Enerpac EFBE5017, Instruction Sheet

15

3. Disconnect the cutter from the AC power supply to 

prevent accidental motor start-up during the following 

steps.

4. Place the cutter in an upright position, on a stable and 

level work surface, with the handle facing upwards. 

Place a pan or suitable container under the cutter to 

catch any spilled oil.

5. To prevent contamination, remove any built-up dust 

and dirt from the oil reservoir cap, diaphragm cover, 

and surrounding area. 

NOTICE

When the handle is removed the wires from the 

trigger on-off switch will still be connected to the electric 

motor. Take care not to pull or stretch the wires when 

removing the handle or when performing the oil change 

procedure.
6. Remove the screws holding the tool handle in place.  

Carefully remove the tool handle to gain access to the 

diaphragm cover. The tool handle wiring will still be 

connected, so use caution to avoid damaging this 

wiring.

NOTICE

A small amount of hydraulic oil leakage may 

occur when the diaphragm cover is removed in the next 

step. Be prepared to catch this oil in a pan or with a 

clean rag. Dispose of spilled oil in accordance with all 

applicable laws and regulations.
7. Remove the diaphragm cover by removing the six 

screws securing it.

8. Remove the diaphragm from the diaphragm opening. 
9. Completely drain all old oil from the cutter through the 

diaphragm opening, turning it upside down and using 

a suitable oil extraction system (used oil extraction 

pump) if necessary, so that no oil remains in the cutter 

reservoir. 

NOTICE

Dispose of all used oil in accordance with all 

applicable regulations and laws. 
10.  After all oil is evacuated, position the cutter with the 

diaphragm opening facing up.

NOTICE

Use only new Enerpac HF oil in the following 

step. Use of other oils may damage the cutter and may 

invalidate the Enerpac product warranty.
11.  Using the oil dispenser prepared in step 1, slowly 

add new Enerpac HF oil through the diaphragm 

opening until the diaphragm opening is nearly full. 

NOTICE:

  WARNING

To avoid serious personal injury, stay 

clear of cutting head and blades during the following 

procedures. Wear rubber gloves to prevent contact 

with oil. Wear eye and face protection to avoid injury 

due to splashing oil.

NOTICE:

  WARNING

In the following steps, the tool must be 

operated with the handle separated from the tool 

housing. Use extreme caution to prevent injury as 

service procedures are being performed.

12.  Connect the cutter to the AC power supply.

13.  Cover the diaphragm opening with a rubber-gloved 

hand to help prevent oil splashing.

14. Prime the pump by pressing and releasing the 

trigger in short bursts. During this process, check 

the oil level in the diaphragm opening and add oil 

(as needed) to keep the reservoir filled. Failure to 

keep reservoir full may result in cavitation and 

pump failure. Pump is primed when piston starts 

extending.

NOTICE

During priming, the oil may become entrained 

with air and may develop a foamy appearance. This is 

normal.
15.  Continue pressing and releasing the trigger in short 

bursts as the piston extends. During this part of the 

process, do not add oil, but verify that the pump has 

ample oil supply. Continue until piston is extended 

to approximately half stroke.

NOTICE

During the following steps, refer to Figure 5 for 

piston release lever positions.
16. While covering the diaphragm opening with a 

rubber-gloved hand, retract the piston gently by 

slowly moving the piston release lever to position 2.

17.  Move the piston release lever back to position 1 and 

tighten.

18.  Place the soft metal bar (refer to step 2) into the 

cutting head. 

19.  Press and release the trigger in short bursts until 

the piston is extended as far as possible, but before 

it makes a full cut and retracts. The moving blade 

will become lodged in the bar, preventing the 

piston from retracting. This procedure is necessary 

because the cutter mechanism alone may fail to 

hold the piston in the partially extended position as 

oil is being added in the following steps. 

NOTICE

If you cut completely through the bar, try again, 

cutting as far as you can without making a full cut.
20.  Disconnect the cutter from the AC power supply 

to prevent accidental motor start-up during the 

following steps.

21. Add oil through the diaphragm opening until the 

diaphragm opening is nearly full.

22. Slowly install the diaphragm in the diaphragm 

opening. This should result in some oil leakage from 

around the diaphragm.

23.  Install the diaphragm cover and securely tighten the 

six screws securing it.

24.  Reinstall the tool handle. Be certain that electrical 

wires are not pinched between tool housing and 

handle.

25.  Move the piston release lever to position 2 to retract 

the piston. If piston is stuck, use the bar to manually 

push the piston back until it retracts.

26.  Remove the soft metal bar from the cutting head. 

Do not discard the bar. It will be used again later in 

this procedure.