[array]$servers= Get-SPServer | ? {$_.Role -eq "Application"}

$farm = Get-SPFarm

foreach ($server in $servers)

{

    Write-Host "Restarting Timer Job on $server"

    $Service = Get-WmiObject -Computer $server.name Win32_Service -Filter "Name='SPTimerV4'"

    if ($Service -ne $null)

    {

        $Service.InvokeMethod('StopService',$null)

        Start-Sleep -s 7

        $service.InvokeMethod('StartService',$null)

        Start-Sleep -s 7

        Write-Host "Timer Job successfully restarted on $server"

    }

    else

    {

        write-host -ForegroundColor Yellow "Could not find SharePoint 2010 Timer Service on $server"

    }

}