425HD-MD INITIAL SETUP
Hydraulic Pump Belts
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3-10 425HD-MD/masterdoc101602 425HD-MD INITIAL SETUP
3.12 Hydraulic Pump Belts
The hydraulic pump drive belts are located under the operator seat pan, between the
engine main drive pulley and the hydraulic pumps both to the left and right of the engine.
Each pump mount pivots away from the engine at the frame above the pump. The tension
springs located under each pump tensions the belts to the proper level.
Check the belts for visible wear or damage. If either belt appears excessively worn, dam-
aged, cracked, weathered, or otherwise appears to pose an unsuitable or unsafe operat-
ing condition, replace the belt.
Check the belt for proper tension. When the belt is properly tensioned, the pump should
orient roughly square to the frame. If, in order to adequately tension the belt, the pump
pivots excessively past square, or comes into contact with any peripheral apparatus, you
need to replace the belt. If the belt you are checking is new, and the pump pivots exces-
sively past square, or comes into contact with any peripheral apparatus, it is likely you
have installed the wrong size belt. Contact your LasTec dealer for the proper belt lengths
for your Articulator.
If you are unable to install a new belt with the pump pivoted to its closest proximity to the
engine drive pulley, it is likely you are installing the wrong size belt. Contact your LasTec
dealer for proper belt lengths for your Articulator.
Be sure that each pump tensioning spring is properly installed and in good condition. If for
some reason this spring becomes loose, detached, or fatigued, the pump mount will not
properly tension the belt.
NEVER inspect, adjust, or change the hydraulic pump belts while the
engine is running!
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