I own an ASV track loader(SR80) but my neighbor is having problems with his newer, CAT 277C . Trying to help him; he has problems understanding but I have never used it. He has owned and used it successfully for a year since buying it used. In pretty nice condition. . . . just had him demo how his problem shows up as symptoms, which are: -- He has been used to starting it up and using only joystick pattern #1(Cat default logic), then pressing the Parking brake button to release the machine and start usage. Normally, after doing so he simply starts using the machine as required. -- However, today he finds that, out of the blue, after NORMAL start up(select #1, deselect Park) the machine is locked in place or runs intermittently, wonky. . . not right, whatever. -- He told me he does NOT have to put BOTH armrests down. However, reading his manual home alone tonight it appears to state BOTH must be down. -- I started up the machine tonight and watched him do so also. It appears the "1 /2" joystick pattern selector toggle switch is intermittent and possibly faulty. Pushing it multiple times on the left and right finally pulls it out of the blinking mode and one or the other(1 or 2) engages. However, once engaged still, nothing works / moves or if so, not correctly or as expected. -- a yellow warning triangle appears with ! in the center. But, no way to understand what is wrong. . .? some questions: 1) Do I understand the operator manual correctly that BOTH arm rests must be down or it will lock into Park? 2) What are your thoughts on the joystick pattern switch symptom and do you have other better targets for the apparent fault? 3) What is process for removing the toggle switches from the panel face? 4) it does not appear the seat belt is locking things out. . . 5) Are there OTHER failsafe / lockouts that could be causing this inability to move and use the machine after it is running? 6) ways to find out what the triangle ! is alerting to? THANKS for your time!
I'll let other people go more into the operation comment but if you want to dive down the rabbit hole of tracing electrical faults and need a schematic post a Serial Number. This would also identify the Part Numbers of any switches that might need to be replaced. The arm bar switch is under the left armrest so it is logical that provided that one is down the other one doesn't have to be. All that the manual says is "lower the armrests", not "both armrests must be down before you can operate the machine". There is a pressure switch in the bottom seat cushion wired in series with the arm bar switch. Unless both switches are functioning correctly the required signal to unlock the propulsion side of the machine will not reach the ECM. Switches should prise out of the panel (they are held by spring-loaded plastic locks) but you have to do it carefully. Does the RH instrument panel have one gauge or two.? If it has two then it's possible to get into the diagnostics using that panel. That would help find out what Diagnostic Code(s) are causing the Driver Alert to flash.
Excellent, thanks Nige. I will get his ser# and return with more info. It appears jumping the two switches is a good first try. . .
Sorry you can't do that. The armrest switch is not a simple open/closed switch. It has a connection to ground and two connections to the ECM. For the ECM to correctly register the status of the switch it MUST see ground on one wire and open circuit on the other otherwise it will register a Diagnostic Code. That's why you need an electrical schematic, and to identify the correct one needs a Serial Number. Ask him the question about how many gauges on the RH panel and cross your fingers he says "two", because if he does you can use that panel to get into the Diagnostics menu.
OK, waiting on the image of rt. panel. Ser# 0277CLJWF02647 The two zeros show up to look like they could be 8's, basically zero's with horizontal line through centers. I'm sure someone at CAT thought they would "help" by doing this. . .?!# thanks again, for the electrical diagram. appending as a file or image? file would be fantastic!
Definitely zeros. See the example below. The difference between a 0 and an 8 is obvious. I'll send you a schematic. Keep an eye on your messages.