You are fortunate to have a well-run residents’ association, and a chairperson who is doing a good job. You can view minutes of past meetings in the Minute Book. All residents’ associations must have a minute book into which the minutes are entered.
If the chair of the residents’ association believes the administrator is doing a good job then perhaps it is best to stick with him. The administrator (who is an employee, so to speak, of the residents) has the duty to keep the accounts, deal with payments in and out, pay salaries to gardeners, security men etc. (if any), prepare the balance sheet and details of budgeted expenditure of the AGM, and work on the chair’s instructions. If, for example, minor repairs are required, it is the chair’s duty to instruct the administrator accordingly to in turn locate a firm or person to do these jobs.
If the administrator comes to your complex once a week then that is the time to approach him or her with any questions or concerns you may have. I daresay there are not that many administrators who do speak English.
Ultimately, the procedure is to write (not just speak) to the chairperson and/or the committee members with any concerns you may have. The administrator cannot act without the chairperson’s or the committee’s instructions or approval.
If you feel you want the administrator removed then start by putting this request in writing to the chair. The matter can then be included in the agenda of business for the next AGM, if the chair thinks this would be appropriate, and will be decided by a vote.