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Generally - you may not stop payment - I suggest to get another loan for funding and still continue regular payments.
If you will not be able to make regular payments back to the administrator of your pension plan - the balance outstanding will be deemed a distribution and will be your taxable income.
You may contact the administrator for how late you may do you payments - however if you past the deadline - the administrator will issue the reporting form 1099-R to you and to the IRS reporting the balance outstanding as distribution.
To verify your current situation - please contact the administrator of your pension plan.