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General Information
Coring Head Operation
The coring head of the Procore 648 consists of a frame
that pivots for aerating depth control, a coring crank-
shaft, stomper arms with rotolinks to provide vertical tine
motion, turf holders, tine holders and aerating tines.
Drive for the coring head comes from the engine
mounted electric clutch through a primary and secon-
dary drive belt. The primary drive belt drives a jackshaft
which in turn drives the coring crankshaft with the secon-
dary drive belt. Each of these drive belts is tensioned by
a spring loaded idler pulley.
The coring crankshaft is composed of multiple crank-
arms, bearings, bearing housings and couplings. For
assembly purposes, proper component position is iden-
tified by alignment marks on bearing housings and num-
bers cast into crankarms. Crankshaft journals are timed
to ensure minimal vibration.
Aerating depth control is based on tine choice and han-
dled automatically by the TrueCore
TM
ground following
system. Manual depth control aeration can be per-
formed by turning the TrueCore
TM
System off and ad-
justing the coring head manual spacers to obtain the
desired aerating depth (1/2” increments).
Turf holders are used to prevent damage to the turf as
the tines are lifted from the ground. Turf holders also
provide inputs for the TrueCore
TM
ground following sys-
tem.
A variety of tines, tine heads and turf holders are avail-
able for use on the ProCore 648. See the Operator’s
Manual for available options.
Figure 1
Coring Crankshaft
The coring crankshaft assembly is composed of six (6)
crankarms. One of the crankarms is incorporated into
the crankshaft pulley. The crankarms need to be timed
for proper aerating operation. For assembly purposes,
crankshaft positions are identified as #1 through #6. The
#1 position is on the right (pulley) side of the crankshaft
(Fig. 2). The crankshaft position is cast into the
crankarms to assist in correct crankshaft assembly.
The crankshaft assembly is supported with three identi-
cal bearing housing assemblies. The six stomper arms
and rotolink dampers used on the ProCore 648 are the
same for all positions.
Figure 2
1
2
1. #1 position 2. #6 position
Coring Head Page 7 – 2 ProCore 648