Comprehensive Power/Speed Adjustments - Page 2 - Polaris Brutus Forum
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post #11 of 14 (permalink) Old 04-19-2017, 09:09 PM Thread Starter
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The picture got lost, tube and puller.
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post #12 of 14 (permalink) Old 04-21-2017, 12:07 AM Thread Starter
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Max Engine RPMs now set to 4000 with PTO throttle, that's a .5 % increase over spec max, so no biggie there. Still trying to get that with the treadle pedal, now seeing 3750-3800 depending on grade. Top Speed in high almost 35 mph. Pulling moderate grades at 27 mph. The Brutus is actually becoming fun to drive in High! Pulling significant grades in high at 20 mph and serious grades at 10 mph as well all in high! There is more to get with the treadle cable and I am on that next. More Engine rpm produces more pump flow, more flow produces more trans motor speed and we will be trans motor soon.
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post #13 of 14 (permalink) Old 04-24-2017, 06:11 AM Thread Starter
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The forward throttle cable travel is to short and will not travel far enough at this point to realize engine output improvements at the treadle pedal. Please see throttle cable thread for more.
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post #14 of 14 (permalink) Old 05-19-2017, 08:21 AM
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Originally Posted by GhostRider View Post
First things first, make sure your idle lever has at least spec low idle and high idle, 1200-1300rpm and 3700-3800rpm. My engine throttle without cable was set at the factory 1250 and 3750rpm. The idle lever cable failed to deliver the high idle of the engine. This problem requires trying different throttle holes and tweaking the cable mount so the idle lever has the full range from high to low.

Next step is to make the pump squash plate adjustment. This should be made at high idle on jack stands with the squash plate just moving the wheels forward then back slowly until they stop. This adjustment is described in detail elsewhere on the site.

Now make sure the treadle pedal cables are adjusted for the correct free play and the wheels do not move in high idle. While still on the jack stands in high gear the treadle pedal should achieve about 30mph fully depressed forward and about 8mph fully depressed reverse, if not make those adjustments.

Now off the jack stands the HP Commander are made as per the Bobcat Dealer.

FORWARD TRAVEL RPM CHECK (PERFORM LOADED FOR CAB VEHICLES, UNLOADED FOR NON-CAB):
This check verifies the horsepower management system is functional and adjusted correctly for optimal performance. The command torsion spring bolt can be adjusted in quarter increments beyond the baseline setting below to match personal preference or based on accessory loads and vehicle usage.

1. With transmission in HIGH range on level asphalt depress the travel control pedal to the full forward position with a quick fluid motion.
2. The engine RPM at 20 mph (32.2 km/h) should be in the range of 3400-3600 RPM for loaded testing and 3550-3650 RPM for unloaded testing. If engine RPM is not within specifications proceed to steps 3-6. If the horsepower management functionality is within specification, proceed to the FORWARD TRAVEL SPEED CHECK
3. To decrease the engine RPM (increased engine pull down), loosen the command torsion spring bolt nut (Fig.1 Item 6) and tighten command torsion spring bolt (Fig.1 Item 5) シ turn.
4. To increase the engine RPM (decreased engine pull down), loosen the command torsion spring bolt nut (Fig.1 Item 6) loosen command torsion spring bolt (Fig.1 Item 5) シ turn. Note: This setting can be adjusted to match user preference, if desired. Tightening the spring will result in increased engine pull down/lug and may require more modulation of the travel control pedal when under load. Loosening the spring decrease engine pull down/lug under load.
5. Repeat steps 3 - 5 until the RPM is within specification. If Forward Travel RPM is within specifications proceed to FORWARD TRAVEL SPEED CHECK.
FORWARD TRAVEL SPEED CHECK (PERFORM LOADED FOR CAB VEHICLES, UNLOADED FOR NON-CAB):

This check verifies the horsepower management system is functional and adjusted correctly for optimal performance with a full accessory load. The command torsion spring bolt can be adjusted in half turn increments beyond the baseline setting below to match personal preference or based on accessory loads and vehicle usage. On straight, level asphalt or concrete, mark off a distance of 250 feet (76.2 meters) for non-CAB/HVAC models and 300 feet (91.44 meters) for CAB/HVAC models.

1. With transmission in HIGH range depress the travel control pedal to the full forward position with a quick fluid motion. Vehicles equipped with CAB/HVAC should accelerate from 0-20 mph (0-32 kph) in a distance of 300 feet (91.44 meters) and vehicles without CAB/HVAC in 250 feet (76.2 meters) or less. Perform test in both directions across the testing field and average the speeds. If vehicle does not obtain the desired speed in the specified distance proceed to Step 2. If vehicle obtains the desired speed in the specified distance the performance checks procedure is COMPLETE. Reconnect hydraulic temperature sensor and clear DTC with Digital Wrench.
2. Tighten command lever torsion spring bolt シ turn to increase speed. NOTE: If the vehicle does not meet performance specifications after three complete tests contact Bobcat or Polaris Service Troubleshooting for further assistance.

Sorry this is so long, but this is a very difficult process and is why so many problems occur.
Thanks for sharing.
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