Alamo 7191852C - Manual (Page 44)

ASSEMBLY
PA91 03/09 Assembly Section 3-4
© 2009 Alamo Group Inc.
ASSEMBL
Y
Ballast Weight
Tractor must be stable while operating the hedge cutters under all conditions. Pay attention when operating on
slopes. Front end ballast as well as rear wheel weights to counterbalance the overhang of the flail head should
be added as appropriate. On steeply banked ground, it may not be sufficient to depend alone on the
counterweight provided by the oil reservoir.
In addition, rear wheel track should be set as wide as possible to increase stability. It will also increase the
protection to the reservoir.
JOHN DEERE CONVERSION KIT (81- 30- 059)
The John Deere utilizes a “closed center” hydraulic principle and because of this, it is recommended to use
trimmers with a fully independent hydraulic system on tractors of this manufacture. However, it is practicable
for the semi independent model of the PA91 to be used with these. Tractors subject to certain modifications.
There are the following two alternatives.
1. A flow limiting valve manufactured by John Deere is available to provide an “open center” external supply
sufficient for PA91 requirements. For further advice consult your John Deere dealer.
2. Components are available from F.W. McConnel Ltd. to convert the standard “open center” valve. Part No.
81-30-059 consists of a relief valve blanking plug which should be installed in place of existing relief valve. Be
careful when extracting the relief valve not to damage the copper sealing washer as it is reused with the
blanking plug. In addition, a pressure gallery blanking plug is installed in place of the standard blanking plug at
the valve outlet end next to the lift ram gland connection.
When working in this mode, the tractor’s pressure control valve must not exceed 1800 PSI (125 Bar).