N4000TS,
N4000C
N4950TS,
N4950C
INSTRUCTIONS
Models
N4000TS & N4950TS
N4000C & N4950C
Rev. 0.8 / 07-19 Instruction Sheet 32634
TS
SPECIFICATIONS
Product Description
Hand cups with nominal diameter of 8" [20 cm] use vacuum to lift and carry
loads, as follows: A manual pump removes air from between the rubber
pad and the contact surface; a red line on the pump's plunger serves as a
vacuum indicator; a check valve allows the user to repump the cup without
removing it from the contact surface; and a release mechanism allows the
cup to disengage completely.
Maximum Load Capacity
Models N4000TS & N4950TS: 75 lbs [34 kg] per cup.
Models N4000C & N4950C: 60 lbs [27 kg] per cup.
Maximum Load Capacity includes a 3:1 safety factor and requires the
following: attachment on clean, smooth, nonporous flat surfaces; a minimum
vacuum level of 17½" Hg [-59 kPa]; and a friction coefficient of 1. This rating
is based on tests of new hand cups attached to the upper, horizontal surface
of static objects in ideal conditions. Many factors can reduce the capacity,
including: lifting a load when the cup is attached to a vertical or inclined
surface; or lifting a load that applies leverage to the cup. See www.WPG.com
for more information.
Load Conditions
This hand cup is designed to accommodate loads with either smooth or
textured surfaces; however, extreme surface variation may prevent the
cup from attaching (see OPERATION). The load's contact surface must be
relatively flat (not curved), nonporous, and clean. Moisture or contaminants
can reduce slip resistance
Environmental Conditions
The cup can be used in temperatures from 10° to 120° Fahrenheit [-12° to 49°
Celsius]; however, attaching the cup to irregular surfaces may become more
difficult as temperature decreases, due to decreasing flexibility of the cup face.
In addition, the red-line indicator may not perform reliably at elevations above
5000 feet [1524 meters]; see Service.
OPERATION
To Attach
1) Position the hand cup on the contact surface so the red line will be
visible if it should appear while lifting the load. CAUTION: Test the cup for
staining or deformation of load surfaces with light colors or soft coatings.
2) Press the cup against the load as needed to form a continuous seal
between the sealing edges and the contact surface. CAUTION: Make
sure the load is supported to prevent breakage as force is applied.
3) Pump the plunger until the cup attaches completely. When the red line
is hidden, vacuum is sufficient for lifting. CAUTION: Do not leave the cup
attached to an irregular surface for an extended time, as this might distort
the cup face, making subsequent attachments difficult or impossible.
4) Check the plunger frequently to make sure the cup remains securely
attached. If the red line appears while lifting, set down the load
immediately and pump the plunger until the red line is hidden again (see
WARNINGS).
To Release
1) Set the load on a secure support.
2) Press the valve release lever until the cup disengages completely.
CAUTION: Remove the cup when not in use.
MAINTENANCE
Service
Since aging and wear reduce the capacity of the rubber pad, it should be
replaced at least once every 2 years or whenever damage is discovered (see
Inspection).
If the hand cup does not function normally, the cup face may be dirty or the
cup may require service. First clean the cup face according to the directions
to follow. If the condition persists, contact an authorized dealer or visit
www.WPG.com for assistance.
Cleaning
1) Remove the air filter from the cup face.
2) Use a clean sponge or lint-free cloth to apply soapy water or another
mild cleanser to the cup face; see WARNINGS and www.WPG.com
for more information. CAUTION: To prevent liquid from contaminating
the pump, hold the cup face-down or cover the suction hole in the filter
recess.
3) Wipe all residue from the cup face.
4) Allow the cup to dry and reinstall the air filter.
Inspection
Examine and test the cup regularly to make sure it does not exhibit the
following faults:
• cuts or damage to sealing edges of rubber pad.
• cracks or dents in handle or pump.
• reappearance of red line soon after attaching cup.
• sluggishness or dramatic changes in pump action.
• excessive glaze or stiffness of rubber pad.
• air filter missing from cup face.
Correct any faults before using the cup (see Service).
Storage
Store the cup in clean, dry condition within its protective carrying case.
WARNINGS
Failure to observe WARNINGS could damage the hand cup or the load, or
cause injury to the user.
• Do not use the cup to lift loads that exceed the Maximum Load Capacity
or the effective capacity (see SPECIFICATIONS).
• Do not use the cup to support a person.
• Do not place the cup face against surfaces which could damage the
sealing edges.
• Avoid conditions that could cause the cup to slip or to disengage
prematurely, such as: contaminants, cuts or scratches in the cup face;
applying the cup to dirty or porous materials; or applying pressure
against the cup edge.
• Do not use the cup to lift when the red line is visible. If the red line
reappears frequently, discontinue use and see Service.
• Do not allow anything to interfere with free movement of the plunger
while the cup is attached.
• Do not touch the valve release lever while lifting.
• Do not use harsh chemicals (such as solvents or gasoline)
or unauthorized rubber cleaners and conditioners to clean
the cup.
1. 90510AM Handle, Metal
2. 90520AM Plunger Assembly, Metal
3. 49488T
Vacuum Pad, 8" [20 cm] Dia., Textured Surface (G0695TS)
49495T
Vacuum Pad, 8" [20 cm] Dia., Cladding Materials (VPFS8C)
4. 90500
Valve Block with Release Lever & Guard
5. 51506
Valve Guard
6.
Air Filter* **
7. 10002
Screw, 1/4-20 x 1/2"
8.
Check Ball*
9.
O-Ring*
10. 10008
Screw, 10-32 x 3/8"
11.
Red Line
12. 90151AM Handle / Valve Assembly, Industrial Plastic
13. 90154AM Plunger Assembly, Industrial Plastic
14.
Check Valve Retainer**
15.
Check Valve**
16.
Valve Release Lever
Not Shown
29330
Case, Yellow, 8" [20 cm]
29334
Case, Black, 8" [20 cm]
* Repair Kit 90504 for Metal Cups (6, 8, 9 and Plunger Lube)
** Repair Kit 90160 for Industrial Plastic Cups (6, 14, 15 and Plunger Lube)
P.O. Box 368 · 908 West Main | Laurel, MT 59044 U.S.A. | Toll Free: 1-800-548-7341 Phone: 1-406-628-8231 Fax: 1-406-628-8354
