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Danfoss  T-420 Crimp machine operator´s manual  December 2022

Table of contents

1.  PREVENT UNAUTHORIZED 

OPERATION. Do not permit 

anyone to operate this 

equipment unless they 

have read and thoroughly 

understood this manual.

2. WEAR SAFETY GLASSES.
3. AVOID PINCH POINTS. Do 

not rest your hand on the 

crimp ring. Keep your hands 

clear of all moving parts. 

Do not allow anyone, other 

than the operator, close to 

the equipment while it is in 

operation.

4. MAINTAIN DIES WITH CARE. 

Dies used in the T-420 crimp 

machine are hardened 

steel, offering the best 

combination of strength 

and wear resistance for 

long life. Hardened dies are 

generally brittle and care 

should be taken to avoid 

any sharp impact. Never 

strike a die with a hardened 

instrument.

5. USE ONLY SPECIFIED 

DANFOSS PRODUCTS.  

Make hose assemblies using 

only Danfoss's  hose and 

Danfoss fittings specified for 

this assembly equipment. 

6. VERIFY CORRECT CRIMP 

DIAMETERS. Check and 

verify correct crimp 

diameters of all fittings after 

crimping. Do not put any 

hose  assemblies  into  service     

if the crimp diameters do 

not meet Danfoss crimp 

specifications.

7. MAKE SURE ALL DIES ARE 

COMPLETELY IN PLACE, 

the spacer ring rests against 

the locator bracket, and the 

pusher halves are closed 

before crimping.

8. DO NOT OVER PRESSURIZE. 

Do not exceed the 5,000 psi 

hydraulic pressure supplied 

to the machine

9.  DIE CHANGE. DO NOT 

INSERT/REMOVE DIES 

WHILE THE POWER IS 

ON OR MACHINE IS IN 

OPERATION.

10. SECURE THE EQUIPMENT 

TO A STABLE WORK 

SURFACE. Prior to 

operation, secure the 

crimp machine to a stable 

work surface to prevent 

the equipment from 

tipping. See pages 4-5 for 

mounting instructions.

11. UNPLUG THE POWER 

SUPPLY WHEN NOT IN 

USE.

12. KEEP WORK AREA CLEAN. 

Cluttered areas and 

benches invite accidents.

13. DO NOT OPERATE 

WITHOUT THE BASE 

ADAPTER RING IN PLACE.

Safety instructions

T-420 Crimp machine

WARNING 

Danfoss's hose and Danfoss hose fittings should only be assembled using 
Danfoss approved assembly equipment. Do not use any combinations 
of Danfoss's hose, Danfoss hose fittings, or Danfoss assembly equipment 
with hose, hose fittings, or assembly equipment supplied by another 
manufacturer. 
Danfoss hereby disclaims any obligation or liability (including incidental 
and consequential damages) arising from breach of contract, warranty, 
or tort (under negligence or strict liability theories) should Danfoss hose, 
Danfoss hose fittings, or Danfoss assembly equipment be used with 
any hose, hose fittings, or assembly equipment supplied by another 
manufacturer, or in the event that product instructions for each specified 
hose assembly are not followed. (Reference SAE J1273 – Recommended 
practice for hydraulic hose assemblies).

WARNING 

Failure to follow Danfoss processes and product instructions and 
limitations could lead to premature hose assembly failures, resulting in 
property damage, serious injury, or death. 
Danfoss fitting tolerances are engineering to match Danfoss's hose 
tolerances. The combination or use of Danfoss's hose and hose fittings 
supplier by another manufacturer may result in the production of 
unreliable and/or unsafe hose assemblies and is neither recommended 
nor authorized by Danfoss.  

Read and understand the operator’s manual before  

attempting to operate any equipment. 

Section  

Page

Safety instructions      

2

Specifications and equipment                   

 

3

T-420 Crimp machine 

3

Power source options 

3

Mounting instructions

 

4 - 5

Check-out procedure 

6

Operating instructions  

7-8

Adapter rings 

 

8

Spacer ring and nominal crimp diameter measurement 

8

Troubleshooting procedures                                                                                                       

9-10

Repair and replacement items 

11

Summary of Contents for T-420

Page 1: ......

Page 2: ...P WORK AREA CLEAN Cluttered areas and benches invite accidents 13 DO NOT OPERATE WITHOUT THE BASE ADAPTER RING IN PLACE Safety instructions T 420 Crimp machine WARNING Danfoss s hose and Danfoss hose...

Page 3: ...amp fused circuit Pump wired for 220 volts single phase T 421U 110 Electric pump 110 volt For dimensional data other than voltage information refer to T 421U see above T 421U 110CSA CSA approved Note...

Page 4: ...4 The T 421U Electric Pump mounts on the right side of the cabinet Predrilled holes align the pump Insert bolts through top of cabinet Washers and nuts are installed from underneath Tighten STEP 5 Rem...

Page 5: ...1U power unit on mounting surface to the right and slightly behind the T 420 1 press 5 Mark mounting hole location for power unit and drill holes in mounting surface 6 Replace power unit and align hol...

Page 6: ...power cord into 220 volt 60 cycle single phase outlet It is recommended that the pump be on an individual 15 amp fused electrical circuit If using T 421U 110 pump plug power cord into 110 volt 60 cycl...

Page 7: ...t and pusher halves will open Remove factory quality crimped hose assembly and visually inspect 6 To ensure a proper crimp has been completed measure the nominal crimp diameter as shown in figure on p...

Page 8: ...mped portion of the hose end 2 Place the caliper in a position to allow for a measurement across the pressed flat portion of the crimp 3 See crimp diameters in crimp specifications Maintenance Collet...

Page 9: ...rom bottoming Remove 3 8 NPTF plug from port above check valve and install 6000 PSI pressure gauge With 6000 PSI pressure gauge in place operate unit to full crimping position Gauge should read 4000 4...

Page 10: ...crimp pressure blows fuse Pump unload valve stuck shut Replace pump Motor runs Pusher advances but doesn t develop final crimp pressure Relief valve leaking Shuttle valve leaking Relief valve set low...

Page 11: ...lb T 420 LA Light assembly T 420 LS Light switch T 420 P Pusher set 2 with wear plates and screws T 420 S Press shroud with decals T 420 26 Insert base plate T 420 G Linkage assembly T 420 2R Rack T 4...

Page 12: ...y on orderprovided that such alterations can be made without subsequent changes being necessary in specifications already agreed All trademarks in this material are property of the respective companie...

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