Relief Valve Check And Adjustment Procedure; Tool Setup; Ram 1 - Greenlee LPK1240 Service Manual

Relief Valve Check and Adjustment Procedure

1. Use one of these methods for checking the setting
of the relief valve:
• Purchase a Greenlee 35887 Load Cell. Refer to
the instructions supplied with the load cell. The
proper relief pressure is within the 12-ton range
indicated on the gauge.
• Install an in-line pressure gauge at the tool's input.
With dies in place, perform a test crimp. The
proper relief pressure range is 103 bar to 107 bar
(1500 psi to 1550 psi).

Tool Setup

This tool can be used on either open-center or
closed-center hydraulic systems.
Open-Center Setting
1. With the ram retracted, disconnect the crimping tool
from the hydraulic power source.
2. Loosen the two seal nuts. Back each seal nut out to
the end of the screw.
3. Turn the screws clockwise — evenly, alternating
every one to two turns — until they contact the
piston and feel snug.
4. Back the screws out — evenly, alternating every one
to two turns — exactly four complete turns.
5. Hold the screws in place with an Allen wrench and
tighten the seal nuts against the cover. Torque the
seal nuts to 6.78 newton-meters (5 foot-pounds).
Greenlee / A Textron Company
LPK1240 Hydraulic Crimping Tool
2. To change the setting, remove the cap (50) and
rotate the set screw (48):
• clockwise to increase the relief pressure
• counterclockwise to decrease the relief pressure
Note: The copper washer (49) may fall free when
the cap (50) is removed.
3. Install the copper washer (49) and cap (50). Without
changing the setting of the set screw (48), tighten
the cap.
4. Perform three more test crimps to be sure that the
relief valve setting was not disturbed during Step 3.
Closed-Center Setting
1. Disconnect the crimping tool from the hydraulic
power source.
2. Loosen the two seal nuts.
3. Turn the screws counterclockwise — evenly, alter-
nating every one to two turns — until they contact
the stops.
4. Hold the screws in place with an Allen wrench and
tighten the seal nuts against the cover. Torque the
seal nuts to 6.78 newton-meters (5 foot-pounds).
Adjusting
Screw
Installing Dies
1. Clean the die seat area.
2. Install the proper size and type of crimping dies.
Seal Nut
5
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Adjusting
Screw
Seal Nut