J&M 220 Operating And Maintenance Manual - page 19
MODEL 220
HYDRAULIC
IMPACT HAMMER
II.
PREPARATION FOR OPERATION
E. ATTACHMENT OF LEAD GUIDES
The hammer is usually shipped with lead or spud guides already in place. If they
are not attached, bolt them into place at the sides of the hammer using the twenty
bolt holes provided on each side of the hammer.
With fixed leads, it is sometimes convenient to stand the hammer in the leads prior
to attachment of the back lead guides.
The lead guide attachment bolts should be properly torqued, using the lock washers
provided, to prevent their coming loose. Torque 1.25-7UNC SHCS to 1,600 Ft-lbs
(221.1 Kg-M).
Do not weld on hammer.
F. ATTACHMENT OF DRIVE CAP (See Fig. 3)
To attach drive cap: Set drive cap insert [11] on dunnage or firm ground. Set drive
cap base [4] (DCB-2 for 32" leads) onto drive cap insert. Attach with wire rope
through two holes provided.
Place 2"(50mm) thick and 22 1/2”(571mm) diameter cushion material [8] into top of
DCB-1 drive cap base (2”(50mm) thick and 25”(635mm) diameter for DCB-2 drive
cap base). Place 1/2”(13mm) thick aluminum plate [7] on top of cushion material.
This plate holds the cushion material in place if it fractures during driving.
Place the 9 1/2” (243mm) thick tapered steel striker block [3] on top of the
aluminum plate
Place the recoil dampener [9] around the top of the striker block.
Set the hammer onto the assembled drive cap set-up. The tapered striker block fits
inside the bottom of the hammer and will lift the ram [1] as the hammer is lowered
onto it. The hammer base plate [2] should sit squarely on the recoil dampener.
Attach the drive cap to the hammer with 3/4”(19mm) wire rope [10]. Insert bolt [6]
through the holes in the cable ears on hammer base plate [2] to keep the
3/4”(19mm) wire rope [10] in place. Secure bolt [6] with the locking nut provided
and fully tighten. Provide enough slack in the wire rope so that, when the hammer
is lifted, 1”-2” (25-50mm) of space should exist between the bottom of the hammer
and the recoil dampener.
II-6