The payrolls prepared by the Director of Finance shall be examined by the Personnel Director, who shall approve those on which the employees named thereon have been legally appointed and are shown thereon by proper class titles and approved rates of pay. The payroll shall then be finally approved by the City Manager, and the Director of Finance shall prepare, sign and deliver checks for the amounts shown to the employees named. It shall not be necessary to encumber payrolls before payment or to certify to the availability of funds appropriated for personal services, except those obtained on a contractual basis.