWRXFKWKHUHOHDVHYDOYHOHYHUZKLOHOLIWLQJ
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and conditioners to clean the cup. See www.WPG.com for more information.