crond: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/sbin/crond - from package: cronie

You may install the required package with command yum install {package}

Error in other languages:
crond: bevel nie gevind nie
crond: comandă negăsită
crond: comando não encontrado
crond: commande introuvable
crond: command not found
crond: käsku ei ole
crond: không tìm thấy lệnh
crond: komanda nerasta
crond: Kommando nicht gefunden.
crond: kommandot finns inte
crond: komut yok
crond: nie znaleziono polecenia
crond: níor aimsíodh an t-ordú
crond: no se encontró la orden
crond: no s'ha trobat l'ordre
crond: opdracht niet gevonden
crond: parancs nem található
crond: perintah tidak ditemukan
crond: príkaz nenájdený
crond: příkaz nenalezen
crond: команда не найдена
crond: командата не е открита
crond: 命令找不到
crond: コマンドが見つかりません