In general, parolees don't have a right to counsel at parole revocation hearings. Some states actually have laws providing this right, but in others the parolee is relegated to asking for appointment of counsel. In the latter states, discretion is involved in appointing counsel on a case-by-case basis, although the circumstances may require appointment. Appointed counsel is more likely when facts are seriously disputed or involve complex documentary evidence, or when a parolee isn't capable of self-representation because of language or mental deficiencies.
For more on the right to counsel, see Court-Appointed Attorneys in Criminal Cases.