Winch Service; Winch Friction Device - JUNTTAN PM 20L Operator's Manual

JUNTTAN
Routine service section

7.13 WINCH SERVICE

Junttan PM 20 is equipped with two winches in the rear of the machinery deck. The
right winch is used for the hammer and the left one is used to lift the pile. The leader
winch is for the rotary head. These winches have radial piston hydraulic motors.
All winches can be driven in both directions. Each winch has a brake. Operation of the
brake is automatic. The brake opens with the pressure in the winch pressure line when
the winches are operated. The brake also opens during hammer operation with hammer
circuit pressure. This allows the drums to unwind the necessary amount of rope as the
pile penetrates into the ground and the hammer follows it. See winch brakes function
during piling operation, chapter daily operation.

7.13.1 WINCH FRICTION DEVICE

Winches are equipped with friction device. The purpose of the friction device is to slow
down the rotation of drum. It is important, when the ground is soft and the pile can sink
fast. Adjust the brake lumps with adjusting screws. Check the brake lumps weekly and
change when needed.
Friction device
127