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MAINTENANCE
TIMBER CAT HEAD
Lubrication/Daily Checks (Figure Mnt-0007)
Lubricate the grease fittings on top of the blade bar
every 4 hours. See Figure Mnt-0007.
Every 8 hou rs, lubr icate the cylinder gre ase fittin g
through the top slot in the cover. See Figure Mnt-
0007. Ever y 8 ho urs, che ck all b olts an d nu ts fo r
proper tightne ss. T ighten an y b olt or nu t fo und to
be loose. Pe riodically check the hydraulic connec-
tions for oil leaks. V isually inspect the hos es for
damage a nd r eplace as necessary. Pe riodically
inspect bla de str oke adju stment by ru nning th e
head a t normal op erating speed ( 540 PT O) an d
checking t hat the u pper and lower b lades lin e-up
perfectly the instant of reversal (when they change
direction).
Improper adjustment is also indicated by an abnormally high shock load on the hydraulic system during blade
reversal. This is due to the h ydraulic cylinder reaching its stroke limit, causing the p ressure relief reversing
components to engage. Contin uous operation in this mode will result in oil over heating and premature failure
of components. If the unit is improperly adjusted, follow the stroke adjustment procedures below.
Stroke Adjustment (Figure Mnt-0008)
Position the head in a safe a rea for op eration. If
necessary, b arricade the head t o p revent c ontact
while it is being operated.
Remove the cover a nd loosen the two jam nuts
(Item 1 ). See Figure Mnt-0008. Screw the two
spring bolt assemblies (Item 2) in toward the valve
push buttons. Start the unit and bring the speed up
to normal operating speed ( 540 PT O). Ch eck the
blade over lap. Adjust the spring b olt a ssemblies
(Item 2) , o ne b y o ne u ntil th e up per an d lowe r
blades p erfectly align in the in stant of re versal.
Never adjus t the bolt as semblies to a point where
the hydraulic c ylinder r eaches it 's st roke limi t! This is indic ated by an abnormally h igh sho ck load on th e
hydraulic system due to the pressure relief reversing components being engaged. Continuous operation in this
mode will cause premature component failure and hydraulic oil overheat. Once proper adjus tment has been
achieved, tighten the jam nuts (Item 1) and replace cover.
ABOOM 03/09
Maintenance Section 4-10
©2009 Alamo Group Inc.
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