JLG 642 Operation & Safety Manual page 105

Hydraulic Coupler
This installation procedure is designed for one-person operation.
1
1. Tilt coupler back to provide clearance.
2. Align attachment pin with recess in attachment. Raise boom slightly to engage
attachment pin in recess.
3. Check to be sure lock pin is disengaged. Tilt coupler forward to engage attachment.
4. Press and hold the coupler switch (3) on left control panel. At the same time, press
roller switch (4) up to engage lock pin. Press roller switch (4) down to disengage lock
pin.
5. Raise boom to eye level and visually check that lock pins protrude through holes on
both sides of coupler. If lock pins do not protrude through holes, place attachment
on ground and return to step 2.
6. If attachment is equipped, connect auxiliary hydraulic hoses. See "Hydraulic Operated
Attachment" on page 5-12.
7. If equipped, connect auxiliary electric harness.
31211031
OD0600
OD0630
DISENGAGED ENGAGED
2
OD0610
3
OD0340
Section 5—Attachments
3
4
OD0670
OD0620
5-11